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I'd be ok to merge this to get wheels and stuff working again. We can directly open a PR that undoes the pin again so we don't forget.

I'm surprised we don't also have to introduce the <9 limit in _min_dependencies.py

OK let's merge this one to get the wheels green again!

We'll see when pytest does a 9.0.1 with the revert.

I'm surprised we don't also have to introduce the <9 limit in _min_dependencies.py

We may need to add pytest<9 in build_tools/update_environment_and_lock_files.py if we want to be able to update lock-files again. There is less pressure to do this, since thanks to the beauty of lock-files, most of our CI is not affected by the pytest 9.0 change.

The lockfiles is what I meant. Can you tell I don't keep the information where exactly I need to go to influence them loaded in RAM? :D

The wheels build worked fine this morning 🎉 https://github.com/scikit-learn/scikit-learn/actions/runs/19285781661

FWIW I wouldn't do anything about the lock-files yet.

It seems like pytest is preparing a 9.0.1 release pytest-dev/pytest#13938 which should happen soonish and has the revert of the raise unittest.SkipTest breaking change.