# Change history {#changelog-5.5}

This document contains change notes for bugfix & new features in the
main branch & 5.5.x series, please see `whatsnew-5.5`{.interpreted-text
role="ref"} for an overview of what\'s new in Celery 5.5.

## 5.5.3 {#version-5.5.3}

release-date

:   2025-06-01

release-by

:   Tomer Nosrati

### What\'s Changed

-   make the tests run on python 3.13 for gcs backend (#9677)
-   Added DeepWiki to README (#9683)
-   Limit redis to \<=v5.2.1 to match Kombu (#9693)
-   Use EX_OK instead of literal zero (#9684)
-   Make wheel metadata reproducible (#9687)
-   let celery install from kombu dependencies for better align (#9696)
-   Fix stamping documentation to clarify stamped_headers key is
    optional in visitor methods (#9697)
-   Support apply_async without queue argument on quorum queues (#9686)
-   Updated rabbitmq doc about using quorum queues with task routes
    (#9707)
-   Add: Dumper Unit Test (#9711)
-   Add unit test for event.group_from (#9709)
-   refactor: add beat_cron_starting_deadline documentation warning
    (#9712)
-   fix: resolve issue #9569 by supporting distinct broker transport
    options for workers (#9695)
-   Fixes issue with retry callback arguments in DelayedDelivery (#9708)
-   get_exchange-unit-test (#9710)
-   ISSUE-9704: Update documentation of result_expires, filesystem
    backend is supported (#9716)
-   update to blacksmith ubuntu 24.04 (#9717)
-   Added unit tests for celery.utils.iso8601 (#9725)
-   Update introduction.rst docs (#9728)
-   Prepare for release: v5.5.3 (#9732)

## 5.5.2 {#version-5.5.2}

release-date

:   2025-04-25

release-by

:   Tomer Nosrati

### What\'s Changed

-   Fix calculating remaining time across DST changes (#9669)
-   Remove [setup_logger]{.title-ref} from COMPAT_MODULES (#9668)
-   Fix mongodb bullet and fix github links in contributions section
    (#9672)
-   Prepare for release: v5.5.2 (#9675)

## 5.5.1 {#version-5.5.1}

release-date

:   2025-04-08

release-by

:   Tomer Nosrati

### What\'s Changed

-   Fixed \"AttributeError: list object has no attribute strip\" with
    quorum queues and failover brokers (#9657)
-   Prepare for release: v5.5.1 (#9660)

## 5.5.0 {#version-5.5.0}

release-date

:   2025-03-31

release-by

:   Tomer Nosrati

Celery v5.5.0 is now available.

### Key Highlights

See `whatsnew-5.5`{.interpreted-text role="ref"} for a complete overview
or read the main highlights below.

#### Redis Broker Stability Improvements

Long-standing disconnection issues with the Redis broker have been
identified and resolved in Kombu 5.5.0, which is included with this
release. These improvements significantly enhance stability when using
Redis as a broker.

Additionally, the Redis backend now has better exception handling with
the new `exception_safe_to_retry` feature, which improves resilience
during temporary Redis connection issues. See
`conf-redis-result-backend`{.interpreted-text role="ref"} for complete
documentation.

Contributed by [\@drienkop](https://github.com/drienkop) in
[#9614](https://github.com/celery/celery/pull/9614).

#### `pycurl` replaced with `urllib3`

Replaced the `pycurl`{.interpreted-text role="pypi"} dependency with
`urllib3`{.interpreted-text role="pypi"}.

We\'re monitoring the performance impact of this change and welcome
feedback from users who notice any significant differences in their
environments.

Contributed by [\@spawn-guy](https://github.com/spawn-guy) in Kombu
[#2134](https://github.com/celery/kombu/pull/2134) and integrated in
Celery via [#9526](https://github.com/celery/celery/pull/9526).

#### RabbitMQ Quorum Queues Support

Added support for RabbitMQ\'s new [Quorum
Queues](https://www.rabbitmq.com/docs/quorum-queues) feature, including
compatibility with ETA tasks. This implementation has some limitations
compared to classic queues, so please refer to the documentation for
details.

[Native Delayed
Delivery](https://docs.particular.net/transports/rabbitmq/delayed-delivery)
is automatically enabled when quorum queues are detected to implement
the ETA mechanism.

See `using-quorum-queues`{.interpreted-text role="ref"} for complete
documentation.

Configuration options:

-   `broker_native_delayed_delivery_queue_type`{.interpreted-text
    role="setting"}: Specifies the queue type for delayed delivery
    (default: `quorum`)
-   `task_default_queue_type`{.interpreted-text role="setting"}: Sets
    the default queue type for tasks (default: `classic`)
-   `worker_detect_quorum_queues`{.interpreted-text role="setting"}:
    Controls automatic detection of quorum queues (default: `True`)

Contributed in [#9207](https://github.com/celery/celery/pull/9207),
[#9121](https://github.com/celery/celery/pull/9121), and
[#9599](https://github.com/celery/celery/pull/9599).

For details regarding the 404 errors, see [New Year\'s Security
Incident](https://github.com/celery/celery/discussions/9525).

#### Soft Shutdown Mechanism

Soft shutdown is a time limited warm shutdown, initiated just before the
cold shutdown. The worker will allow
`worker_soft_shutdown_timeout`{.interpreted-text role="setting"} seconds
for all currently executing tasks to finish before it terminates. If the
time limit is reached, the worker will initiate a cold shutdown and
cancel all currently executing tasks.

This feature is particularly valuable when using brokers with visibility
timeout mechanisms, such as Redis or SQS. It allows the worker enough
time to re-queue tasks that were not completed before exiting,
preventing task loss during worker shutdown.

See `worker-stopping`{.interpreted-text role="ref"} for complete
documentation on worker shutdown types.

Configuration options:

-   `worker_soft_shutdown_timeout`{.interpreted-text role="setting"}:
    Sets the duration in seconds for the soft shutdown period (default:
    `0.0`, disabled)
-   `worker_enable_soft_shutdown_on_idle`{.interpreted-text
    role="setting"}: Controls whether soft shutdown should be enabled
    even when the worker is idle (default: `False`)

Contributed by [\@Nusnus](https://github.com/Nusnus) in
[#9213](https://github.com/celery/celery/pull/9213),
[#9231](https://github.com/celery/celery/pull/9231), and
[#9238](https://github.com/celery/celery/pull/9238).

#### Pydantic Support

New native support for Pydantic models in tasks. This integration allows
you to leverage Pydantic\'s powerful data validation and serialization
capabilities directly in your Celery tasks.

Example usage:

``` python
from pydantic import BaseModel
from celery import Celery

app = Celery('tasks')

class ArgModel(BaseModel):
    value: int

class ReturnModel(BaseModel):
    value: str

@app.task(pydantic=True)
def x(arg: ArgModel) -> ReturnModel:
    # args/kwargs type hinted as Pydantic model will be converted
    assert isinstance(arg, ArgModel)

    # The returned model will be converted to a dict automatically
    return ReturnModel(value=f"example: {arg.value}")
```

See `task-pydantic`{.interpreted-text role="ref"} for complete
documentation.

Configuration options:

-   `pydantic=True`: Enables Pydantic integration for the task
-   `pydantic_strict=True/False`: Controls whether strict validation is
    enabled (default: `False`)
-   `pydantic_context={...}`: Provides additional context for validation
-   `pydantic_dump_kwargs={...}`: Customizes serialization behavior

Contributed by [\@mathiasertl](https://github.com/mathiasertl) in
[#9023](https://github.com/celery/celery/pull/9023),
[#9319](https://github.com/celery/celery/pull/9319), and
[#9393](https://github.com/celery/celery/pull/9393).

#### Google Pub/Sub Transport

New support for Google Cloud Pub/Sub as a message transport, expanding
Celery\'s cloud integration options.

See `broker-gcpubsub`{.interpreted-text role="ref"} for complete
documentation.

For the Google Pub/Sub support you have to install additional
dependencies:

``` console
$ pip install "celery[gcpubsub]"
```

Then configure your Celery application to use the Google Pub/Sub
transport:

``` python
broker_url = 'gcpubsub://projects/project-id'
```

Contributed by [\@haimjether](https://github.com/haimjether) in
[#9351](https://github.com/celery/celery/pull/9351).

#### Python 3.13 Support

Official support for Python 3.13. All core dependencies have been
updated to ensure compatibility, including Kombu and py-amqp.

This release maintains compatibility with Python 3.8 through 3.13, as
well as PyPy 3.10+.

Contributed by [\@Nusnus](https://github.com/Nusnus) in
[#9309](https://github.com/celery/celery/pull/9309) and
[#9350](https://github.com/celery/celery/pull/9350).

#### REMAP_SIGTERM Support

The \"REMAP_SIGTERM\" feature, previously undocumented, has been tested,
documented, and is now officially supported. This feature allows you to
remap the SIGTERM signal to SIGQUIT, enabling you to initiate a soft or
cold shutdown using TERM instead of QUIT.

This is particularly useful in containerized environments where SIGTERM
is the standard signal for graceful termination.

See
`Cold Shutdown documentation <worker-REMAP_SIGTERM>`{.interpreted-text
role="ref"} for more info.

To enable this feature, set the environment variable:

``` bash
export REMAP_SIGTERM="SIGQUIT"
```

Contributed by [\@Nusnus](https://github.com/Nusnus) in
[#9461](https://github.com/celery/celery/pull/9461).

#### Database Backend Improvements

New `create_tables_at_setup` option for the database backend. This
option controls when database tables are created, allowing for non-lazy
table creation.

By default (`create_tables_at_setup=True`), tables are created during
backend initialization. Setting this to `False` defers table creation
until they are actually needed, which can be useful in certain
deployment scenarios where you want more control over database schema
management.

See `conf-database-result-backend`{.interpreted-text role="ref"} for
complete documentation.

Configuration:

``` python
app.conf.result_backend = 'db+sqlite:///results.db'
app.conf.database_create_tables_at_setup = False
```

Contributed by [\@MarcBresson](https://github.com/MarcBresson) in
[#9228](https://github.com/celery/celery/pull/9228).

