Sourced from mypy's changelog.

Mypy Release Notes

Next Release

Mypy 2.1

We’ve just uploaded mypy 2.1.0 to the Python Package Index (PyPI). Mypy is a static type checker for Python. This release includes new features, performance improvements and bug fixes. You can install it as follows:

python3 -m pip install -U mypy

You can read the full documentation for this release on Read the Docs.

librt.vecs: Fast Growable Array Type for Mypyc

The new librt.vecs module provides an efficient growable array type vec that is optimized for mypyc use. It provides fast, packed arrays with integer and floating point value types, which can be several times faster than list, and tens of times faster than array.array in code compiled using mypyc. It also supports nested vec objects and non-value-type items, such as vec[vec[str]].

Refer to the documentation for the details.

Contributed by Jukka Lehtosalo.

librt.random: Fast Pseudo-Random Number Generation

The new librt.random module provides fast pseudo-random number generation that is optimized for code compiled using mypyc. It can be 3x to 10x faster than the stdlib random module in compiled code.

Refer to the documentation for the details.

Contributed by Jukka Lehtosalo (PR 21433).

Mypyc Improvements

• Enable incremental self-compilation (Vaggelis Danias, PR 21369)
• Make compilation order with multiple files consistent (Piotr Sawicki, PR 21419)
• Fix crash on accessing StopAsyncIteration (Piotr Sawicki, PR 21406)
• Fix incremental compilation with separate flag (Vaggelis Danias, PR 21299)

Fixes to Crashes

• Fix crash on partial type with --allow-redefinition and global declaration (Jukka Lehtosalo, PR 21428)
• Fix broken awaitable generator patching (Ivan Levkivskyi, PR 21435)

... (truncated)

• c1c336d Remove +dev from version
• 74df14b Add changelog for mypy 2.1 (#21464)
• 022d9bc Revert "TypeForm: Enable by default (#21262)"
• 8826288 [mypyc] Document librt.random (#21463)
• 3f4067b Bump librt version to 0.11.0 (#21458)
• 2b1eb58 [mypyc] Enable incremental self-compilation (#21369)
• 8152f4a Respect file config comments for stale modules (#21444)
• 116d60b Fix nondeterminism from nonassociativity of overload joins (#21455)
• 6c4af8e Fix function call message change for small number of args (#21432)
• 4b8fdca [mypyc] Add librt.random module (#21433)
• Additional commits viewable in compare view

• 509391a Pyright NPM Package update to 1.1.410 (#361)
• See full diff in compare view

Sourced from ruff's releases.

0.15.16

Release Notes

Released on 2026-06-04.

Preview features

• [flake8-async] Implement yield-in-context-manager-in-async-generator (ASYNC119) (#24644)
• [pylint] Narrow diagnostic range and exclude cases without exception handlers (PLW0717) (#25440)
• [ruff] Treat yield before break from a terminal loop as terminal (RUF075) (#25447)

Bug fixes

• [eradicate] Avoid flagging ruff:ignore comments as code (ERA001) (#25537)
• [eradicate] Fix ERA001/RUF100 conflict when noqa is on commented-out code (#25414)
• [pyflakes] Avoid removing the format call when it would change behavior (F523) (#25320)
• [pylint] Avoid syntax errors in invalid character replacements in f-strings before Python 3.12 (PLE2510, PLE2512, PLE2513, PLE2514, PLE2515) (#25544)
• [pyupgrade] Avoid converting format calls with more kinds of side effects (UP032) (#25484)

Rule changes

• [flake8-pytest-style] Avoid fixes for ambiguous argnames and argvalues combinations (PT006) (#24776)

Performance

• Drop excess capacity from statement suites during parsing (#25368)

Documentation

• [pydocstyle] Improve discoverability of rules enabled for each convention (#24973)
• [ruff] Restore example code for Python versions before 3.15 (RUF017) (#25439)
• Fix typo bin/active → bin/activate in tutorial (#25473)

Other changes

• Shrink additional parser AST collections (#25465)

Contributors

• @​Redslayer112
• @​koriyoshi2041
• @​George-Ogden
• @​TejasAmle
• @​anishgirianish
• @​ntBre
• @​MichaReiser
• @​loganrosen
• @​RafaelJohn9
• @​adityasingh2400

... (truncated)

Sourced from ruff's changelog.

