Python 3.13.1 Released November 2025 May 2026

The announcement landed on the PSF blog at 09:00 UTC on November 18, 2025. The headline was deceptively simple:

On December 15, she spent fourteen hours wrapping every shared list in interpreter.channel objects—the new lock-free queues that passed data between subinterpreters like Olympic batons. python 3.13.1 released november 2025

“This is it,” her colleague Marcus whispered over their shared Slack channel, his avatar blinking with a gif of a rocket launch. “No more experimental guardrails. No more ‘may cause undefined behavior.’ This is the production hammer.” The announcement landed on the PSF blog at

Until November 2025.

She wrote in her notebook: "It’s real. Python just grew a second lung." python 3.13.1 released november 2025

- Promoted from "provisional" to "stable" in the official Windows and macOS installers. Linux remains optional.