# Pydantic v2.13.5

- Product: Pydantic (https://whatsnew.fyi/product/pydantic)
- Vendor: Pydantic
- Date: 2026-08-28
- Version: v2.13.5
- Original notes: https://github.com/pydantic/pydantic/releases/tag/v2.13.5
- Permalink: https://whatsnew.fyi/product/pydantic/releases/v2.13.5

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- **fixed** — Allow reuse of validators when plugins are set
- **fixed** — Fix missing GC traversal on some pydantic-core struct fields
- **fixed** — Fix missing GC traversal in pydantic-core for GeneralFieldsSerializer
- **fixed** — Count validated model fields once in smart unions

##### v2.13.5 (2026-08-28)

###### What's Changed

###### Fixes

* Allow reuse of validators when plugins are set by @Viicos in [#13535](https://github.com/pydantic/pydantic/pull/13535)
* Fix missing GC traversal on some `pydantic-core` struct fields by @Viicos in [#13624](https://github.com/pydantic/pydantic/pull/13624)
* Fix missing GC traversal in `pydantic-core` for `GeneralFieldsSerializer` by @Viicos in [#13629](https://github.com/pydantic/pydantic/pull/13629)
* Count validated model fields once in smart unions by @tamird in [#13731](https://github.com/pydantic/pydantic/pull/13731)