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.

December 6, 2024 — Just when you thought the Python world would wind down for the holidays, the core development team has dropped Python 3.13.1 , a maintenance release that's anything but routine. python 3.13.1 released today

The team is effectively saying: "We'll push major features, but we'll clean up fast." The team is effectively saying: "We'll push major

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. And yes — I'll update this post if

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.

The free-threaded future is coming. The JIT is coming. But today, we got a quieter gift: a Python that crashes less, pastes correctly, and respects your terminal.