App Engine flexible environment Python to enforce TLS 1.2+
Google Cloud's App Engine flexible environment for Python applications will mandate TLS version 1.2 or later starting in August 2026 to enhance security. Users can opt out of this enforcement until the end of August 2026. However, from September 2026, the platform may permanently block traffic using TLS 1.1 and earlier, requiring applications to upgrade their TLS support. This change affects all Python applications running on the flexible environment.
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- App Engine flexible environment Python
To improve security, starting in August 2026, App Engine opts your application into TLS version 1.2 and later. You can opt out until the end of August 2026. Starting in September 2026, App Engine might permanently block insecure traffic with TLS version 1.1 and earlier. For more information, see Secure minimum TLS .
https://docs.cloud.google.com/release-notes#August_14_2026
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