Release Checklist

Main Release

• Open a release ticket e.g. Release 2.9.0 on July 1, 2015 #1174
• Develop and prepare release in master branch.
• Check Travis CI and AppVeyor CI to confirm passing tests in master branch.
• Check that all of the wheel builds Pillow Wheel Builder pass the tests in TravisCI.
• In compliance with https://www.python.org/dev/peps/pep-0440/, 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 2.9.x
    $ git tag 2.9.0
    $ git push --all
    $ git push --tags

• Create source distributions e.g.:

    $ make sdist

• Create binary distributions
• Upload all binaries and source distributions with twine upload dist/Pillow-4.1.0-*
• [n/a] Manually hide old versions on PyPI such that only the latest major release is visible when viewing https://pypi.org/project/Pillow/ (https://pypi.org/manage/project/Pillow/releases/)

Binary Distributions

Windows

• Contact @cgohlke for Windows binaries via release ticket e.g. Release 2.9.0 on July 1, 2015 #1174.
• Download and extract tarball from @cgohlke and twine upload *.

Mac and Linux

• Use the Pillow Wheel Builder:

    $ git checkout https://github.com/python-pillow/pillow-wheels
    $ cd pillow-wheels
    $ git submodule init
    $ git submodule update
    $ cd Pillow
    $ git fetch --all
    $ git checkout [[release tag]]
    $ cd ..
    $ git commit -m "Pillow -> 2.9.0" Pillow
    $ git push

• Download distributions from the Pillow Wheel Builder container.

Publicize Release

• Announce release availability via Twitter e.g. https://twitter.com/aclark4life/status/583366798302691328.

Documentation

• Make sure the default version for Read the Docs is the latest release version, e.g. 3.1.x rather than latest: https://readthedocs.org/projects/pillow/versions/