0.15.16

Released on 2026-06-04.

Preview features

• [flake8-async] Implement yield-in-context-manager-in-async-generator (ASYNC119) (#24644)
• [pylint] Narrow diagnostic range and exclude cases without exception handlers (PLW0717) (#25440)
• [ruff] Treat yield before break from a terminal loop as terminal (RUF075) (#25447)

Bug fixes

• [eradicate] Avoid flagging ruff:ignore comments as code (ERA001) (#25537)
• [eradicate] Fix ERA001/RUF100 conflict when noqa is on commented-out code (#25414)
• [pyflakes] Avoid removing the format call when it would change behavior (F523) (#25320)
• [pylint] Avoid syntax errors in invalid character replacements in f-strings before Python 3.12 (PLE2510, PLE2512, PLE2513, PLE2514, PLE2515) (#25544)
• [pyupgrade] Avoid converting format calls with more kinds of side effects (UP032) (#25484)

Rule changes

• [flake8-pytest-style] Avoid fixes for ambiguous argnames and argvalues combinations (PT006) (#24776)

Performance

• Drop excess capacity from statement suites during parsing (#25368)

Documentation

• [pydocstyle] Improve discoverability of rules enabled for each convention (#24973)
• [ruff] Restore example code for Python versions before 3.15 (RUF017) (#25439)
• Fix typo bin/active → bin/activate in tutorial (#25473)

Other changes

• Shrink additional parser AST collections (#25465)

Contributors

• @​Redslayer112
• @​koriyoshi2041
• @​George-Ogden
• @​TejasAmle
• @​anishgirianish
• @​ntBre
• @​MichaReiser
• @​loganrosen
• @​RafaelJohn9
• @​adityasingh2400

0.15.15

... (truncated)

• 6c498ab Bump 0.15.16 (#25635)
• e51e132 [flake8-async] Implement yield-in-context-manager-in-async-generator (`AS...
• 7c6dcd9 [ty] Add caching for pattern match narrowing (#25613)
• 27058fc [ty] Compact retained definition and expression identities (#25606)
• bf80d05 Fix CODEOWNERS syntax (#25622)
• 10ccd51 Shrink additional parser AST collections (#25465)
• 0d7135f [ty] Upgrade Salsa (#25545)
• 49493a3 [ty] Show type alias value on hover (#25381)
• 85207d3 [ty] sys.implementation.version is not sys.version_info (#25608)
• a8a0614 [ty] Avoid retaining duplicate function signatures (#25609)
• Additional commits viewable in compare view

Sourced from prek's releases.

0.4.4

Release Notes

Released on 2026-06-04.

✨ Highlights

0.4.4 makes prek run easier to watch and easier to slice.

Hook stream output now shows a small live preview under the running hook in the progress UI. Long-running hooks no longer look stuck while they are producing logs, and failed hooks are easier to diagnose because recent output is already visible before the final result.

The new group selector lets a single config support different workflows. Tag hooks with groups, then select or exclude those groups at run time:

repos:
  - repo: local
    hooks:
      - id: format
        name: Format Python
        language: system
        entry: ruff format
        groups: [format, ci]
  - id: lint
    name: Lint Python
    language: system
    entry: ruff check
    groups: [lint, ci]

prek run --all-files --group ci
prek run --all-files --no-group format

This is useful when local development, CI, slow validation, or project-specific checks need different hook sets without splitting the config.

💚 Sponsorship

If prek saves time for you or your team, please consider sponsoring the project on GitHub Sponsors. It helps keep new features, performance work, and maintenance moving.

Enhancements

... (truncated)

Sourced from prek's changelog.

0.4.4

Released on 2026-06-04.

