Remove Python 3.9 support #488
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Python 3.9 reached upstream EOL on 31st October 2025: https://devguide.python.org/versions/#supported-versions The Python version support policy is that supported versions follows the upstream EOL lifecycle: https://devcenter.heroku.com/articles/python-support#python-version-support-policy And Python 3.9 support has been deprecated since 8th January 2025: https://devcenter.heroku.com/changelog-items/3095 As such, builds of apps using Python 3.9 will now fail with an error message explaining they must be upgraded to a newer/supported Python version. Apps using Python 3.9 that aren't able to upgrade immediately will need to pin to an older buildpack version temporarily. GUS-W-17595555.
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## heroku/python ### Removed - Removed support for Python 3.9. ([#488](heroku/buildpacks-python#488)) ### Changed - Updated pip from 25.2 to 25.3. ([#453](heroku/buildpacks-python#453))
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Python 3.9 reached upstream EOL on 31st October 2025:
https://devguide.python.org/versions/#supported-versions
The Python version support policy is that supported versions follows the upstream EOL lifecycle:
https://devcenter.heroku.com/articles/python-support#python-version-support-policy
And Python 3.9 support has been deprecated since 8th January 2025:
https://devcenter.heroku.com/changelog-items/3095
As such, builds of apps using Python 3.9 will now fail with an error message explaining they must be upgraded to a newer/supported Python version.
Apps using Python 3.9 that aren't able to upgrade immediately will need to pin to an older buildpack version temporarily.
GUS-W-17595555.