### What\'s Changed

-   (docs): use correct version celery v.5.4.x (#8975)
-   Update mypy to 1.10.0 (#8977)
-   Limit pymongo\<4.7 when Python \<= 3.10 due to breaking changes in
    4.7 (#8988)
-   Bump pytest from 8.1.1 to 8.2.0 (#8987)
-   Update README to Include FastAPI in Framework Integration Section
    (#8978)
-   Clarify return values of \...\_on_commit methods (#8984)
-   add kafka broker docs (#8935)
-   Limit pymongo\<4.7 regardless of Python version (#8999)
-   Update pymongo\[srv\] requirement from \<4.7,\>=4.0.2 to
    \>=4.0.2,\<4.8 (#9000)
-   Update elasticsearch requirement from \<=8.13.0 to \<=8.13.1 (#9004)
-   security: SecureSerializer: support generic low-level serializers
    (#8982)
-   don\'t kill if pid same as file (#8997) (#8998)
-   Update cryptography to 42.0.6 (#9005)
-   Bump cryptography from 42.0.6 to 42.0.7 (#9009)
-   don\'t kill if pid same as file (#8997) (#8998) (#9007)
-   Added -vv to unit, integration and smoke tests (#9014)
-   SecuritySerializer: ensure pack separator will not be conflicted
    with serialized fields (#9010)
-   Update sphinx-click to 5.2.2 (#9025)
-   Bump sphinx-click from 5.2.2 to 6.0.0 (#9029)
-   Fix a typo to display the help message in first-steps-with-django
    (#9036)
-   Pinned requests to v2.31.0 due to docker-py bug #3256 (#9039)
-   Fix certificate validity check (#9037)
-   Revert \"Pinned requests to v2.31.0 due to docker-py bug #3256\"
    (#9043)
-   Bump pytest from 8.2.0 to 8.2.1 (#9035)
-   Update elasticsearch requirement from \<=8.13.1 to \<=8.13.2 (#9045)
-   Fix detection of custom task set as class attribute with Django
    (#9038)
-   Update elastic-transport requirement from \<=8.13.0 to \<=8.13.1
    (#9050)
-   Bump pycouchdb from 1.14.2 to 1.16.0 (#9052)
-   Update pytest to 8.2.2 (#9060)
-   Bump cryptography from 42.0.7 to 42.0.8 (#9061)
-   Update elasticsearch requirement from \<=8.13.2 to \<=8.14.0 (#9069)
-   \[enhance feature\] Crontab schedule: allow using month names
    (#9068)
-   Enhance tox environment: \[testenv:clean\] (#9072)
-   Clarify docs about Reserve one task at a time (#9073)
-   GCS docs fixes (#9075)
-   Use hub.remove_writer instead of hub.remove for write fds (#4185)
    (#9055)
-   Class method to process crontab string (#9079)
-   Fixed smoke tests env bug when using integration tasks that rely on
    Redis (#9090)
-   Bugfix - a task will run multiple times when chaining chains with
    groups (#9021)
-   Bump mypy from 1.10.0 to 1.10.1 (#9096)
-   Don\'t add a separator to global_keyprefix if it already has one
    (#9080)
-   Update pymongo\[srv\] requirement from \<4.8,\>=4.0.2 to
    \>=4.0.2,\<4.9 (#9111)
-   Added missing import in examples for Django (#9099)
-   Bump Kombu to v5.4.0rc1 (#9117)
-   Removed skipping Redis in t/smoke/tests/test_consumer.py tests
    (#9118)
-   Update pytest-subtests to 0.13.0 (#9120)
-   Increased smoke tests CI timeout (#9122)
-   Bump Kombu to v5.4.0rc2 (#9127)
-   Update zstandard to 0.23.0 (#9129)
-   Update pytest-subtests to 0.13.1 (#9130)
-   Changed retry to tenacity in smoke tests (#9133)
-   Bump mypy from 1.10.1 to 1.11.0 (#9135)
-   Update cryptography to 43.0.0 (#9138)
-   Update pytest to 8.3.1 (#9137)
-   Added support for Quorum Queues (#9121)
-   Bump Kombu to v5.4.0rc3 (#9139)
-   Cleanup in Changelog.rst (#9141)
-   Update Django docs for CELERY_CACHE_BACKEND (#9143)
-   Added missing docs to previous releases (#9144)
-   Fixed a few documentation build warnings (#9145)
-   docs(README): link invalid (#9148)
-   Prepare for (pre) release: v5.5.0b1 (#9146)
-   Bump pytest from 8.3.1 to 8.3.2 (#9153)
-   Remove setuptools deprecated test command from setup.py (#9159)
-   Pin pre-commit to latest version 3.8.0 from Python 3.9 (#9156)
-   Bump mypy from 1.11.0 to 1.11.1 (#9164)
-   Change \"docker-compose\" to \"docker compose\" in Makefile (#9169)
-   update python versions and docker compose (#9171)
-   Add support for Pydantic model validation/serialization (fixes
    #8751) (#9023)
-   Allow local dynamodb to be installed on another host than localhost
    (#8965)
-   Terminate job implementation for gevent concurrency backend (#9083)
-   Bump Kombu to v5.4.0 (#9177)
-   Add check for soft_time_limit and time_limit values (#9173)
-   Prepare for (pre) release: v5.5.0b2 (#9178)
-   Added SQS (localstack) broker to canvas smoke tests (#9179)
-   Pin elastic-transport to \<= latest version 8.15.0 (#9182)
-   Update elasticsearch requirement from \<=8.14.0 to \<=8.15.0 (#9186)
-   improve formatting (#9188)
-   Add basic helm chart for celery (#9181)
-   Update kafka.rst (#9194)
-   Update pytest-order to 1.3.0 (#9198)
-   Update mypy to 1.11.2 (#9206)
-   all added to routes (#9204)
-   Fix typos discovered by codespell (#9212)
-   Use tzdata extras with zoneinfo backports (#8286)
-   Use [docker compose]{.title-ref} in Contributing\'s doc build
    section (#9219)
-   Failing test for issue #9119 (#9215)
-   Fix date_done timezone issue (#8385)
-   CI Fixes to smoke tests (#9223)
-   fix: passes current request context when pushing to request_stack
    (#9208)
-   Fix broken link in the Using RabbitMQ docs page (#9226)
-   Added Soft Shutdown Mechanism (#9213)
-   Added worker_enable_soft_shutdown_on_idle (#9231)
-   Bump cryptography from 43.0.0 to 43.0.1 (#9233)
-   Added docs regarding the relevancy of soft shutdown and ETA tasks
    (#9238)
-   Show broker_connection_retry_on_startup warning only if it evaluates
    as False (#9227)
-   Fixed docker-docs CI failure (#9240)
-   Added docker cleanup auto-fixture to improve smoke tests stability
    (#9243)
-   print is not thread-safe, so should not be used in signal handler
    (#9222)
-   Prepare for (pre) release: v5.5.0b3 (#9244)
-   Correct the error description in exception message when validate
    soft_time_limit (#9246)
-   Update msgpack to 1.1.0 (#9249)
-   chore(utils/time.py): rename [\_is_ambigious]{.title-ref} -\>
    [\_is_ambiguous]{.title-ref} (#9248)
-   Reduced Smoke Tests to min/max supported python (3.8/3.12) (#9252)
-   Update pytest to 8.3.3 (#9253)
-   Update elasticsearch requirement from \<=8.15.0 to \<=8.15.1 (#9255)
-   update mongodb without deprecated [\[srv\]]{.title-ref} extra
    requirement (#9258)
-   blacksmith.sh: Migrate workflows to Blacksmith (#9261)
-   Fixes #9119: inject dispatch_uid for retry-wrapped receivers (#9247)
-   Run all smoke tests CI jobs together (#9263)
-   Improve documentation on visibility timeout (#9264)
-   Bump pytest-celery to 1.1.2 (#9267)
-   Added missing \"app.conf.visibility_timeout\" in smoke tests (#9266)
-   Improved stability with t/smoke/tests/test_consumer.py (#9268)
-   Improved Redis container stability in the smoke tests (#9271)
-   Disabled EXHAUST_MEMORY tests in Smoke-tasks (#9272)
-   Marked xfail for test_reducing_prefetch_count with Redis - flaky
    test (#9273)
-   Fixed pypy unit tests random failures in the CI (#9275)
-   Fixed more pypy unit tests random failures in the CI (#9278)
-   Fix Redis container from aborting randomly (#9276)
-   Run Integration & Smoke CI tests together after unit tests passes
    (#9280)
-   Added \"loglevel verbose\" to Redis containers in smoke tests
    (#9282)
-   Fixed Redis error in the smoke tests: \"Possible SECURITY ATTACK
    detected\" (#9284)
-   Refactored the smoke tests github workflow (#9285)
-   Increased \--reruns 3-\>4 in smoke tests (#9286)
-   Improve stability of smoke tests (CI and Local) (#9287)
-   Fixed Smoke tests CI \"test-case\" lables (specific instead of
    general) (#9288)
-   Use assert_log_exists instead of wait_for_log in worker smoke tests
    (#9290)
-   Optimized t/smoke/tests/test_worker.py (#9291)
-   Enable smoke tests dockers check before each test starts (#9292)
-   Relaxed smoke tests flaky tests mechanism (#9293)
-   Updated quorum queue detection to handle multiple broker instances
    (#9294)
-   Non-lazy table creation for database backend (#9228)
-   Pin pymongo to latest version 4.9 (#9297)
-   Bump pymongo from 4.9 to 4.9.1 (#9298)
-   Bump Kombu to v5.4.2 (#9304)
-   Use rabbitmq:3 in stamping smoke tests (#9307)
-   Bump pytest-celery to 1.1.3 (#9308)
-   Added Python 3.13 Support (#9309)
-   Add log when global qos is disabled (#9296)
-   Added official release docs (whatsnew) for v5.5 (#9312)
-   Enable Codespell autofix (#9313)
-   Pydantic typehints: Fix optional, allow generics (#9319)
-   Prepare for (pre) release: v5.5.0b4 (#9322)
-   Added Blacksmith.sh to the Sponsors section in the README (#9323)
-   Revert \"Added Blacksmith.sh to the Sponsors section in the README\"
    (#9324)
-   Added Blacksmith.sh to the Sponsors section in the README (#9325)
-   Added missing \" " in README (#9326)
-   Use Blacksmith SVG logo (#9327)
-   Updated Blacksmith SVG logo (#9328)
-   Revert \"Updated Blacksmith SVG logo\" (#9329)
-   Update pymongo to 4.10.0 (#9330)
-   Update pymongo to 4.10.1 (#9332)
-   Update user guide to recommend delay_on_commit (#9333)
-   Pin pre-commit to latest version 4.0.0 (Python 3.9+) (#9334)
-   Update ephem to 4.1.6 (#9336)
-   Updated Blacksmith SVG logo (#9337)
-   Prepare for (pre) release: v5.5.0rc1 (#9341)
-   Fix: Treat dbm.error as a corrupted schedule file (#9331)
-   Pin pre-commit to latest version 4.0.1 (#9343)
-   Added Python 3.13 to Dockerfiles (#9350)
-   Skip test_pool_restart_import_modules on PyPy due to test issue
    (#9352)
-   Update elastic-transport requirement from \<=8.15.0 to \<=8.15.1
    (#9347)
-   added dragonfly logo (#9353)
-   Update README.rst (#9354)
-   Update README.rst (#9355)
-   Update mypy to 1.12.0 (#9356)
-   Bump Kombu to v5.5.0rc1 (#9357)
-   Fix [celery \--loader]{.title-ref} option parsing (#9361)
-   Add support for Google Pub/Sub transport (#9351)
-   Add native incr support for GCSBackend (#9302)
-   fix(perform_pending_operations): prevent task duplication on
    shutdown... (#9348)
-   Update grpcio to 1.67.0 (#9365)
-   Update google-cloud-firestore to 2.19.0 (#9364)
-   Annotate celery/utils/timer2.py (#9362)
-   Update cryptography to 43.0.3 (#9366)
-   Update mypy to 1.12.1 (#9368)
-   Bump mypy from 1.12.1 to 1.13.0 (#9373)
-   Pass timeout and confirm_timeout to producer.publish() (#9374)
-   Bump Kombu to v5.5.0rc2 (#9382)
-   Bump pytest-cov from 5.0.0 to 6.0.0 (#9388)
-   default strict to False for pydantic tasks (#9393)
-   Only log that global QoS is disabled if using amqp (#9395)
-   chore: update sponsorship logo (#9398)
-   Allow custom hostname for celery_worker in celery.contrib.pytest /
    celery.contrib.testing.worker (#9405)
-   Removed docker-docs from CI (optional job, malfunctioning) (#9406)
-   Added a utility to format changelogs from the auto-generated GitHub
    release notes (#9408)
-   Bump codecov/codecov-action from 4 to 5 (#9412)
-   Update elasticsearch requirement from \<=8.15.1 to \<=8.16.0 (#9410)
-   Native Delayed Delivery in RabbitMQ (#9207)
-   Prepare for (pre) release: v5.5.0rc2 (#9416)
-   Document usage of broker_native_delayed_delivery_queue_type (#9419)
-   Adjust section in what\'s new document regarding quorum queues
    support (#9420)
-   Update pytest-rerunfailures to 15.0 (#9422)
-   Document group unrolling (#9421)
-   fix small typo acces -\> access (#9434)
-   Update cryptography to 44.0.0 (#9437)
-   Added pypy to Dockerfile (#9438)
-   Skipped flaky tests on pypy (all pass after \~10 reruns) (#9439)
-   Allowing managed credentials for azureblockblob (#9430)
-   Allow passing Celery objects to the Click entry point (#9426)
-   support Request termination for gevent (#9440)
-   Prevent event_mask from being overwritten. (#9432)
-   Update pytest to 8.3.4 (#9444)
-   Prepare for (pre) release: v5.5.0rc3 (#9450)
-   Bugfix: SIGQUIT not initiating cold shutdown when
    [task_acks_late=False]{.title-ref} (#9461)
-   Fixed pycurl dep with Python 3.8 (#9471)
-   Update elasticsearch requirement from \<=8.16.0 to \<=8.17.0 (#9469)
-   Bump pytest-subtests from 0.13.1 to 0.14.1 (#9459)
-   documentation: Added a type annotation to the periodic task example
    (#9473)
-   Prepare for (pre) release: v5.5.0rc4 (#9474)
-   Bump mypy from 1.13.0 to 1.14.0 (#9476)
-   Fix cassandra backend port settings not working (#9465)
-   Unroll group when a group with a single item is chained using the \|
    operator (#9456)
-   fix(django): catch the right error when trying to close db
    connection (#9392)
-   Replacing a task with a chain which contains a group now returns a
    result instead of hanging (#9484)
-   Avoid using a group of one as it is now unrolled into a chain
    (#9510)
-   Link to the correct IRC network (#9509)
-   Bump pytest-github-actions-annotate-failures from 0.2.0 to 0.3.0
    (#9504)
-   Update canvas.rst to fix output result from chain object (#9502)
-   Unauthorized Changes Cleanup (#9528)
-   \[RE-APPROVED\] fix(django): catch the right error when trying to
    close db connection (#9529)
-   \[RE-APPROVED\] Link to the correct IRC network (#9531)
-   \[RE-APPROVED\] Update canvas.rst to fix output result from chain
    object (#9532)
-   Update test-ci-base.txt (#9539)
-   Update install-pyenv.sh (#9540)
-   Update elasticsearch requirement from \<=8.17.0 to \<=8.17.1 (#9518)
-   Bump google-cloud-firestore from 2.19.0 to 2.20.0 (#9493)
-   Bump mypy from 1.14.0 to 1.14.1 (#9483)
-   Update elastic-transport requirement from \<=8.15.1 to \<=8.17.0
    (#9490)
-   Update Dockerfile by adding missing Python version 3.13 (#9549)
-   Fix typo for default of sig (#9495)
-   fix(crontab): resolve constructor type conflicts (#9551)
-   worker_max_memory_per_child: kilobyte is 1024 bytes (#9553)
-   Fix formatting in quorum queue docs (#9555)
-   Bump cryptography from 44.0.0 to 44.0.1 (#9556)
-   Fix the send_task method when detecting if the native delayed
    delivery approach is available (#9552)
-   Reverted PR #7814 & minor code improvement (#9494)
-   Improved donation and sponsorship visibility (#9558)
-   Updated the Getting Help section, replacing deprecated with new
    resources (#9559)
-   Fixed django example (#9562)
-   Bump Kombu to v5.5.0rc3 (#9564)
-   Bump ephem from 4.1.6 to 4.2 (#9565)
-   Bump pytest-celery to v1.2.0 (#9568)
-   Remove dependency on [pycurl]{.title-ref} (#9526)
-   Set TestWorkController.\_\_test\_\_ (#9574)
-   Fixed bug when revoking by stamped headers a stamp that does not
    exist (#9575)
-   Canvas Stamping Doc Fixes (#9578)
-   Bugfix: Chord with a chord in header doesn\'t invoke error callback
    on inner chord header failure (default config) (#9580)
-   Prepare for (pre) release: v5.5.0rc5 (#9582)
-   Bump google-cloud-firestore from 2.20.0 to 2.20.1 (#9584)
-   Fix tests with Click 8.2 (#9590)
-   Bump cryptography from 44.0.1 to 44.0.2 (#9591)
-   Update elasticsearch requirement from \<=8.17.1 to \<=8.17.2 (#9594)
-   Bump pytest from 8.3.4 to 8.3.5 (#9598)
-   Refactored and Enhanced DelayedDelivery bootstep (#9599)
-   Improve docs about acks_on_failure_or_timeout (#9577)
-   Update SECURITY.md (#9609)
-   remove flake8plus as not needed anymore (#9610)
-   remove \[bdist_wheel\] universal = 0 from setup.cfg as not needed
    (#9611)
-   remove importlib-metadata as not needed in python3.8 anymore (#9612)
-   feat: define exception_safe_to_retry for redisbackend (#9614)
-   Bump Kombu to v5.5.0 (#9615)
-   Update elastic-transport requirement from \<=8.17.0 to \<=8.17.1
    (#9616)
-   \[docs\] fix first-steps (#9618)
-   Revert \"Improve docs about acks_on_failure_or_timeout\" (#9606)
-   Improve CI stability and performance (#9624)
-   Improved explanation for Database transactions at user guide for
    tasks (#9617)
-   update tests to use python 3.8 codes only (#9627)
-   #9597: Ensure surpassing Hard Timeout limit when
    task_acks_on_failure_or_timeout is False rejects the task (#9626)
-   Lock Kombu to v5.5.x (using urllib3 instead of pycurl) (#9632)
-   Lock pytest-celery to v1.2.x (using urllib3 instead of pycurl)
    (#9633)
-   Add Codecov Test Analytics (#9635)
-   Bump Kombu to v5.5.2 (#9643)
-   Prepare for release: v5.5.0 (#9644)

