If you depend on the GIL being gone, or the JIT being correct, upgrade today. If you’re on 3.12 and happy, wait for 3.13.2 (expected February 2026). But know that by shipping 3.13.1, the Python project has signaled that 3.13 is no longer “new and shiny” — it’s “ready for real work.”
python3.13 --version # Python 3.13.1 python.org/downloads/release/python-3131 (available since Nov 19, 2025) python 3.13.1 release november 2025 news
import sys if not sys.is_gil_enabled(): print("Running in free-threaded mode (PEP 703)") Small, but signals that no-GIL is moving toward official API status. Python 3.13.1 is exactly what a .1 release should be: boring, safe, and necessary . The core team used the month after 3.13.0 to grind through regression reports, fuzzer crashes, and build farm failures. If you depend on the GIL being gone,
Here’s a deep-dive post on the topic, written as if from a tech journalist or Python core developer enthusiast. On November 19, 2025, the Python Steering Council and core development team quietly released Python 3.13.1 , the first bugfix release of the 3.13 series. No fireworks, no PEP 8000-level drama — but for anyone running Python in production, teaching it, or building tools, this is the version you’ve been waiting for. Python 3