Who contributed to FastAPI & Pydantic on August 5, 2026?

4 developers shipped this update, including dependabot, Viicos, dmontagu, and Michael Berdyshev.

What were the notable FastAPI & Pydantic updates?

Introduce micro-optimizations for model class building, ⬆ Bump cryptography from 48.0.1 to 50.0.0, and ⬆ Bump gitpython from 3.1.54 to 3.1.57.

FastAPI & Pydantic

FastAPI and the Pydantic + SQLModel async-Python stack

Pick a date

Topics: Python Full archive →

The Wire · Showcase

PYDANTIC TUNES MODEL BUILDING FOR SPEED WHILE FASTAPI HARDENS CRYPTO

By RepoJournal · Filed 07:00 UTC on August 5, 2026 · About FastAPI & Pydantic

4 people shipped this

dependabot @dependabot 2 cited

Viicos @Viicos 2 cited

dmontagu @dmontagu 1 cited

Michael Berdyshev @mberdyshev 1 cited

Pydantic ships three micro-optimizations on the hot path of model class building, cutting unnecessary iterations and getattr calls that fire on every field.

The biggest move comes from dmontagu's optimization suite [1], which cuts ConfigWrapper iteration from all 29 possible CoreConfig keys down to just the user's actual config, adds a fast path for empty configs, and strips redundant getattr calls that used to hit BaseModel up to 16 times per field. Meanwhile, Viicos is splitting the massive test_types.py into dedicated files and migrating to TypeAdapter [5], cleaning up the test surface and making future changes easier to track. On the FastAPI side, dependabot landed cryptography 50.0.0 [2], which hardens PKCS7 decryption against timing attacks. GitPython also moved to 3.1.57 [3] with security and stability improvements. Pydantic's test migration work continues with a separate effort to move pydantic-core tests into the main directory [4], removing symlinks and adopting the Pythonic API across the board. A final addition brings AllowInfNan type support to field metadata gathering [6]. Activity across both repos: 5 commits, 7 PRs.

Action items

→ Review and merge the model building optimizations [ref:4] if you maintain Pydantic deployments at scale pydantic/pydantic [plan]
→ Update cryptography to 50.0.0 [ref:1] in FastAPI projects that handle encrypted sessions fastapi/fastapi [plan]
→ Monitor pydantic-core test migration [ref:3] for test stability as the suite reorganizes pydantic/pydantic [monitor]

References

[1] Introduce micro-optimizations for model class building ↗ pydantic/pydantic
[2] ⬆ Bump cryptography from 48.0.1 to 50.0.0 ↗ fastapi/fastapi
[3] ⬆ Bump gitpython from 3.1.54 to 3.1.57 ↗ fastapi/fastapi
[4] Migrate `pydantic-core` tests to main tests directory ↗ pydantic/pydantic
[5] Split stdlib types tests into dedicated test files ↗ pydantic/pydantic
[6] Add `AllowInfNan` type to the field metadata gathering (#13586) pydantic/pydantic

Quick answers

What shipped in FastAPI & Pydantic on August 5, 2026?: Pydantic ships three micro-optimizations on the hot path of model class building, cutting unnecessary iterations and getattr calls that fire on every field. In total, 5 commits and 7 pull requests landed.
Who contributed to FastAPI & Pydantic on August 5, 2026?: 4 developers shipped this update, including dependabot, Viicos, dmontagu, and Michael Berdyshev.
What were the notable FastAPI & Pydantic updates?: Introduce micro-optimizations for model class building, ⬆ Bump cryptography from 48.0.1 to 50.0.0, and ⬆ Bump gitpython from 3.1.54 to 3.1.57.

PYDANTIC TIGHTENS NAMED TUPLE VALIDATION, FASTAPI PULLS 12 DEPENDENCY UPDATES

Pydantic ships a dedicated named-tuple core schema that fixes four critical validation edge cases, while FastAPI and SQLModel ride a wave of upstream bumps across the toolchain.

python 8 shipped

FastAPI & Pydantic Aug 4

PYDANTIC TACKLES CORE SCHEMA PERFORMANCE WHILE FASTAPI DOCS GET A UI FIX

Pydantic shipped optimizations that cut type lookup overhead in core schema generation, while both FastAPI and SQLModel standardized their documentation controls across 13 commits and 17 PRs overnight.

python 30 shipped

FastAPI & Pydantic Aug 3

PYDANTIC MAINTENANCE SWEEP TACKLES DEPENDENCY CHAIN

Five dependency updates landed in Pydantic's CI pipeline overnight, signaling a coordinated push to keep the build toolchain current across Python, Node, and package publishing workflows.

python 5 shipped

FastAPI & Pydantic Aug 2

PYDANTIC FIXES `field_title_generator` SIGNATURE MISMATCH

The documented signature for `field_title_generator` was wrong, and developers following the docs would hit a TypeError.

python 2 shipped

Elsewhere on the wire

AI Agents Aug 6

LANGCHAIN HARDENS ANTHROPIC TOOL CALLING AND GIT CREDENTIALS AS OPENHANDS SHIPS 1.10.0

LangChain fixed a critical credential leak in evaluation runs while Anthropic tool schemas get proper fallback handling, as three major agent frameworks push releases across the ecosystem.

ai-agents 54 shipped

Local LLMs Aug 6

OLLAMA FIXES KV CACHE CORRUPTION, LLAMA.CPP HARDENS FILE SEARCH, VLLM KILLS MOE LEGACY CODE

Ollama patched a critical cache corruption bug that corrupts lazy snapshots during multi-request prefills, while llama.cpp hardened Windows junction traversal and vLLM removed 14 hardcoded MoE shards across quantization methods.