Questions? Spotted a bug in 3.13.1 already? Drop a comment or ping me on Mastodon. And yes — I'll update this post if any critical CVEs emerge in the next 72 hours.
Let me cut through the noise and tell you what actually matters. Python 3.13.1 is a bugfix release — the first in the 3.13 series. If you're running 3.13.0 (released October 7, 2024), you'll want this update. If you're still on 3.12 or earlier, this isn't your cue to upgrade just yet, but it's worth knowing what's coming. python 3.13.1 released today
3.13.1 fixes a subtle reference-counting race condition in weakref.finalize and a deadlock involving threading.Condition in free-threaded mode. These were hard to reproduce but real — several scientific computing early adopters reported them. Questions