Highlights

0.4.4 makes prek run easier to watch and easier to slice.

Hook stream output now shows a small live preview under the running hook in the progress UI. Long-running hooks no longer look stuck while they are producing logs, and failed hooks are easier to diagnose because recent output is already visible before the final result.

The new group selector lets a single config support different workflows. Tag hooks with groups, then select or exclude those groups at run time:

repos:
  - repo: local
    hooks:
      - id: format
        name: Format Python
        language: system
        entry: ruff format
        groups: [format, ci]
  - id: lint
    name: Lint Python
    language: system
    entry: ruff check
    groups: [lint, ci]

prek run --all-files --group ci
prek run --all-files --no-group format

This is useful when local development, CI, slow validation, or project-specific checks need different hook sets without splitting the config.

Enhancements

• Add hook group filters to prek run (#2141)
• Delay hook output preview rendering (#2140)
• Stream hook output in progress UI (#2136)

Bug fixes

• Fix intent-to-add stash restore (#2143)

... (truncated)

• f44270e Bump version 0.4.4 (#2148)
• da457c5 Document hook stage file input (#2147)
• 0fa2929 Add hook group filters to prek run (#2141)
• 9b0047f Fix intent-to-add stash restore (#2143)
• 00b2520 Delay hook output preview rendering (#2140)
• a54fdf0 Simplify hook output preview rendering (#2139)
• ab7165d Stream hook output in progress UI (#2136)
• f609584 Remove unpinned dotnet test (#2137)
• ce0d8b3 Update Rust to 1.96 (#2134)
• 1815fc5 Update PyPI Downloads badge to dynamic JSON
• Additional commits viewable in compare view

Sourced from pytest-asyncio's releases.

pytest-asyncio v1.4.0

1.4.0 - 2026-05-26

Deprecated

• Overriding the event_loop_policy fixture is deprecated. Use the pytest_asyncio_loop_factories hook instead. (#1419)

Added

• Added the pytest_asyncio_loop_factories hook to parametrize asyncio tests with custom event loop factories.

  The hook returns a mapping of factory names to loop factories, and pytest.mark.asyncio(loop_factories=[...]) selects a subset of configured factories per test. When a single factory is configured, test names are unchanged.

  Synchronous @pytest_asyncio.fixture functions now see the correct event loop when custom loop factories are configured, even when test code disrupts the current event loop (e.g., via asyncio.run() or asyncio.set_event_loop(None)). (#1164)

Changed

• Improved the readability of the warning message that is displayed when asyncio_default_fixture_loop_scope is unset (#1298)
• Only import asyncio.AbstractEventLoopPolicy for type checking to avoid raising a DeprecationWarning. (#1394)
• Updated minimum supported pytest version to v8.4.0. (#1397)

Fixed

• Fixed a ResourceWarning: unclosed event loop warning that could occur when a synchronous test called asyncio.run() or otherwise unset the current event loop after pytest-asyncio had run an async test or fixture. (#724)

Notes for Downstream Packagers

• Added dependency on sphinx-tabs >= 3.5 to organize documentation examples into tabs. (#1395)

• 6e14cd2 chore: Prepare release of v1.4.0.
• 4b900fb Build(deps): Bump codecov/codecov-action from 6.0.0 to 6.0.1
• ab9f632 Build(deps): Bump zipp from 3.23.1 to 4.1.0
• a56fc77 Build(deps): Bump hypothesis from 6.152.6 to 6.152.8
• e8bae9b Build(deps): Bump requests from 2.34.0 to 2.34.2
• fc43340 Build(deps): Bump idna from 3.14 to 3.15
• 762eaf5 Build(deps): Bump jaraco-functools from 4.4.0 to 4.5.0
• b62e222 Build(deps): Bump click from 8.3.3 to 8.4.0
• 9190447 Build(deps): Bump pydantic from 2.13.3 to 2.13.4
• 82a393c ci: Remove unnecessary debug output.
• Additional commits viewable in compare view