Python 3.13.1 Released December 2025 Fixed Jun 2026

The team acknowledges a few low-priority issues that will be addressed in 3.13.2 (targeted March 2026):

: Tracebacks are now highlighted in color by default, providing clearer guidance and context-aware suggestions for common typos or import errors. The State of the 3.13 Branch PEP 719 – Python 3.13 Release Schedule python 3.13.1 released december 2025

Python 3.13.1 is the definitive release for the 3.13 lifecycle. While 3.13.0 was a proof-of-concept for the future of Python, 3.13.1 is the workhorse. If you are running microservices or data pipelines, the JIT improvements offer a "free" performance boost with minimal risk. The team acknowledges a few low-priority issues that

Following community feedback, 3.13.1 reverts two changes from 3.13.0 that caused slowdowns: If you are running microservices or data pipelines,

The majority of this release addresses edge cases discovered in the first two months of the 3.13 series. Notable fixes include:

: Perhaps the most significant experimental shift, this mode allows threads to run concurrently by disabling the Global Interpreter Lock, a major win for CPU-bound tasks in 2025.

The headline feature of the 3.13 series is the experimental support for free-threading (PEP 703), which removes the Global Interpreter Lock (GIL).