Migrating to FastAPI 0.129.2
Version 0.129.2 introduces 1 breaking change. This guide details how to update your code.
Released: 2/21/2026
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Breaking Changes
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Migration Steps
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Affected Symbols
Breaking Changes
●Issue #1
Support for the `fastapi-slim` package has been dropped. Users relying on this specific package should switch to installing either `"fastapi[standard]"` or just `fastapi`.
Migration Steps
- 1If you were using `fastapi-slim`, change your installation command to use `fastapi[standard]` or `fastapi`.
Release Summary
This release drops support for the `fastapi-slim` package and updates internal tooling, including an upgrade to pytest.
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View the full release notes and all changes for FastAPI 0.129.2.
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