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Release Checklist

See https://pillow.readthedocs.io/en/stable/releasenotes/versioning.html for information about how the version numbers line up with releases.

Main Release

Released quarterly on January 2nd, April 1st, July 1st and October 15th.

  • Open a release ticket e.g. https://github.com/python-pillow/Pillow/issues/3154
  • Develop and prepare release in main branch.
  • Check GitHub Actions and AppVeyor to confirm passing tests in main branch.
  • Check that all of the wheel builds Pillow Wheel Builder pass the tests in Travis CI and GitHub Actions.
  • In compliance with PEP 440, update version identifier in src/PIL/_version.py
  • Update CHANGES.rst.
  • Run pre-release check via make release-test in a freshly cloned repo.
  • Create branch and tag for release e.g.:
    git branch 5.2.x
    git tag 5.2.0
    git push --all
    git push --tags
  • Create and check source distribution:
    make sdist
    twine check dist/*
  • Create binary distributions
  • Check and upload all binaries and source distributions e.g.:
    twine check dist/*
    twine upload dist/Pillow-5.2.0*
  • Publish the release on GitHub
  • In compliance with PEP 440, increment and append .dev0 to version identifier in src/PIL/_version.py

Point Release

Released as needed for security, installation or critical bug fixes.

  • Make necessary changes in main branch.

  • Update CHANGES.rst.

  • Check out release branch e.g.:

    git checkout -t remotes/origin/5.2.x
  • Cherry pick individual commits from main branch to release branch e.g. 5.2.x, then git push.

  • Check GitHub Actions and AppVeyor to confirm passing tests in release branch e.g. 5.2.x.

  • In compliance with PEP 440, update version identifier in src/PIL/_version.py

  • Run pre-release check via make release-test.

  • Create tag for release e.g.:

    git tag 5.2.1
    git push
    git push --tags
  • Create and check source distribution:

    make sdist
    twine check dist/*
  • Create binary distributions

  • Check and upload all binaries and source distributions e.g.:

    twine check dist/*
    twine upload dist/Pillow-5.2.1*
  • Publish the release on GitHub

Embargoed Release

Released as needed privately to individual vendors for critical security-related bug fixes.

  • Prepare patch for all versions that will get a fix. Test against local installations.
  • Commit against main, cherry pick to affected release branches.
  • Run local test matrix on each release & Python version.
  • Privately send to distros.
  • Run pre-release check via make release-test
  • Amend any commits with the CVE #
  • On release date, tag and push to GitHub.
    git checkout 2.5.x
    git tag 2.5.3
    git push origin 2.5.x
    git push origin --tags
  • Create and check source distribution:
    make sdist
    twine check dist/*
  • Create binary distributions
  • Publish the release on GitHub

Binary Distributions

Windows

Mac and Linux

Publicize Release

Documentation

Docker Images

  • Update Pillow in the Docker Images repository
    git clone https://github.com/python-pillow/docker-images
    cd docker-images
    ./update-pillow-tag.sh [[release tag]]