The version numbers and dates in your request contradict the official release calendar. It is highly likely you are looking for information on one of the following two scenarios:

A long-standing wart was fixed: mutating the locals() dictionary now reliably updates local variables in optimized scopes. This makes debugging and dynamic code execution more predictable.

If you encounter any issues with Python 3.13.1, report them on the Python Issue Tracker .

Improved protection against supply-chain attacks within the interpreter's core C code.