# Using pyenv pyenv install 3.13.1
Another experimental feature is the ability to build Python without the Global Interpreter Lock (GIL). This is the beginning of the "free-threading" future where Python can utilize multiple CPU cores more effectively for CPU-bound tasks. As with the JIT, 3.13.1 provides critical patches for early adopters testing these builds. python 3.13.1 release notes today
A critical update includes upgrading libexpat to version 2.6.4 to address CVE-2024-50602 . # Using pyenv pyenv install 3
As of April 20, 2026, is no longer the most current maintenance release of the 3.13 series . It has been superseded by Python 3.13.13 , which was released on April 7, 2026. which was released on April 7
Here are the key areas impacted: