# October 23, 2025

## 3.9.2

**`(fix):`** Fix nullable field serialization in PATCH requests with wrapped request bodies. Explicit null values
(Nullable.ofNull()) are now correctly serialized as `{"field": null}` instead of being omitted like
Nullable.empty().

## 3.9.1

**`(fix):`** Fix raw client methods to return union types instead of first variant when using response
properties (x-fern-sdk-return-value) with discriminated or undiscriminated unions.