The initial feature-heavy release. Python 3.13.1 (December 3, 2024): The first bugfix release.
Python 3.13 introduced experimental free-threading ( --disable-gil ). Version 3.13.1 resolves over 30 race conditions discovered in the initial release. The threading module now handles reference counts more predictably under high concurrency. While still experimental, early adopters report 20% fewer crashes in multi-threaded web workloads. python release 3.13.1 december 2025
A long-standing issue where reference cycles with __del__ methods could cause memory leaks in long-running asyncio applications has been resolved. This is a silent win for server applications that run for months. The initial feature-heavy release
pyenv install 3.13.1 pyenv global 3.13.1 python release 3.13.1 december 2025