## 5.5.0rc5 {#version-5.5.0rc5}

release-date

:   2025-02-25

release-by

:   Tomer Nosrati

Celery v5.5.0 Release Candidate 5 is now available for testing. Please
help us test this version and report any issues.

### Key Highlights

See `whatsnew-5.5`{.interpreted-text role="ref"} or read the main
highlights below.

#### Using Kombu 5.5.0rc3

The minimum required Kombu version has been bumped to 5.5.0. Kombu is
currently at 5.5.0rc3.

#### Complete Quorum Queues Support

A completely new ETA mechanism was developed to allow full support with
RabbitMQ Quorum Queues.

After upgrading to this version, please share your feedback on the
quorum queues support.

Relevant Issues:
[#9207](https://github.com/celery/celery/discussions/9207),
[#6067](https://github.com/celery/celery/discussions/6067)

-   New `documentation <using-quorum-queues>`{.interpreted-text
    role="ref"}.
-   New `broker_native_delayed_delivery_queue_type`{.interpreted-text
    role="setting"} configuration option.

#### New support for Google Pub/Sub transport

After upgrading to this version, please share your feedback on the
Google Pub/Sub transport support.

Relevant Issues: [#9351](https://github.com/celery/celery/pull/9351)

#### Python 3.13 Improved Support

Additional dependencies have been migrated successfully to Python 3.13,
including Kombu and py-amqp.

#### Soft Shutdown

The soft shutdown is a new mechanism in Celery that sits between the
warm shutdown and the cold shutdown. It sets a time limited \"warm
shutdown\" period, during which the worker will continue to process
tasks that are already running. After the soft shutdown ends, the worker
will initiate a graceful cold shutdown, stopping all tasks and exiting.

