chore: drop Python 3.9 support ahead of October 2025 EOL #1426
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Python 3.9 reaches end-of-life on October 5, 2025. Remove support across: - CI/CD workflows (GitHub Actions, GitLab CI) - Testing configurations (tox.ini) - Development containers - Documentation and requirements
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Pull Request Overview
This PR drops Python 3.9 support ahead of its October 2025 End-of-Life date and updates the minimum Python requirement to 3.10. The changes ensure all project configurations, CI workflows, and documentation reflect the new Python version requirements of 3.10-3.13.
- Updated Python version ranges from 3.9-3.12/3.13 to 3.10-3.13 across all configurations
- Removed Python 3.9 from CI/CD test matrices and build configurations
- Updated documentation to reflect the new minimum Python requirement
Reviewed Changes
Copilot reviewed 14 out of 15 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| tox.ini | Updated test environment list and pyenv install commands to exclude Python 3.9 |
| pyproject.toml | Removed Python 3.9 classifier and updated dependency version constraints |
| docs/getting-started/installation-guide.md | Updated software requirements to specify Python 3.10+ |
| README.md | Updated Python version requirements in main documentation |
| CONTRIBUTING.md | Updated development setup requirements to Python 3.10+ |
| .pre-commit-config.yaml | Updated commented pylint language version reference |
| .gitlab-ci.yml | Removed Python 3.9 test job |
| .github/workflows/*.yml | Removed Python 3.9 from test matrices across all GitHub Actions workflows |
| .devcontainer/devcontainer.json | Updated Python version comment to reflect new supported versions |
| .devcontainer/Dockerfile | Updated Python version options comment |
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Looks good! I did a quick grep and there aren't any references to 3.9 remaining.
Not needed for this PR, but FYI did a check with pyupgrade to remove deprecated syntax from Python 3.9 in the codebase:
$ find . -name '*.py' -exec pyupgrade --py310-plus {} +
There were 177 modified files. I spot-checked a few files and the updates were all to type syntax, for example using list instead of List, dict instead of Dict, and typeA | typeB rather than Optional[TypeA, TypeB]. I can address these in the ongoing type-cleaning PRs after the release.
Summary
https://peps.python.org/pep-0596/
Files Changed