FastAPI 0.155.0 removes deprecated **extra request-parameter arguments

1. FastAPI latest news

FastAPI 0.154.0 adds Pydantic validation options to request parameters

The stable GitHub release published at 00:47 on October 21 in Korea and its PyPI distribution files were verified. This feature release adds Pydantic validation options to request parameters (PR16542). Developers configuring request-input validation should review the options they use and their existing validation tests after upgrading.

Announced2026-10-20T15:47:36Z

https://github.com/fastapi/fastapi/releases/tag/0.154.0

https://pypi.org/project/fastapi/0.154.0/

https://github.com/fastapi/fastapi/pull/16542

FastAPI 0.155.0 removes deprecated **extra request-parameter arguments

The October 21 Korean-date stable release and PyPI distribution were verified. Deprecated **extra keyword arguments were removed from Path, Query, Header, Cookie, Body, Form, and File; unknown arguments now raise TypeError. Move additional JSON Schema properties from Query(custom="value") to Query(json_schema_extra={"custom": "value"}), for example. Check custom arguments and related validation tests before upgrading.

Announced2026-10-20T16:46:55Z

https://github.com/fastapi/fastapi/releases/tag/0.155.0

https://pypi.org/project/fastapi/0.155.0/

https://github.com/fastapi/fastapi/pull/16545

AI collected, translated, and edited this news after checking the official sources.