The soft shutdown is disabled by default, and can be enabled by setting
the new configuration option
`worker_soft_shutdown_timeout`{.interpreted-text role="setting"}. If a
worker is not running any task when the soft shutdown initiates, it will
skip the warm shutdown period and proceed directly to the cold shutdown
unless the new configuration option
`worker_enable_soft_shutdown_on_idle`{.interpreted-text role="setting"}
is set to True. This is useful for workers that are idle, waiting on ETA
tasks to be executed that still want to enable the soft shutdown
anyways.

The soft shutdown can replace the cold shutdown when using a broker with
a visibility timeout mechanism, like
`Redis <broker-redis>`{.interpreted-text role="ref"} or
`SQS <broker-sqs>`{.interpreted-text role="ref"}, to enable a more
graceful cold shutdown procedure, allowing the worker enough time to
re-queue tasks that were not completed (e.g.,
`Restoring 1 unacknowledged message(s)`) by resetting the visibility
timeout of the unacknowledged messages just before the worker exits
completely.

After upgrading to this version, please share your feedback on the new
Soft Shutdown mechanism.

Relevant Issues: [#9213](https://github.com/celery/celery/pull/9213),
[#9231](https://github.com/celery/celery/pull/9231),
[#9238](https://github.com/celery/celery/pull/9238)

-   New `documentation <worker-stopping>`{.interpreted-text role="ref"}
    for each shutdown type.
-   New `worker_soft_shutdown_timeout`{.interpreted-text role="setting"}
    configuration option.
-   New `worker_enable_soft_shutdown_on_idle`{.interpreted-text
    role="setting"} configuration option.

#### REMAP_SIGTERM

The `REMAP_SIGTERM` \"hidden feature\" has been tested,
`documented <worker-REMAP_SIGTERM>`{.interpreted-text role="ref"} and is
now officially supported. This feature allows users to remap the SIGTERM
signal to SIGQUIT, to initiate a soft or a cold shutdown using
`TERM`{.interpreted-text role="sig"} instead of `QUIT`{.interpreted-text
role="sig"}.

#### Pydantic Support

This release introduces support for Pydantic models in Celery tasks. For
more info, see the new pydantic example and PR
[#9023](https://github.com/celery/celery/pull/9023) by \@mathiasertl.

After upgrading to this version, please share your feedback on the new
Pydantic support.

#### Redis Broker Stability Improvements

The root cause of the Redis broker instability issue has been
[identified and resolved](https://github.com/celery/kombu/pull/2007) in
the v5.4.0 release of Kombu, which should resolve the disconnections bug
and offer additional improvements.

After upgrading to this version, please share your feedback on the Redis
broker stability.

Relevant Issues:
[#7276](https://github.com/celery/celery/discussions/7276),
[#8091](https://github.com/celery/celery/discussions/8091),
[#8030](https://github.com/celery/celery/discussions/8030),
[#8384](https://github.com/celery/celery/discussions/8384)

#### Quorum Queues Initial Support

This release introduces the initial support for Quorum Queues with
Celery.

See new configuration options for more details:

-   `task_default_queue_type`{.interpreted-text role="setting"}
-   `worker_detect_quorum_queues`{.interpreted-text role="setting"}

After upgrading to this version, please share your feedback on the
Quorum Queues support.

Relevant Issues:
[#6067](https://github.com/celery/celery/discussions/6067),
[#9121](https://github.com/celery/celery/discussions/9121)

### What\'s Changed

-   Bump mypy from 1.13.0 to 1.14.0 (#9476)
-   Fix cassandra backend port settings not working (#9465)
-   Unroll group when a group with a single item is chained using the \|
    operator (#9456)
-   fix(django): catch the right error when trying to close db
    connection (#9392)
-   Replacing a task with a chain which contains a group now returns a
    result instead of hanging (#9484)
-   Avoid using a group of one as it is now unrolled into a chain
    (#9510)
-   Link to the correct IRC network (#9509)
-   Bump pytest-github-actions-annotate-failures from 0.2.0 to 0.3.0
    (#9504)
-   Update canvas.rst to fix output result from chain object (#9502)
-   Unauthorized Changes Cleanup (#9528)
-   \[RE-APPROVED\] fix(django): catch the right error when trying to
    close db connection (#9529)
-   \[RE-APPROVED\] Link to the correct IRC network (#9531)
-   \[RE-APPROVED\] Update canvas.rst to fix output result from chain
    object (#9532)
-   Update test-ci-base.txt (#9539)
-   Update install-pyenv.sh (#9540)
-   Update elasticsearch requirement from \<=8.17.0 to \<=8.17.1 (#9518)
-   Bump google-cloud-firestore from 2.19.0 to 2.20.0 (#9493)
-   Bump mypy from 1.14.0 to 1.14.1 (#9483)
-   Update elastic-transport requirement from \<=8.15.1 to \<=8.17.0
    (#9490)
-   Update Dockerfile by adding missing Python version 3.13 (#9549)
-   Fix typo for default of sig (#9495)
-   fix(crontab): resolve constructor type conflicts (#9551)
-   worker_max_memory_per_child: kilobyte is 1024 bytes (#9553)
-   Fix formatting in quorum queue docs (#9555)
-   Bump cryptography from 44.0.0 to 44.0.1 (#9556)
-   Fix the send_task method when detecting if the native delayed
    delivery approach is available (#9552)
-   Reverted PR #7814 & minor code improvement (#9494)
-   Improved donation and sponsorship visibility (#9558)
-   Updated the Getting Help section, replacing deprecated with new
    resources (#9559)
-   Fixed django example (#9562)
-   Bump Kombu to v5.5.0rc3 (#9564)
-   Bump ephem from 4.1.6 to 4.2 (#9565)
-   Bump pytest-celery to v1.2.0 (#9568)
-   Remove dependency on [pycurl]{.title-ref} (#9526)
-   Set TestWorkController.\_\_test\_\_ (#9574)
-   Fixed bug when revoking by stamped headers a stamp that does not
    exist (#9575)
-   Canvas Stamping Doc Fixes (#9578)
-   Bugfix: Chord with a chord in header doesn\'t invoke error callback
    on inner chord header failure (default config) (#9580)
-   Prepare for (pre) release: v5.5.0rc5 (#9582)

## 5.5.0rc4 {#version-5.5.0rc4}

release-date

:   2024-12-19

release-by

:   Tomer Nosrati

Celery v5.5.0 Release Candidate 4 is now available for testing. Please
help us test this version and report any issues.

### Key Highlights

See `whatsnew-5.5`{.interpreted-text role="ref"} or read the main
highlights below.

#### Using Kombu 5.5.0rc2

The minimum required Kombu version has been bumped to 5.5.0. Kombu is
current at 5.5.0rc2.

#### Complete Quorum Queues Support

A completely new ETA mechanism was developed to allow full support with
RabbitMQ Quorum Queues.

After upgrading to this version, please share your feedback on the
quorum queues support.

Relevant Issues:
[#9207](https://github.com/celery/celery/discussions/9207),
[#6067](https://github.com/celery/celery/discussions/6067)

-   New `documentation <using-quorum-queues>`{.interpreted-text
    role="ref"}.
-   New `broker_native_delayed_delivery_queue_type`{.interpreted-text
    role="setting"} configuration option.

#### New support for Google Pub/Sub transport

After upgrading to this version, please share your feedback on the
Google Pub/Sub transport support.

Relevant Issues: [#9351](https://github.com/celery/celery/pull/9351)

#### Python 3.13 Improved Support

Additional dependencies have been migrated successfully to Python 3.13,
including Kombu and py-amqp.

#### Soft Shutdown

The soft shutdown is a new mechanism in Celery that sits between the
warm shutdown and the cold shutdown. It sets a time limited \"warm
shutdown\" period, during which the worker will continue to process
tasks that are already running. After the soft shutdown ends, the worker
will initiate a graceful cold shutdown, stopping all tasks and exiting.

The soft shutdown is disabled by default, and can be enabled by setting
the new configuration option
`worker_soft_shutdown_timeout`{.interpreted-text role="setting"}. If a
worker is not running any task when the soft shutdown initiates, it will
skip the warm shutdown period and proceed directly to the cold shutdown
unless the new configuration option
`worker_enable_soft_shutdown_on_idle`{.interpreted-text role="setting"}
is set to True. This is useful for workers that are idle, waiting on ETA
tasks to be executed that still want to enable the soft shutdown
anyways.

The soft shutdown can replace the cold shutdown when using a broker with
a visibility timeout mechanism, like
`Redis <broker-redis>`{.interpreted-text role="ref"} or
`SQS <broker-sqs>`{.interpreted-text role="ref"}, to enable a more
graceful cold shutdown procedure, allowing the worker enough time to
re-queue tasks that were not completed (e.g.,
`Restoring 1 unacknowledged message(s)`) by resetting the visibility
timeout of the unacknowledged messages just before the worker exits
completely.

After upgrading to this version, please share your feedback on the new
Soft Shutdown mechanism.

Relevant Issues: [#9213](https://github.com/celery/celery/pull/9213),
[#9231](https://github.com/celery/celery/pull/9231),
[#9238](https://github.com/celery/celery/pull/9238)

-   New `documentation <worker-stopping>`{.interpreted-text role="ref"}
    for each shutdown type.
-   New `worker_soft_shutdown_timeout`{.interpreted-text role="setting"}
    configuration option.
-   New `worker_enable_soft_shutdown_on_idle`{.interpreted-text
    role="setting"} configuration option.

#### REMAP_SIGTERM

The `REMAP_SIGTERM` \"hidden feature\" has been tested,
`documented <worker-REMAP_SIGTERM>`{.interpreted-text role="ref"} and is
now officially supported. This feature allows users to remap the SIGTERM
signal to SIGQUIT, to initiate a soft or a cold shutdown using
`TERM`{.interpreted-text role="sig"} instead of `QUIT`{.interpreted-text
role="sig"}.

#### Pydantic Support

This release introduces support for Pydantic models in Celery tasks. For
more info, see the new pydantic example and PR
[#9023](https://github.com/celery/celery/pull/9023) by \@mathiasertl.

After upgrading to this version, please share your feedback on the new
Pydantic support.

