0.29.0 (2026-05-30)

Breaking Changes

• Drop support for Python 3.10
• Raise minimum httpx version to 0.23.1

Features

• replace python-dateutil with stdlib datetime.fromisoformat (#1429)

Fixes

• Remove some generated casts that aren't necessary with mypy v2 (#1436)
• Explicitly set boundary for multipart/form-data (#1005)

0.28.4 (2026-05-11)

Features

• Update uv_build to 0.11 when using --meta=uv (#1434)

Add support for x-enum-varnames to string enums

#1358 by @mbbush

You can now customize the variable names of the generated string enumerations using the x-enum-varnames openapi extension. Previously, this was only possible for integer enumerations.

0.28.3 (2026-02-17)

Fixes

• sort remaining lazy imports in model template (#1400)

0.28.2 (2026-02-09)

Features

• Update uv_build 0.10 when using --meta=uv (#1396)

0.28.1 (2026-01-10)

Fixes

• Apply required overrides from allOf schemas (#1384)
• Sort lazy imports to increase stability of generated code (#1378)

0.28.0 (2025-12-03)

Breaking Changes

• URL-encode path parameters in generated endpoints (#1349)

Fixes

Fix bad code generation

#1360 by @EricAtORS

This fixes:

• missing parenthesis in to_multipart
  #1338 #1318
• missing imports in the lazy eval in to_multipart:
  #931 and #1051

Fix optional bodies

If a body is not required (the default), it will now:

1. Have Unset as part of its type annotation.
2. Default to a value of UNSET
3. Not be included in the request if it is UNSET

Thanks @orelmaliach for the report! Fixes #1354

0.27.1 (2025-11-03)

Fixes

• Remove non-existent CHANGELOG.md references from UV and Poetry templates (#1344)
• Initialize optional lists as UNSET, not [] (#1346)
• Correct docstring typos in client template (#1347)
• Replace bare except blocks with specific exception types (#1348)

Update uv_build to 0.9

#1352 by @johnthagen

uv has been in the 0.9.x release cycle for a while, so update templates to use the corresponding uv_build range.

0.27.0 (2025-10-28)

Breaking Changes

Drop support for Python 3.9

Both openapi-python-client itself and any generated clients no longer support Python 3.9.

Generated models now use from __future__ import annotations

This simplifies using forward references with the newer union syntax.

Features

Upgrade generated clients to 3.10 union syntax

All generated types now use the A | B syntax instead of Union[A, B] or Optional[A].

Fixes

• Drop generated requires-python upper bounds for uv and PDM (#1329)

Change default Ruff hook to --fix-only

This should enable openapi-python-client to keep auto-fixing lints (like removing unused imports) but not fail to
generate when unfixable lints are violated.

Since it's now unlikely for breaking changes to affect our usage (and by popular request), the upper bound of ruff
has been lifted. Newer versions of openapi-python-client should no longer be required to support newer versions of ruff.

Notes

• Minimum Typer version is now 0.16

0.26.2 (2025-10-06)

Fixes

• ambigious tilde specifier requires-python with--meta=uv (#1321)

0.26.1 (2025-09-13)

Features

• Reference schema support (#800) (#1307)
• Support Ruff 0.13