Python 3.10 reaches end of life, 3.10.22 is the final release

Python 3.10 officially stopped receiving updates, including security patches, on October 1, 2026, with 3.10.22 as its last release. The branch had been in security-only mode since 2023 and now gets no fixes at all. The author describes migrating an offline stdlib-only tool to Python 3.15.1.

• Python 3.10.22 is the final release of the branch, shipped October 1, 2026
• Since 2023 the branch received only security patches; now it gets nothing
• Python 3.15.1 and 3.14.9 shipped the day before, with 3.15 as the upgrade path
• Python 3.15 makes UTF-8 the default encoding (PEP 686) and adds lazy imports (PEP 810)