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You must upgrade your applications to the latest supported runtime version to continue receiving security updates and be eligible for technical support.
The process of upgrading an existing app depends on the runtime version that your app currently uses:
Python 2.7 (first-generation runtime): You must migrate your app to the latest supported Python version. Python 2.7 has reached end of support on January 31, 2024. Your existing Python 2.7 applications will continue to run and receive traffic. However, App Engine might block re-deployment of applications that use runtimes after their end of support date. To migrate from Python 2.7 to the latest supported version of Python, see Migrate to the Python 3 runtime.
Python second-generation runtimes (after end of support): To upgrade to a supported version of Python, update the
app.yamlfile by specifying a version of Python that you want your app to run. For example:runtime: pythonVERSIONWhere VERSION is the Python
MAJORandMINORversion numbers. For example, to use the latest Python version, Python 3.14, specify314. For more information, see the Python runtime overview.