Mypy Release Notes

Next Release

Remove Support for targeting Python 3.8

Mypy now requires --python-version 3.9 or greater. Support for only Python 3.8 is fully removed now. Given an unsupported version, mypy will default to the oldest supported one, currently 3.9.

This change is necessary because typeshed stopped supporting Python 3.8 after it reached its End of Life in October 2024.

Contributed by Marc Mueller (PR 19157, PR 19162).

Initial Support for Python 3.14

Mypy is now tested on 3.14 and mypyc works with 3.14.0b3 and later. Mypyc compiled wheels of mypy itself will be available for new versions after 3.14.0rc1 is released.

Note that not all new features might be supported just yet.

Contributed by Marc Mueller (PR 19164)

Deprecated Flag: --force-uppercase-builtins

Mypy only supports Python 3.9+. The --force-uppercase-builtins flag is now deprecated and a no-op. It will be removed in a future version.

Contributed by Marc Mueller (PR 19176)

Mypy 1.16

We’ve just uploaded mypy 1.16 to the Python Package Index (PyPI). Mypy is a static type checker for Python. This release includes new features 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.

Different Property Getter and Setter Types

Mypy now supports using different types for a property getter and setter:

class A:
    _value: int
@property

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