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FastAPI & Pydantic FastAPI & Pydantic
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wire 2026-07-07
stories 13
RSS Archive Reviews

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$ the-wire ยท showcase

PYDANTIC PATCHES JSON SCHEMA BUG AS FASTAPI SPONSORS EXPAND

By RepoJournal ยท Filed ยท About FastAPI & Pydantic ยท Composed from the cited sources ยท methodology

dependabot[bot] Kropiunig
2 people shipped this
dependabot[bot] @dependabot[bot] 2 cited Kropiunig @Kropiunig 1 cited

Pydantic fixed a critical issue where json_schema_extra dicts were silently dropped when followed by callables in Annotated types, a bug that could break schema generation in production.

The fix [1] restores proper handling of json_schema_extra configuration when mixed with callable validators, ensuring your schemas generate correctly. This was paired with a docstring cleanup [2] that removed duplicate parameter descriptions from TypeAdapter.json_schema, clearing up confusion for developers building custom serialization logic. On the infrastructure side, Pydantic's CI pipeline bumped actions/checkout to 7.0.0 [3], which now blocks potentially unsafe fork PR checkouts in pull_request_target workflows, a security hardening that matters if you run untrusted code in CI. The team also updated setup-uv to 8.2.0 [4], adding quiet mode and mirror configuration options for faster, leaner test runs. Over in FastAPI, the project onboarded TutorCruncher as a sponsor [5], signaling continued momentum for the framework's ecosystem.

$ ls fastapi/reviews/ # the step-back reads

the week in review Pydantic drops Python 3.10, then layers serialization fast paths the month in review Five Pydantic validation bypasses and a quadratic URL check
Full archive โ†’ Weekly reviews โ†’

Quick answers

What shipped in FastAPI & Pydantic on July 7, 2026?
Pydantic fixed a critical issue where json_schema_extra dicts were silently dropped when followed by callables in Annotated types, a bug that could break schema generation in production. In total, 4 commits and 9 pull requests landed.
Who contributed to FastAPI & Pydantic on July 7, 2026?
2 developers shipped this update, including Kropiunig and dependabot[bot].
What were the notable FastAPI & Pydantic updates?
Fix `json_schema_extra` dict being dropped when a callable follows it in `Annotated` (#13374), Remove duplicated `schema_generator` and `mode` entries in `TypeAdapter.json_schema` docstring, and Bump actions/checkout from 6.0.2 to 7.0.0.
โ™ฅ

$ log FastAPI & Pydantic --recent

Pydantic fixes GC tracking in pydantic-core and caches UTC TzInfo 50 shipped Pydantic drops Python 3.10, accepts list and DecimalTuple for Decimal 37 shipped Pydantic reworks `TypeAdapter` call arguments, tightens `Decimal` schemas 13 shipped FastAPI bumps pillow and dnspython, Pydantic corrects arguments JSON Schema 6 shipped

$ log --all # elsewhere on the wire

Agent Security Quiet day in agent security as guard coverage reaches four clients Alignment & Post-training verl defaults Ascend RL mode, open-instruct unblocks SFT packing

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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