●Change8

Migrating to FastAPI 0.125.0

Version 0.125.0 introduces 1 breaking change. This guide details how to update your code.

Released: 12/17/2025

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Breaking Changes
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Migration Steps
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Affected Symbols

⚠️ Check Your Code

If you use any of these symbols, you need to read this guide:

python

Breaking Changes

●Issue #1

Dropped support for Python 3.8. Users on Python 3.8 will be unable to install this version and will be pinned to 0.124.4.

Migration Steps

  1. 1
    If you are using Python 3.8, pin your dependency to fastapi==0.124.4.

Release Summary

This release drops support for Python 3.8 and upgrades the internal codebase to Python 3.9+ syntax. It also includes significant updates to documentation translations and the CI pipeline for LLM-assisted localization.

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View the full release notes and all changes for FastAPI 0.125.0.

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