App Engine flexible environment Python to use Cloud SQL Auth Proxy v2
The App Engine flexible environment for Python applications will transition to using Cloud SQL Auth Proxy v2 as its built-in sidecar container for Cloud SQL connections. This change, effective August 2026, aims to provide modern security patches and support for MySQL 8.4 and later versions. Developers using this environment can restart their VMs or deploy a new application version to adopt the updated proxy immediately. This affects applications relying on Cloud SQL for their data persistence.
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- App Engine flexible environment Python
Starting from August 2026, to provide modern security patches and support for MySQL 8.4 and later, the App Engine flexible environment uses Cloud SQL Auth Proxy v2 as the built-in sidecar container for connections to Cloud SQL. To use the latest Cloud SQL Auth Proxy container immediately, restart your VMs or deploy a new version of your application.
https://docs.cloud.google.com/release-notes#August_20_2026
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