Python 3.13.3 is the third maintenance release of the Python 3.13 series. Following the initial feature freeze of Python 3.13.0 in October 2024, this release focuses exclusively on stability, performance optimizations for the experimental JIT compiler, and critical security patches.
# Using pyenv pyenv install 3.13.3
Because 3.13.3 is a "point release" (patch release), there is no standalone academic-style "white paper" for it. Instead, it is documented via a and a Changelog . python 3.13.3 released april 2025
Complementing this is the introduction of a (PEP 744). Though still in its preliminary stages as of the 3.13.3 release, the JIT provides the foundational framework for massive performance gains in future versions. By compiling frequently used code into machine-native instructions on the fly, Python is evolving from a strictly interpreted language into a more performance-resilient ecosystem. Refined Developer Experience
April 8, 2025 Status: Maintenance/Stable Security Content: High Python 3
Test your existing projects with 3.13.3 using tox or nox — maintenance releases rarely break code, but the JIT compiler improvements in 3.13 (introduced in .0) continue to mature.
conda create -n py3133 python=3.13.3
: Addressing over 300 individual issues identified since version 3.13.2.