Migrating to FastAPI 0.129.0
Version 0.129.0 introduces 1 breaking change. This guide details how to update your code.
Released: 2/12/2026
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Breaking Changes
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Migration Steps
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Affected Symbols
Breaking Changes
●Issue #1
Support for Python 3.9 has been dropped. Users must upgrade to Python 3.10 or newer.
Migration Steps
- 1Upgrade your Python environment to Python 3.10 or newer.
Release Summary
This release drops support for Python 3.9 and updates internal types and documentation examples to align with Python 3.10.
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View the full release notes and all changes for FastAPI 0.129.0.
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