Python 3.15 Released, uv 0.13.0 Adds Same-Day Support

Python 3.15.0 has been officially released with 5,643 commits from 1,012 contributors, featuring UTF-8 as the default encoding, lazy imports, and a 12% JIT speedup. uv 0.13.0 shipped the same day, switching its default stable Python to 3.15 with several breaking changes.

2026-10-10 ~ 2026-10-10 · 3 related posts

• Python 3.15 ships, available same-day in uv 0.13.0 — charliermarsh · 2026-10-10
• uv 0.13.0 makes Python 3.15 the default, ships cache format changes and uv_build breaking change — charliermarsh · 2026-10-10
• Python 3.15 ships: default UTF-8, lazy imports, JIT 12% faster, Tachyon profiler — charliermarsh · 2026-10-10