It looks like Pillow will have a release on or about July 1 which will have 3.13 wheels, so I'll wait till about then before looking at this again.

This is somewhat related to this PR, when 3.13 hits the release, which versions of matplotlib will be supported under 3.13? How far will you go back and create wheels? (do you have a plan)

Thanks for this package!

It will be in whatever the next release is when 3.13 is ABI stable.

Pillow now has free-threading wheels on the nightly channel, so I've enabled testing as well (except for Windows, since NumPy doesn't have those wheels yet.) Of course, the testing is just an import check, and our extensions don't claim free-threading support, so it's not much of a test.

Looks like we'll need to skip cp313t-manylinux_aarch64 as there are no Pillow wheels there yet.

I'm going to go ahead and merge this.

Python 3.13rc1 is out now, which is ABI stable with future 3.13 releases. the latest cibuildwheel (2.20) uses it and builds 3.13 wheels by default.

What would be the fastest way to get 3.13 wheels on PyPI? Would a backport to the 3.9 branch be possible?

Edit: A PR to update cibuildwheel was already opened:

• Bump the actions group with 2 updates #28668

We will backport that cibuildwheel update to 3.9.x branch and the next release will have the additional wheels. In general we do not go back and rebuild wheels for already released versions.

Awesome that it can be backported, looking forward to matplotlib 3.9.2 with Python 3.13 wheels!