#### Redis Broker Stability Improvements

The root cause of the Redis broker instability issue has been
[identified and resolved](https://github.com/celery/kombu/pull/2007) in
the v5.4.0 release of Kombu, which should resolve the disconnections bug
and offer additional improvements.

After upgrading to this version, please share your feedback on the Redis
broker stability.

Relevant Issues:
[#7276](https://github.com/celery/celery/discussions/7276),
[#8091](https://github.com/celery/celery/discussions/8091),
[#8030](https://github.com/celery/celery/discussions/8030),
[#8384](https://github.com/celery/celery/discussions/8384)

#### Quorum Queues Initial Support

This release introduces the initial support for Quorum Queues with
Celery.

See new configuration options for more details:

-   `task_default_queue_type`{.interpreted-text role="setting"}
-   `worker_detect_quorum_queues`{.interpreted-text role="setting"}

After upgrading to this version, please share your feedback on the
Quorum Queues support.

Relevant Issues:
[#6067](https://github.com/celery/celery/discussions/6067),
[#9121](https://github.com/celery/celery/discussions/9121)

### What\'s Changed

-   Bugfix: SIGQUIT not initiating cold shutdown when
    [task_acks_late=False]{.title-ref} (#9461)
-   Fixed pycurl dep with Python 3.8 (#9471)
-   Update elasticsearch requirement from \<=8.16.0 to \<=8.17.0 (#9469)
-   Bump pytest-subtests from 0.13.1 to 0.14.1 (#9459)
-   documentation: Added a type annotation to the periodic task example
    (#9473)
-   Prepare for (pre) release: v5.5.0rc4 (#9474)

## 5.5.0rc3 {#version-5.5.0rc3}

release-date

:   2024-12-03

release-by

:   Tomer Nosrati

Celery v5.5.0 Release Candidate 3 is now available for testing. Please
help us test this version and report any issues.

### Key Highlights

See `whatsnew-5.5`{.interpreted-text role="ref"} or read the main
highlights below.

#### Using Kombu 5.5.0rc2

The minimum required Kombu version has been bumped to 5.5.0. Kombu is
current at 5.5.0rc2.

#### Complete Quorum Queues Support

A completely new ETA mechanism was developed to allow full support with
RabbitMQ Quorum Queues.

After upgrading to this version, please share your feedback on the
quorum queues support.

Relevant Issues:
[#9207](https://github.com/celery/celery/discussions/9207),
[#6067](https://github.com/celery/celery/discussions/6067)

-   New `documentation <using-quorum-queues>`{.interpreted-text
    role="ref"}.
-   New `broker_native_delayed_delivery_queue_type`{.interpreted-text
    role="setting"} configuration option.

#### New support for Google Pub/Sub transport

After upgrading to this version, please share your feedback on the
Google Pub/Sub transport support.

Relevant Issues: [#9351](https://github.com/celery/celery/pull/9351)

#### Python 3.13 Improved Support

Additional dependencies have been migrated successfully to Python 3.13,
including Kombu and py-amqp.

#### Soft Shutdown

The soft shutdown is a new mechanism in Celery that sits between the
warm shutdown and the cold shutdown. It sets a time limited \"warm
shutdown\" period, during which the worker will continue to process
tasks that are already running. After the soft shutdown ends, the worker
will initiate a graceful cold shutdown, stopping all tasks and exiting.

The soft shutdown is disabled by default, and can be enabled by setting
the new configuration option
`worker_soft_shutdown_timeout`{.interpreted-text role="setting"}. If a
worker is not running any task when the soft shutdown initiates, it will
skip the warm shutdown period and proceed directly to the cold shutdown
unless the new configuration option
`worker_enable_soft_shutdown_on_idle`{.interpreted-text role="setting"}
is set to True. This is useful for workers that are idle, waiting on ETA
tasks to be executed that still want to enable the soft shutdown
anyways.

The soft shutdown can replace the cold shutdown when using a broker with
a visibility timeout mechanism, like
`Redis <broker-redis>`{.interpreted-text role="ref"} or
`SQS <broker-sqs>`{.interpreted-text role="ref"}, to enable a more
graceful cold shutdown procedure, allowing the worker enough time to
re-queue tasks that were not completed (e.g.,
`Restoring 1 unacknowledged message(s)`) by resetting the visibility
timeout of the unacknowledged messages just before the worker exits
completely.

After upgrading to this version, please share your feedback on the new
Soft Shutdown mechanism.

Relevant Issues: [#9213](https://github.com/celery/celery/pull/9213),
[#9231](https://github.com/celery/celery/pull/9231),
[#9238](https://github.com/celery/celery/pull/9238)

-   New `documentation <worker-stopping>`{.interpreted-text role="ref"}
    for each shutdown type.
-   New `worker_soft_shutdown_timeout`{.interpreted-text role="setting"}
    configuration option.
-   New `worker_enable_soft_shutdown_on_idle`{.interpreted-text
    role="setting"} configuration option.

#### REMAP_SIGTERM

The `REMAP_SIGTERM` \"hidden feature\" has been tested,
`documented <worker-REMAP_SIGTERM>`{.interpreted-text role="ref"} and is
now officially supported. This feature allows users to remap the SIGTERM
signal to SIGQUIT, to initiate a soft or a cold shutdown using
`TERM`{.interpreted-text role="sig"} instead of `QUIT`{.interpreted-text
role="sig"}.

#### Pydantic Support

This release introduces support for Pydantic models in Celery tasks. For
more info, see the new pydantic example and PR
[#9023](https://github.com/celery/celery/pull/9023) by \@mathiasertl.

After upgrading to this version, please share your feedback on the new
Pydantic support.

#### Redis Broker Stability Improvements

The root cause of the Redis broker instability issue has been
[identified and resolved](https://github.com/celery/kombu/pull/2007) in
the v5.4.0 release of Kombu, which should resolve the disconnections bug
and offer additional improvements.

After upgrading to this version, please share your feedback on the Redis
broker stability.

Relevant Issues:
[#7276](https://github.com/celery/celery/discussions/7276),
[#8091](https://github.com/celery/celery/discussions/8091),
[#8030](https://github.com/celery/celery/discussions/8030),
[#8384](https://github.com/celery/celery/discussions/8384)

#### Quorum Queues Initial Support

This release introduces the initial support for Quorum Queues with
Celery.

See new configuration options for more details:

-   `task_default_queue_type`{.interpreted-text role="setting"}
-   `worker_detect_quorum_queues`{.interpreted-text role="setting"}

After upgrading to this version, please share your feedback on the
Quorum Queues support.

Relevant Issues:
[#6067](https://github.com/celery/celery/discussions/6067),
[#9121](https://github.com/celery/celery/discussions/9121)

### What\'s Changed

-   Document usage of broker_native_delayed_delivery_queue_type (#9419)
-   Adjust section in what\'s new document regarding quorum queues
    support (#9420)
-   Update pytest-rerunfailures to 15.0 (#9422)
-   Document group unrolling (#9421)
-   fix small typo acces -\> access (#9434)
-   Update cryptography to 44.0.0 (#9437)
-   Added pypy to Dockerfile (#9438)
-   Skipped flaky tests on pypy (all pass after \~10 reruns) (#9439)
-   Allowing managed credentials for azureblockblob (#9430)
-   Allow passing Celery objects to the Click entry point (#9426)
-   support Request termination for gevent (#9440)
-   Prevent event_mask from being overwritten. (#9432)
-   Update pytest to 8.3.4 (#9444)
-   Prepare for (pre) release: v5.5.0rc3 (#9450)

## 5.5.0rc2 {#version-5.5.0rc2}

release-date

:   2024-11-18

release-by

:   Tomer Nosrati

Celery v5.5.0 Release Candidate 2 is now available for testing. Please
help us test this version and report any issues.

### Key Highlights

See `whatsnew-5.5`{.interpreted-text role="ref"} or read the main
highlights below.

#### Using Kombu 5.5.0rc2

The minimum required Kombu version has been bumped to 5.5.0. Kombu is
current at 5.5.0rc2.

#### Complete Quorum Queues Support

A completely new ETA mechanism was developed to allow full support with
RabbitMQ Quorum Queues.

After upgrading to this version, please share your feedback on the
quorum queues support.

Relevant Issues:
[#9207](https://github.com/celery/celery/discussions/9207),
[#6067](https://github.com/celery/celery/discussions/6067)

-   New `documentation <using-quorum-queues>`{.interpreted-text
    role="ref"}.
-   New `broker_native_delayed_delivery_queue_type`{.interpreted-text
    role="setting"} configuration option.

#### New support for Google Pub/Sub transport

After upgrading to this version, please share your feedback on the
Google Pub/Sub transport support.

Relevant Issues: [#9351](https://github.com/celery/celery/pull/9351)

#### Python 3.13 Improved Support

Additional dependencies have been migrated successfully to Python 3.13,
including Kombu and py-amqp.

### Previous Pre-release Highlights

#### Python 3.13 Initial Support

This release introduces the initial support for Python 3.13 with Celery.

After upgrading to this version, please share your feedback on the
Python 3.13 support.

#### Soft Shutdown

The soft shutdown is a new mechanism in Celery that sits between the
warm shutdown and the cold shutdown. It sets a time limited \"warm
shutdown\" period, during which the worker will continue to process
tasks that are already running. After the soft shutdown ends, the worker
will initiate a graceful cold shutdown, stopping all tasks and exiting.

The soft shutdown is disabled by default, and can be enabled by setting
the new configuration option
`worker_soft_shutdown_timeout`{.interpreted-text role="setting"}. If a
worker is not running any task when the soft shutdown initiates, it will
skip the warm shutdown period and proceed directly to the cold shutdown
unless the new configuration option
`worker_enable_soft_shutdown_on_idle`{.interpreted-text role="setting"}
is set to True. This is useful for workers that are idle, waiting on ETA
tasks to be executed that still want to enable the soft shutdown
anyways.

The soft shutdown can replace the cold shutdown when using a broker with
a visibility timeout mechanism, like
`Redis <broker-redis>`{.interpreted-text role="ref"} or
`SQS <broker-sqs>`{.interpreted-text role="ref"}, to enable a more
graceful cold shutdown procedure, allowing the worker enough time to
re-queue tasks that were not completed (e.g.,
`Restoring 1 unacknowledged message(s)`) by resetting the visibility
timeout of the unacknowledged messages just before the worker exits
completely.

