@ManonMarchand pyerfa 2.0.1.4 should already be compatible with Python 3.13 because it's compiled with Python's Limited C API

I thought our CI failed due to pyerfa when I added python 3.13, but reading it again... maybe I'm wrong. Can you give us pointers on why it failed? See the run here: https://github.com/cds-astro/mocpy/actions/runs/11345966890/job/31553997210#step:5:5511

It seeems this job is using the free-threaded version of Python 3.13 (shorthand: 3.13t), which is indeed incompatible with Python's Limited C API: this bit is solved in pyerfa (dev) and will indeed require a release there, however you shouldn't have this issue with the default (GIL-enabled) build for Python 3.13.
The part I don't understand at the moment is why you're getting 3.13t instead of a regular 3.13 in CI

Oh I see, you're getting Python builds straight from a docker container (quay.io/pypa/manylinux2014_x86_64), and it looks like the only Python 3.13 that is in store is free-threaded.
Even if we release pyerfa with the fix for building in this env, it's a bit of a gamble to test 3.13t before 3.13, as your dependencies might not be compatible with this new and experimental build, so I would suggest finding ways to access a regular 3.13 build in CI if you can.

That's clearer, thanks. We'll investigate building wheels with an other base image. Do you need support for python3.13 soon?

However, we'll still need to support both 3.13 and 3.13t, since the manylinux2014 build was requested by our users.

Do you need support for python3.13 soon?

No, I'm just looking for packages in the broad astropy ecosystem that might need a hand with ensuring compatibility, and this looked like the blocking issue for astroquery, but I do not need it personally.

we'll still need to support both 3.13 and 3.13t

Then I'd advise to be extra careful when communicating the level of support for 3.13t: even if your test suite pass on a single thread, it won't mean that you have free-threading compatibility out of the box, though it's still worth mentionning.

See this excellent resource if needed https://py-free-threading.github.io/