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Drop support for Python 3.9 - #375
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sapols merged 1 commit intoNov 6, 2026
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November 5, 2026 01:58
GitHub is moving ubuntu-latest to Ubuntu 26.04, which has no Python 3.9 build in setup-python, so the ubuntu-latest 3.9 test job fails at setup and fail-fast cancels the rest of the matrix. Python 3.9 has been end of life since October 2025, so stop testing it and declare requires-python >= 3.10.
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Change Summary
Overview
Closes #374.
ubuntu-latestis moving to Ubuntu 26.04, and actions/setup-python has no Python 3.9 build for it, so the Ubuntu 3.9 test job fails at setup and fail-fast cancels the rest of the matrix. Rather than keep testing 3.9 onubuntu-24.04, we agreed on Slack to drop Python 3.9, which has been end of life since October 2025. Python 3.9 users will keep getting the last release before this one.File changes
.github/workflows/test.yml: remove 3.9 from the test matrix.pyproject.toml: addrequires-python = ">=3.10"and remove the 3.9 classifier.FYI, I left ruff's
target-versionatpy39; moving it topy310would rewrite 31Optional/Unionannotations, which could/should be its own change if desired.Testing
CI on this PR runs the 12 remaining jobs. Locally, the tests pass on Python 3.10, and pip on Python 3.9 refuses to install this version.