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Python support

Python versions

uv has Tier 1 support for the following Python versions:

  • 3.10
  • 3.11
  • 3.12
  • 3.13
  • 3.14

As with platforms, Tier 1 support can be thought of "guaranteed to work". uv is continuously tested against these versions.

uv has Tier 2 support for:

  • 3.6
  • 3.7
  • 3.8
  • 3.9

uv is "expected to work" with these versions. uv is tested against these versions, but they have reached their end-of-life and no longer receive security fixes. We do not recommend using these versions.

uv also has Tier 2 support for pre-releases of Python 3.15.

uv does not work with Python versions prior to 3.6.

Python implementations

uv has Tier 1 support for the following Python implementations:

  • CPython

As with platforms, Tier 1 support can be thought of "guaranteed to work". uv supports managed installations of these implementations, and the builds are maintained by Astral.

uv has Tier 2 support for:

  • PyPy
  • GraalPy
  • Pyodide

uv is "expected to work" with these implementations. uv also supports managed installations of these Python implementations, but the builds are not maintained by Astral.

uv has Tier 3 support for:

  • Pyston

uv "should work" with these implementations, but stability may vary.