Sourced from ruff's releases.

0.14.7

Release Notes

Released on 2025-11-28.

Preview features

• [flake8-bandit] Handle string literal bindings in suspicious-url-open-usage (S310) (#21469)
• [pylint] Fix PLR1708 false positives on nested functions (#21177)
• [pylint] Fix suppression for empty dict without tuple key annotation (PLE1141) (#21290)
• [ruff] Add rule RUF066 to detect unnecessary class properties (#21535)
• [ruff] Catch more dummy variable uses (RUF052) (#19799)

Bug fixes

• [server] Set severity for non-rule diagnostics (#21559)
• [flake8-implicit-str-concat] Avoid invalid fix in (ISC003) (#21517)
• [parser] Fix panic when parsing IPython escape command expressions (#21480)

CLI

• Show partial fixability indicator in statistics output (#21513)

Contributors

• @​mikeleppane
• @​senekor
• @​ShaharNaveh
• @​JumboBear
• @​prakhar1144
• @​tsvikas
• @​danparizher
• @​chirizxc
• @​AlexWaygood
• @​MichaReiser

Install ruff 0.14.7

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/ruff/releases/download/0.14.7/ruff-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/ruff/releases/download/0.14.7/ruff-installer.ps1 | iex"

... (truncated)

Sourced from ruff's changelog.

0.14.7

Released on 2025-11-28.

Preview features

• [flake8-bandit] Handle string literal bindings in suspicious-url-open-usage (S310) (#21469)
• [pylint] Fix PLR1708 false positives on nested functions (#21177)
• [pylint] Fix suppression for empty dict without tuple key annotation (PLE1141) (#21290)
• [ruff] Add rule RUF066 to detect unnecessary class properties (#21535)
• [ruff] Catch more dummy variable uses (RUF052) (#19799)

Bug fixes

• [server] Set severity for non-rule diagnostics (#21559)
• [flake8-implicit-str-concat] Avoid invalid fix in (ISC003) (#21517)
• [parser] Fix panic when parsing IPython escape command expressions (#21480)

CLI

• Show partial fixability indicator in statistics output (#21513)

Contributors

• @​mikeleppane
• @​senekor
• @​ShaharNaveh
• @​JumboBear
• @​prakhar1144
• @​tsvikas
• @​danparizher
• @​chirizxc
• @​AlexWaygood
• @​MichaReiser

• ecab623 Bump 0.14.7 (#21684)
• 42f1521 [ty] Generic types aliases (implicit and PEP 613) (#21553)
• 594b7b0 [ty] Preserve quoting style when autofixing TypedDict keys (#21682)
• b5b4917 [ty] Fix override of final method summary (#21681)
• 0084e94 [ty] Fix subtyping of type[Any] / type[T] and protocols (#21678)
• 566c959 [ty] Rename ReferenceRequestHandler file (#21680)
• 8bcfc19 [ty] Implement typing.final for methods (#21646)
• c534bfa [ty] Implement patterns and typevars in the LSP (#21671)
• 5e1b2ee [ty] implement rendering of .. code:: lang in docstrings (#21665)
• 98681b9 [ty] Add db parameter to Parameters::new method (#21674)
• Additional commits viewable in compare view

Sourced from mypy's changelog.

Mypy Release Notes

Next Release

Drop Support for Python 3.9

Mypy no longer supports running with Python 3.9, which has reached end-of-life. When running mypy with Python 3.10+, it is still possible to type check code that needs to support Python 3.9 with the --python-version 3.9 argument. Support for this will be dropped in the first half of 2026!

Contributed by Marc Mueller (PR 20156).

Mypy 1.19

We’ve just uploaded mypy 1.19.0 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.

Python 3.9 Support Ending Soon

This is the last mypy feature release that supports Python 3.9, which reached end of life in October 2025.

Performance Improvements

• Switch to a more dynamic SCC processing logic (Ivan Levkivskyi, PR 20053)
• Speed up type aliases (Ivan Levkivskyi, PR 19810)

Fixed‑Format Cache Improvements

Mypy uses a cache by default to speed up incremental runs by reusing partial results from earlier runs. Mypy 1.18 added a new binary fixed-format cache representation as an experimental feature. The feature is no longer experimental, and we are planning to enable it by default in a future mypy release (possibly 1.20), since it's faster and uses less space than the original, JSON-based cache format. Use --fixed-format-cache to enable the fixed-format cache.

Mypy now has an extra dependency on the librt PyPI package, as it's needed for cache serialization and deserialization.

Mypy ships with a tool to convert fixed-format cache files to the old JSON format. Example of how to use this:

$ python -m mypy.exportjson .mypy_cache/.../my_module.data.ff

... (truncated)

• 0f068c9 Remove +dev
• 6d5cf52 Various updates to 1.19 changelog (#20304)
• 3c81308 Add draft version of 1.19 release notes (#20296)
• 1999a20 [mypyc] librt base64: use existing SIMD CPU dispatch by customizing build fla...
• 1b94fbb [mypyc] Fix vtable pointer with inherited dunder new (#20302)
• 13369cb [mypyc] Fix crash on super in generator (#20291)
• a087a58 Update import map when new modules added (#20271)
• 35e843c [mypyc] Add efficient librt.base64.b64decode (#20263)
• 094f66d [mypyc] Add repr to AssignmentTarget subclasses (#20258)
• 0738db3 Do not push partial types to the binder (#20202)
• Additional commits viewable in compare view

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