Who contributed to FastAPI & Pydantic on August 13, 2026?

3 developers shipped this update, including tiangolo, latest-changes[bot], and Viicos.

What were the notable FastAPI & Pydantic updates?

Do not error on unhashable generic aliases during core schema generation, Bump `click` to v8.4.2, and Workaround circular import error in Mypy.

FastAPI & Pydantic

FastAPI and the Pydantic + SQLModel async-Python stack

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PYDANTIC FIXES GENERIC ALIAS CRASHES, SQLMODEL AND FASTAPI MIGRATE LABEL INFRASTRUCTURE

By RepoJournal · Filed 07:00 UTC on August 13, 2026 · About FastAPI & Pydantic

3 people shipped this

Viicos @Viicos 5 cited

tiangolo @tiangolo 4 cited

latest-changes[bot] @latest-changes[bot]

Pydantic shipped fixes for unhashable generic aliases that were causing core schema generation to error [ref:8], while both FastAPI and SQLModel overhauled their release note automation.

The main signal today comes from the Pydantic desk, where Viicos landed a critical fix [1] that stops Pydantic from erroring on unhashable generic aliases during core schema generation, resolving a reported issue [1]. The same contributor also bumped Click to v8.4.2 [2] to close a dependency concern and worked around a circular import error in Mypy that was causing test failures [3]. Over on the FastAPI and SQLModel side, tiangolo completed infrastructure work across both repos, migrating automatic label generation to the Latest Changes system [4] [5] [6] [7]. This is housekeeping that improves maintainability for release tracking, though it doesn't change runtime behavior. The Pyodide lockfile also got a refresh [8] [9] to keep browser-based tooling current.

Action items

→ Review Pydantic PRs 13648 and 13640 if you use generic aliases or type hints in validation pydantic/pydantic [plan]
→ No immediate action needed for FastAPI/SQLModel; infrastructure changes are transparent fastapi/fastapi [monitor]

References

[1] Do not error on unhashable generic aliases during core schema generation ↗ pydantic/pydantic
[2] Bump `click` to v8.4.2 ↗ pydantic/pydantic
[3] Workaround circular import error in Mypy ↗ pydantic/pydantic
[4] 👷 Migrate automatic labels to Latest Changes ↗ fastapi/fastapi
[5] 👷 Migrate automatic labels to Latest Changes (#16185) fastapi/fastapi
[6] 👷 Migrate automatic labels to Latest Changes ↗ tiangolo/sqlmodel
[7] 👷 Migrate automatic labels to Latest Changes (#2074) tiangolo/sqlmodel
[8] Update Pyodide lockfile ↗ pydantic/pydantic
[9] Update Pyodide lockfile (#13649) pydantic/pydantic

Quick answers

What shipped in FastAPI & Pydantic on August 13, 2026?: Pydantic shipped fixes for unhashable generic aliases that were causing core schema generation to error [ref:8], while both FastAPI and SQLModel overhauled their release note automation. In total, 8 commits and 6 pull requests landed.
Who contributed to FastAPI & Pydantic on August 13, 2026?: 3 developers shipped this update, including tiangolo, latest-changes[bot], and Viicos.
What were the notable FastAPI & Pydantic updates?: Do not error on unhashable generic aliases during core schema generation, Bump `click` to v8.4.2, and Workaround circular import error in Mypy.

PYDANTIC PATCHES PYODIDE LOCKFILE DEPENDENCY

Pydantic fixed a Pyodide lockfile issue that was blocking WebAssembly builds.

python 2 shipped

FastAPI & Pydantic Aug 12

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python 9 shipped

FastAPI & Pydantic Aug 11

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python 24 shipped

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