After upgrading to this version, please share your feedback on the new
Soft Shutdown mechanism.

Relevant Issues: [#9213](https://github.com/celery/celery/pull/9213),
[#9231](https://github.com/celery/celery/pull/9231),
[#9238](https://github.com/celery/celery/pull/9238)

-   New `documentation <worker-stopping>`{.interpreted-text role="ref"}
    for each shutdown type.
-   New `worker_soft_shutdown_timeout`{.interpreted-text role="setting"}
    configuration option.
-   New `worker_enable_soft_shutdown_on_idle`{.interpreted-text
    role="setting"} configuration option.

#### REMAP_SIGTERM

The `REMAP_SIGTERM` \"hidden feature\" has been tested,
`documented <worker-REMAP_SIGTERM>`{.interpreted-text role="ref"} and is
now officially supported. This feature allows users to remap the SIGTERM
signal to SIGQUIT, to initiate a soft or a cold shutdown using
`TERM`{.interpreted-text role="sig"} instead of `QUIT`{.interpreted-text
role="sig"}.

#### Pydantic Support

This release introduces support for Pydantic models in Celery tasks. For
more info, see the new pydantic example and PR
[#9023](https://github.com/celery/celery/pull/9023) by \@mathiasertl.

After upgrading to this version, please share your feedback on the new
Pydantic support.

#### Redis Broker Stability Improvements

The root cause of the Redis broker instability issue has been
[identified and resolved](https://github.com/celery/kombu/pull/2007) in
the v5.4.0 release of Kombu, which should resolve the disconnections bug
and offer additional improvements.

After upgrading to this version, please share your feedback on the Redis
broker stability.

Relevant Issues:
[#7276](https://github.com/celery/celery/discussions/7276),
[#8091](https://github.com/celery/celery/discussions/8091),
[#8030](https://github.com/celery/celery/discussions/8030),
[#8384](https://github.com/celery/celery/discussions/8384)

#### Quorum Queues Initial Support

This release introduces the initial support for Quorum Queues with
Celery.

See new configuration options for more details:

-   `task_default_queue_type`{.interpreted-text role="setting"}
-   `worker_detect_quorum_queues`{.interpreted-text role="setting"}

After upgrading to this version, please share your feedback on the
Quorum Queues support.

Relevant Issues:
[#6067](https://github.com/celery/celery/discussions/6067),
[#9121](https://github.com/celery/celery/discussions/9121)

### What\'s Changed

-   Fix: Treat dbm.error as a corrupted schedule file (#9331)
-   Pin pre-commit to latest version 4.0.1 (#9343)
-   Added Python 3.13 to Dockerfiles (#9350)
-   Skip test_pool_restart_import_modules on PyPy due to test issue
    (#9352)
-   Update elastic-transport requirement from \<=8.15.0 to \<=8.15.1
    (#9347)
-   added dragonfly logo (#9353)
-   Update README.rst (#9354)
-   Update README.rst (#9355)
-   Update mypy to 1.12.0 (#9356)
-   Bump Kombu to v5.5.0rc1 (#9357)
-   Fix [celery \--loader]{.title-ref} option parsing (#9361)
-   Add support for Google Pub/Sub transport (#9351)
-   Add native incr support for GCSBackend (#9302)
-   fix(perform_pending_operations): prevent task duplication on
    shutdown... (#9348)
-   Update grpcio to 1.67.0 (#9365)
-   Update google-cloud-firestore to 2.19.0 (#9364)
-   Annotate celery/utils/timer2.py (#9362)
-   Update cryptography to 43.0.3 (#9366)
-   Update mypy to 1.12.1 (#9368)
-   Bump mypy from 1.12.1 to 1.13.0 (#9373)
-   Pass timeout and confirm_timeout to producer.publish() (#9374)
-   Bump Kombu to v5.5.0rc2 (#9382)
-   Bump pytest-cov from 5.0.0 to 6.0.0 (#9388)
-   default strict to False for pydantic tasks (#9393)
-   Only log that global QoS is disabled if using amqp (#9395)
-   chore: update sponsorship logo (#9398)
-   Allow custom hostname for celery_worker in celery.contrib.pytest /
    celery.contrib.testing.worker (#9405)
-   Removed docker-docs from CI (optional job, malfunctioning) (#9406)
-   Added a utility to format changelogs from the auto-generated GitHub
    release notes (#9408)
-   Bump codecov/codecov-action from 4 to 5 (#9412)
-   Update elasticsearch requirement from \<=8.15.1 to \<=8.16.0 (#9410)
-   Native Delayed Delivery in RabbitMQ (#9207)
-   Prepare for (pre) release: v5.5.0rc2 (#9416)

## 5.5.0rc1 {#version-5.5.0rc1}

release-date

:   2024-10-08

release-by

:   Tomer Nosrati

Celery v5.5.0 Release Candidate 1 is now available for testing. Please
help us test this version and report any issues.

### Key Highlights

See `whatsnew-5.5`{.interpreted-text role="ref"} or read main highlights
below.

#### Python 3.13 Initial Support

This release introduces the initial support for Python 3.13 with Celery.

After upgrading to this version, please share your feedback on the
Python 3.13 support.

#### Soft Shutdown

The soft shutdown is a new mechanism in Celery that sits between the
warm shutdown and the cold shutdown. It sets a time limited \"warm
shutdown\" period, during which the worker will continue to process
tasks that are already running. After the soft shutdown ends, the worker
will initiate a graceful cold shutdown, stopping all tasks and exiting.

The soft shutdown is disabled by default, and can be enabled by setting
the new configuration option
`worker_soft_shutdown_timeout`{.interpreted-text role="setting"}. If a
worker is not running any task when the soft shutdown initiates, it will
skip the warm shutdown period and proceed directly to the cold shutdown
unless the new configuration option
`worker_enable_soft_shutdown_on_idle`{.interpreted-text role="setting"}
is set to True. This is useful for workers that are idle, waiting on ETA
tasks to be executed that still want to enable the soft shutdown
anyways.

The soft shutdown can replace the cold shutdown when using a broker with
a visibility timeout mechanism, like
`Redis <broker-redis>`{.interpreted-text role="ref"} or
`SQS <broker-sqs>`{.interpreted-text role="ref"}, to enable a more
graceful cold shutdown procedure, allowing the worker enough time to
re-queue tasks that were not completed (e.g.,
`Restoring 1 unacknowledged message(s)`) by resetting the visibility
timeout of the unacknowledged messages just before the worker exits
completely.

After upgrading to this version, please share your feedback on the new
Soft Shutdown mechanism.

Relevant Issues: [#9213](https://github.com/celery/celery/pull/9213),
[#9231](https://github.com/celery/celery/pull/9231),
[#9238](https://github.com/celery/celery/pull/9238)

-   New `documentation <worker-stopping>`{.interpreted-text role="ref"}
    for each shutdown type.
-   New `worker_soft_shutdown_timeout`{.interpreted-text role="setting"}
    configuration option.
-   New `worker_enable_soft_shutdown_on_idle`{.interpreted-text
    role="setting"} configuration option.

#### REMAP_SIGTERM

The `REMAP_SIGTERM` \"hidden feature\" has been tested,
`documented <worker-REMAP_SIGTERM>`{.interpreted-text role="ref"} and is
now officially supported. This feature allows users to remap the SIGTERM
signal to SIGQUIT, to initiate a soft or a cold shutdown using
`TERM`{.interpreted-text role="sig"} instead of `QUIT`{.interpreted-text
role="sig"}.

#### Pydantic Support

This release introduces support for Pydantic models in Celery tasks. For
more info, see the new pydantic example and PR
[#9023](https://github.com/celery/celery/pull/9023) by \@mathiasertl.

After upgrading to this version, please share your feedback on the new
Pydantic support.

#### Redis Broker Stability Improvements

The root cause of the Redis broker instability issue has been
[identified and resolved](https://github.com/celery/kombu/pull/2007) in
the v5.4.0 release of Kombu, which should resolve the disconnections bug
and offer additional improvements.

After upgrading to this version, please share your feedback on the Redis
broker stability.

Relevant Issues:
[#7276](https://github.com/celery/celery/discussions/7276),
[#8091](https://github.com/celery/celery/discussions/8091),
[#8030](https://github.com/celery/celery/discussions/8030),
[#8384](https://github.com/celery/celery/discussions/8384)

#### Quorum Queues Initial Support

This release introduces the initial support for Quorum Queues with
Celery.

See new configuration options for more details:

-   `task_default_queue_type`{.interpreted-text role="setting"}
-   `worker_detect_quorum_queues`{.interpreted-text role="setting"}

After upgrading to this version, please share your feedback on the
Quorum Queues support.

Relevant Issues:
[#6067](https://github.com/celery/celery/discussions/6067),
[#9121](https://github.com/celery/celery/discussions/9121)

### What\'s Changed

-   Added Blacksmith.sh to the Sponsors section in the README (#9323)
-   Revert \"Added Blacksmith.sh to the Sponsors section in the README\"
    (#9324)
-   Added Blacksmith.sh to the Sponsors section in the README (#9325)
-   Added missing \" " in README (#9326)
-   Use Blacksmith SVG logo (#9327)
-   Updated Blacksmith SVG logo (#9328)
-   Revert \"Updated Blacksmith SVG logo\" (#9329)
-   Update pymongo to 4.10.0 (#9330)
-   Update pymongo to 4.10.1 (#9332)
-   Update user guide to recommend delay_on_commit (#9333)
-   Pin pre-commit to latest version 4.0.0 (Python 3.9+) (#9334)
-   Update ephem to 4.1.6 (#9336)
-   Updated Blacksmith SVG logo (#9337)
-   Prepare for (pre) release: v5.5.0rc1 (#9341)

## 5.5.0b4 {#version-5.5.0b4}

release-date

:   2024-09-30

release-by

:   Tomer Nosrati

Celery v5.5.0 Beta 4 is now available for testing. Please help us test
this version and report any issues.

### Key Highlights

#### Python 3.13 Initial Support

This release introduces the initial support for Python 3.13 with Celery.

After upgrading to this version, please share your feedback on the
Python 3.13 support.

