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@dependabot dependabot bot commented on behalf of github Dec 1, 2025

Bumps mypy from 1.18.2 to 1.19.0.

Changelog

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)

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@dependabot dependabot bot added dependencies Pull requests that update a dependency file python Pull requests that update python code labels Dec 1, 2025
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github-actions bot commented Dec 1, 2025

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines Covered Coverage Threshold Status
1458 1458 100% 99% 🟢

New Files

No new covered files...

Modified Files

No covered modified files...

updated for commit: 73f3a68 by action🐍

Bumps [mypy](https://github.com/python/mypy) from 1.18.2 to 1.19.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.18.2...v1.19.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.19.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot bot force-pushed the dependabot/pip/mypy-1.19.0 branch from 1769bc3 to 73f3a68 Compare December 2, 2025 03:55
@MaddyGuthridge MaddyGuthridge merged commit 3e3a6a2 into main Dec 2, 2025
12 checks passed
@dependabot dependabot bot deleted the dependabot/pip/mypy-1.19.0 branch December 2, 2025 03:58
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