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The 3.13.0 release was ambitious, but the patches in 3.13.1 address the immediate regressions found in October. If you are already running 3.13.0, upgrade immediately to benefit from security patches and crash fixes. python 3.13.1 released nov 2025
The Just-In-Time (JIT) compiler introduced in 3.13.0 was experimental. The 3.13.1 update brings micro-optimizations that improve startup times and reduce the memory overhead of the JIT trace cache. Users running web servers (like FastAPI or Django) on 3.13 should see more consistent performance metrics in this patch release. You can use this text for a blog