### Previous Pre-release Highlights

#### Soft Shutdown

The soft shutdown is a new mechanism in Celery that sits between the
warm shutdown and the cold shutdown. It sets a time limited \"warm
shutdown\" period, during which the worker will continue to process
tasks that are already running. After the soft shutdown ends, the worker
will initiate a graceful cold shutdown, stopping all tasks and exiting.

The soft shutdown is disabled by default, and can be enabled by setting
the new configuration option
`worker_soft_shutdown_timeout`{.interpreted-text role="setting"}. If a
worker is not running any task when the soft shutdown initiates, it will
skip the warm shutdown period and proceed directly to the cold shutdown
unless the new configuration option
`worker_enable_soft_shutdown_on_idle`{.interpreted-text role="setting"}
is set to True. This is useful for workers that are idle, waiting on ETA
tasks to be executed that still want to enable the soft shutdown
anyways.

The soft shutdown can replace the cold shutdown when using a broker with
a visibility timeout mechanism, like
`Redis <broker-redis>`{.interpreted-text role="ref"} or
`SQS <broker-sqs>`{.interpreted-text role="ref"}, to enable a more
graceful cold shutdown procedure, allowing the worker enough time to
re-queue tasks that were not completed (e.g.,
`Restoring 1 unacknowledged message(s)`) by resetting the visibility
timeout of the unacknowledged messages just before the worker exits
completely.

After upgrading to this version, please share your feedback on the new
Soft Shutdown mechanism.

Relevant Issues: [#9213](https://github.com/celery/celery/pull/9213),
[#9231](https://github.com/celery/celery/pull/9231),
[#9238](https://github.com/celery/celery/pull/9238)

-   New `documentation <worker-stopping>`{.interpreted-text role="ref"}
    for each shutdown type.
-   New `worker_soft_shutdown_timeout`{.interpreted-text role="setting"}
    configuration option.
-   New `worker_enable_soft_shutdown_on_idle`{.interpreted-text
    role="setting"} configuration option.

#### REMAP_SIGTERM

The `REMAP_SIGTERM` \"hidden feature\" has been tested,
`documented <worker-REMAP_SIGTERM>`{.interpreted-text role="ref"} and is
now officially supported. This feature allows users to remap the SIGTERM
signal to SIGQUIT, to initiate a soft or a cold shutdown using
`TERM`{.interpreted-text role="sig"} instead of `QUIT`{.interpreted-text
role="sig"}.

#### Pydantic Support

This release introduces support for Pydantic models in Celery tasks. For
more info, see the new pydantic example and PR
[#9023](https://github.com/celery/celery/pull/9023) by \@mathiasertl.

After upgrading to this version, please share your feedback on the new
Pydantic support.

#### Redis Broker Stability Improvements

The root cause of the Redis broker instability issue has been
[identified and resolved](https://github.com/celery/kombu/pull/2007) in
the v5.4.0 release of Kombu, which should resolve the disconnections bug
and offer additional improvements.

After upgrading to this version, please share your feedback on the Redis
broker stability.

Relevant Issues:
[#7276](https://github.com/celery/celery/discussions/7276),
[#8091](https://github.com/celery/celery/discussions/8091),
[#8030](https://github.com/celery/celery/discussions/8030),
[#8384](https://github.com/celery/celery/discussions/8384)

#### Quorum Queues Initial Support

This release introduces the initial support for Quorum Queues with
Celery.

See new configuration options for more details:

-   `task_default_queue_type`{.interpreted-text role="setting"}
-   `worker_detect_quorum_queues`{.interpreted-text role="setting"}

After upgrading to this version, please share your feedback on the
Quorum Queues support.

Relevant Issues:
[#6067](https://github.com/celery/celery/discussions/6067),
[#9121](https://github.com/celery/celery/discussions/9121)

### What\'s Changed

-   Correct the error description in exception message when validate
    soft_time_limit (#9246)
-   Update msgpack to 1.1.0 (#9249)
-   chore(utils/time.py): rename [\_is_ambigious]{.title-ref} -\>
    [\_is_ambiguous]{.title-ref} (#9248)
-   Reduced Smoke Tests to min/max supported python (3.8/3.12) (#9252)
-   Update pytest to 8.3.3 (#9253)
-   Update elasticsearch requirement from \<=8.15.0 to \<=8.15.1 (#9255)
-   Update mongodb without deprecated [\[srv\]]{.title-ref} extra
    requirement (#9258)
-   blacksmith.sh: Migrate workflows to Blacksmith (#9261)
-   Fixes #9119: inject dispatch_uid for retry-wrapped receivers (#9247)
-   Run all smoke tests CI jobs together (#9263)
-   Improve documentation on visibility timeout (#9264)
-   Bump pytest-celery to 1.1.2 (#9267)
-   Added missing \"app.conf.visibility_timeout\" in smoke tests (#9266)
-   Improved stability with t/smoke/tests/test_consumer.py (#9268)
-   Improved Redis container stability in the smoke tests (#9271)
-   Disabled EXHAUST_MEMORY tests in Smoke-tasks (#9272)
-   Marked xfail for test_reducing_prefetch_count with Redis - flaky
    test (#9273)
-   Fixed pypy unit tests random failures in the CI (#9275)
-   Fixed more pypy unit tests random failures in the CI (#9278)
-   Fix Redis container from aborting randomly (#9276)
-   Run Integration & Smoke CI tests together after unit tests pass
    (#9280)
-   Added \"loglevel verbose\" to Redis containers in smoke tests
    (#9282)
-   Fixed Redis error in the smoke tests: \"Possible SECURITY ATTACK
    detected\" (#9284)
-   Refactored the smoke tests github workflow (#9285)
-   Increased \--reruns 3-\>4 in smoke tests (#9286)
-   Improve stability of smoke tests (CI and Local) (#9287)
-   Fixed Smoke tests CI \"test-case\" labels (specific instead of
    general) (#9288)
-   Use assert_log_exists instead of wait_for_log in worker smoke tests
    (#9290)
-   Optimized t/smoke/tests/test_worker.py (#9291)
-   Enable smoke tests dockers check before each test starts (#9292)
-   Relaxed smoke tests flaky tests mechanism (#9293)
-   Updated quorum queue detection to handle multiple broker instances
    (#9294)
-   Non-lazy table creation for database backend (#9228)
-   Pin pymongo to latest version 4.9 (#9297)
-   Bump pymongo from 4.9 to 4.9.1 (#9298)
-   Bump Kombu to v5.4.2 (#9304)
-   Use rabbitmq:3 in stamping smoke tests (#9307)
-   Bump pytest-celery to 1.1.3 (#9308)
-   Added Python 3.13 Support (#9309)
-   Add log when global qos is disabled (#9296)
-   Added official release docs (whatsnew) for v5.5 (#9312)
-   Enable Codespell autofix (#9313)
-   Pydantic typehints: Fix optional, allow generics (#9319)
-   Prepare for (pre) release: v5.5.0b4 (#9322)

## 5.5.0b3 {#version-5.5.0b3}

release-date

:   2024-09-08

release-by

:   Tomer Nosrati

Celery v5.5.0 Beta 3 is now available for testing. Please help us test
this version and report any issues.

### Key Highlights

#### Soft Shutdown

The soft shutdown is a new mechanism in Celery that sits between the
warm shutdown and the cold shutdown. It sets a time limited \"warm
shutdown\" period, during which the worker will continue to process
tasks that are already running. After the soft shutdown ends, the worker
will initiate a graceful cold shutdown, stopping all tasks and exiting.

The soft shutdown is disabled by default, and can be enabled by setting
the new configuration option
`worker_soft_shutdown_timeout`{.interpreted-text role="setting"}. If a
worker is not running any task when the soft shutdown initiates, it will
skip the warm shutdown period and proceed directly to the cold shutdown
unless the new configuration option
`worker_enable_soft_shutdown_on_idle`{.interpreted-text role="setting"}
is set to True. This is useful for workers that are idle, waiting on ETA
tasks to be executed that still want to enable the soft shutdown
anyways.

The soft shutdown can replace the cold shutdown when using a broker with
a visibility timeout mechanism, like
`Redis <broker-redis>`{.interpreted-text role="ref"} or
`SQS <broker-sqs>`{.interpreted-text role="ref"}, to enable a more
graceful cold shutdown procedure, allowing the worker enough time to
re-queue tasks that were not completed (e.g.,
`Restoring 1 unacknowledged message(s)`) by resetting the visibility
timeout of the unacknowledged messages just before the worker exits
completely.

After upgrading to this version, please share your feedback on the new
Soft Shutdown mechanism.

Relevant Issues: [#9213](https://github.com/celery/celery/pull/9213),
[#9231](https://github.com/celery/celery/pull/9231),
[#9238](https://github.com/celery/celery/pull/9238)

-   New `documentation <worker-stopping>`{.interpreted-text role="ref"}
    for each shutdown type.
-   New `worker_soft_shutdown_timeout`{.interpreted-text role="setting"}
    configuration option.
-   New `worker_enable_soft_shutdown_on_idle`{.interpreted-text
    role="setting"} configuration option.

#### REMAP_SIGTERM

The `REMAP_SIGTERM` \"hidden feature\" has been tested,
`documented <worker-REMAP_SIGTERM>`{.interpreted-text role="ref"} and is
now officially supported. This feature allows users to remap the SIGTERM
signal to SIGQUIT, to initiate a soft or a cold shutdown using
`TERM`{.interpreted-text role="sig"} instead of `QUIT`{.interpreted-text
role="sig"}.

### Previous Pre-release Highlights

#### Pydantic Support

This release introduces support for Pydantic models in Celery tasks. For
more info, see the new pydantic example and PR
[#9023](https://github.com/celery/celery/pull/9023) by \@mathiasertl.

After upgrading to this version, please share your feedback on the new
Pydantic support.

#### Redis Broker Stability Improvements

The root cause of the Redis broker instability issue has been
[identified and resolved](https://github.com/celery/kombu/pull/2007) in
the v5.4.0 release of Kombu, which should resolve the disconnections bug
and offer additional improvements.

After upgrading to this version, please share your feedback on the Redis
broker stability.

Relevant Issues:
[#7276](https://github.com/celery/celery/discussions/7276),
[#8091](https://github.com/celery/celery/discussions/8091),
[#8030](https://github.com/celery/celery/discussions/8030),
[#8384](https://github.com/celery/celery/discussions/8384)

#### Quorum Queues Initial Support

This release introduces the initial support for Quorum Queues with
Celery.

