AWS Lambda Ends Python 3.10 Support: Migrate to 3.12+ by October 2026

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AWS is deprecating the Python 3.10 runtime for Lambda, with October 31, 2026 set as the deprecation date. After that point, existing functions keep running but stop receiving critical security patches and lose console editing access. Creation and update of functions on the runtime will be blocked starting July 29, 2027 and August 31, 2027, respectively. The change follows Python 3.10's own end-of-life in October 2023, after which the language stopped issuing security updates. Moving to Python 3.12 or later involves more than a version change, since removed modules, a shift to Amazon Linux 2023, and rebuilt compiled dependencies all require attention.

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