See new configuration options for more details:

-   `task_default_queue_type`{.interpreted-text role="setting"}
-   `worker_detect_quorum_queues`{.interpreted-text role="setting"}

After upgrading to this version, please share your feedback on the
Quorum Queues support.

Relevant Issues:
[#6067](https://github.com/celery/celery/discussions/6067),
[#9121](https://github.com/celery/celery/discussions/9121)

### What\'s Changed

-   Added SQS (localstack) broker to canvas smoke tests (#9179)
-   Pin elastic-transport to \<= latest version 8.15.0 (#9182)
-   Update elasticsearch requirement from \<=8.14.0 to \<=8.15.0 (#9186)
-   Improve formatting (#9188)
-   Add basic helm chart for celery (#9181)
-   Update kafka.rst (#9194)
-   Update pytest-order to 1.3.0 (#9198)
-   Update mypy to 1.11.2 (#9206)
-   All added to routes (#9204)
-   Fix typos discovered by codespell (#9212)
-   Use tzdata extras with zoneinfo backports (#8286)
-   Use [docker compose]{.title-ref} in Contributing\'s doc build
    section (#9219)
-   Failing test for issue #9119 (#9215)
-   Fix date_done timezone issue (#8385)
-   CI Fixes to smoke tests (#9223)
-   Fix: passes current request context when pushing to request_stack
    (#9208)
-   Fix broken link in the Using RabbitMQ docs page (#9226)
-   Added Soft Shutdown Mechanism (#9213)
-   Added worker_enable_soft_shutdown_on_idle (#9231)
-   Bump cryptography from 43.0.0 to 43.0.1 (#9233)
-   Added docs regarding the relevancy of soft shutdown and ETA tasks
    (#9238)
-   Show broker_connection_retry_on_startup warning only if it evaluates
    as False (#9227)
-   Fixed docker-docs CI failure (#9240)
-   Added docker cleanup auto-fixture to improve smoke tests stability
    (#9243)
-   print is not thread-safe, so should not be used in signal handler
    (#9222)
-   Prepare for (pre) release: v5.5.0b3 (#9244)

## 5.5.0b2 {#version-5.5.0b2}

release-date

:   2024-08-06

release-by

:   Tomer Nosrati

Celery v5.5.0 Beta 2 is now available for testing. Please help us test
this version and report any issues.

### Key Highlights

#### Pydantic Support

This release introduces support for Pydantic models in Celery tasks. For
more info, see the new pydantic example and PR
[#9023](https://github.com/celery/celery/pull/9023) by \@mathiasertl.

After upgrading to this version, please share your feedback on the new
Pydantic support.

### Previous Beta Highlights

#### Redis Broker Stability Improvements

The root cause of the Redis broker instability issue has been
[identified and resolved](https://github.com/celery/kombu/pull/2007) in
the v5.4.0 release of Kombu, which should resolve the disconnections bug
and offer additional improvements.

After upgrading to this version, please share your feedback on the Redis
broker stability.

Relevant Issues:
[#7276](https://github.com/celery/celery/discussions/7276),
[#8091](https://github.com/celery/celery/discussions/8091),
[#8030](https://github.com/celery/celery/discussions/8030),
[#8384](https://github.com/celery/celery/discussions/8384)

#### Quorum Queues Initial Support

This release introduces the initial support for Quorum Queues with
Celery.

See new configuration options for more details:

-   `task_default_queue_type`{.interpreted-text role="setting"}
-   `worker_detect_quorum_queues`{.interpreted-text role="setting"}

After upgrading to this version, please share your feedback on the
Quorum Queues support.

Relevant Issues:
[#6067](https://github.com/celery/celery/discussions/6067),
[#9121](https://github.com/celery/celery/discussions/9121)

### What\'s Changed

-   Bump pytest from 8.3.1 to 8.3.2 (#9153)
-   Remove setuptools deprecated test command from setup.py (#9159)
-   Pin pre-commit to latest version 3.8.0 from Python 3.9 (#9156)
-   Bump mypy from 1.11.0 to 1.11.1 (#9164)
-   Change \"docker-compose\" to \"docker compose\" in Makefile (#9169)
-   update python versions and docker compose (#9171)
-   Add support for Pydantic model validation/serialization (fixes
    #8751) (#9023)
-   Allow local dynamodb to be installed on another host than localhost
    (#8965)
-   Terminate job implementation for gevent concurrency backend (#9083)
-   Bump Kombu to v5.4.0 (#9177)
-   Add check for soft_time_limit and time_limit values (#9173)
-   Prepare for (pre) release: v5.5.0b2 (#9178)

## 5.5.0b1 {#version-5.5.0b1}

release-date

:   2024-07-24

release-by

:   Tomer Nosrati

Celery v5.5.0 Beta 1 is now available for testing. Please help us test
this version and report any issues.

### Key Highlights

#### Redis Broker Stability Improvements

The root cause of the Redis broker instability issue has been
[identified and resolved](https://github.com/celery/kombu/pull/2007) in
the release-candidate for Kombu v5.4.0. This beta release has been
upgraded to use the new Kombu RC version, which should resolve the
disconnections bug and offer additional improvements.

After upgrading to this version, please share your feedback on the Redis
broker stability.

Relevant Issues:
[#7276](https://github.com/celery/celery/discussions/7276),
[#8091](https://github.com/celery/celery/discussions/8091),
[#8030](https://github.com/celery/celery/discussions/8030),
[#8384](https://github.com/celery/celery/discussions/8384)

#### Quorum Queues Initial Support

This release introduces the initial support for Quorum Queues with
Celery.

See new configuration options for more details:

-   `task_default_queue_type`{.interpreted-text role="setting"}
-   `worker_detect_quorum_queues`{.interpreted-text role="setting"}

After upgrading to this version, please share your feedback on the
Quorum Queues support.

Relevant Issues:
[#6067](https://github.com/celery/celery/discussions/6067),
[#9121](https://github.com/celery/celery/discussions/9121)

### What\'s Changed

-   (docs): use correct version celery v.5.4.x (#8975)
-   Update mypy to 1.10.0 (#8977)
-   Limit pymongo\<4.7 when Python \<= 3.10 due to breaking changes in
    4.7 (#8988)
-   Bump pytest from 8.1.1 to 8.2.0 (#8987)
-   Update README to Include FastAPI in Framework Integration Section
    (#8978)
-   Clarify return values of \...\_on_commit methods (#8984)
-   add kafka broker docs (#8935)
-   Limit pymongo\<4.7 regardless of Python version (#8999)
-   Update pymongo\[srv\] requirement from \<4.7,\>=4.0.2 to
    \>=4.0.2,\<4.8 (#9000)
-   Update elasticsearch requirement from \<=8.13.0 to \<=8.13.1 (#9004)
-   security: SecureSerializer: support generic low-level serializers
    (#8982)
-   don\'t kill if pid same as file (#8997) (#8998)
-   Update cryptography to 42.0.6 (#9005)
-   Bump cryptography from 42.0.6 to 42.0.7 (#9009)
-   Added -vv to unit, integration and smoke tests (#9014)
-   SecuritySerializer: ensure pack separator will not be conflicted
    with serialized fields (#9010)
-   Update sphinx-click to 5.2.2 (#9025)
-   Bump sphinx-click from 5.2.2 to 6.0.0 (#9029)
-   Fix a typo to display the help message in first-steps-with-django
    (#9036)
-   Pinned requests to v2.31.0 due to docker-py bug #3256 (#9039)
-   Fix certificate validity check (#9037)
-   Revert \"Pinned requests to v2.31.0 due to docker-py bug #3256\"
    (#9043)
-   Bump pytest from 8.2.0 to 8.2.1 (#9035)
-   Update elasticsearch requirement from \<=8.13.1 to \<=8.13.2 (#9045)
-   Fix detection of custom task set as class attribute with Django
    (#9038)
-   Update elastic-transport requirement from \<=8.13.0 to \<=8.13.1
    (#9050)
-   Bump pycouchdb from 1.14.2 to 1.16.0 (#9052)
-   Update pytest to 8.2.2 (#9060)
-   Bump cryptography from 42.0.7 to 42.0.8 (#9061)
-   Update elasticsearch requirement from \<=8.13.2 to \<=8.14.0 (#9069)
-   \[enhance feature\] Crontab schedule: allow using month names
    (#9068)
-   Enhance tox environment: \[testenv:clean\] (#9072)
-   Clarify docs about Reserve one task at a time (#9073)
-   GCS docs fixes (#9075)
-   Use hub.remove_writer instead of hub.remove for write fds (#4185)
    (#9055)
-   Class method to process crontab string (#9079)
-   Fixed smoke tests env bug when using integration tasks that rely on
    Redis (#9090)
-   Bugfix - a task will run multiple times when chaining chains with
    groups (#9021)
-   Bump mypy from 1.10.0 to 1.10.1 (#9096)
-   Don\'t add a separator to global_keyprefix if it already has one
    (#9080)
-   Update pymongo\[srv\] requirement from \<4.8,\>=4.0.2 to
    \>=4.0.2,\<4.9 (#9111)
-   Added missing import in examples for Django (#9099)
-   Bump Kombu to v5.4.0rc1 (#9117)
-   Removed skipping Redis in t/smoke/tests/test_consumer.py tests
    (#9118)
-   Update pytest-subtests to 0.13.0 (#9120)
-   Increased smoke tests CI timeout (#9122)
-   Bump Kombu to v5.4.0rc2 (#9127)
-   Update zstandard to 0.23.0 (#9129)
-   Update pytest-subtests to 0.13.1 (#9130)
-   Changed retry to tenacity in smoke tests (#9133)
-   Bump mypy from 1.10.1 to 1.11.0 (#9135)
-   Update cryptography to 43.0.0 (#9138)
-   Update pytest to 8.3.1 (#9137)
-   Added support for Quorum Queues (#9121)
-   Bump Kombu to v5.4.0rc3 (#9139)
-   Cleanup in Changelog.rst (#9141)
-   Update Django docs for CELERY_CACHE_BACKEND (#9143)
-   Added missing docs to previous releases (#9144)
-   Fixed a few documentation build warnings (#9145)
-   docs(README): link invalid (#9148)
-   Prepare for (pre) release: v5.5.0b1 (#9146)