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The App Engine flexible environment runtimes use open source components that are maintained by their respective communities. The runtimes are identified by their language version, for example, Java 17, Python 3.10, and so forth.
Google provides support for a runtime during General availability (GA). During this support window:
When a language version is no longer actively maintained by the respective community, App Engine will also stop providing maintenance and support for that language runtime. Before a runtime reaches the end of support phase as described in the runtimes support schedule, Google will provide a notification to customers.
Google may make changes to any runtime's support schedule or lifecycle in accordance with the terms of your agreement for the use of Google Cloud platform services.
Custom runtimesCustom runtimes allow you to define new runtime environments which may include additional components like language interpreters or application servers.
Custom runtimes are not impacted by the runtime lifecycle policy.
Runtime lifecycle GA-level support End of Support Deprecated Decommissioned Creation & redeployment Yes No No No Project Configuration Updates Yes Yes No No Running existing workloads Yes Yes Yes No UI & CLI Warnings Yes Yes No No Language patches Automatic No automatic updates No automatic updates No automatic updates Patching APIs & SDKs Automatic No automatic updates No automatic updates No automatic updates Customer Support GA-level support No runtime support No runtime support No runtime support Notification periodApp Engine will begin issuing in-app notifications 90 days before the application reaches end of support. Upon notification, you should prepare to upgrade your application to a newer runtime that is supported in the flexible environment .
End of support Important: Google will no longer apply security updates or patches to components of the runtime environment that have reached end of support. To continue receiving security updates, we strongly encourage you to upgrade your application to a supported runtime version as soon as it becomes available.When runtime components reach the end of support date:
We strongly encourage you to upgrade your application to a supported runtime version as soon as it becomes available to continue receiving security updates and being eligible for technical support.
Alternatively, you can redeploy your application using a
custom runtime.
DeprecatedIf Google allowed your Organization to re-enable deployments in an unsupported runtime, Google will remove that ability once the runtime is deprecated.
Where practicable, we will make reasonable efforts to notify you in advance of the deprecation by in-app notifications or other means. In certain instances, including in circumstances involving critical security vulnerabilities or similar high severity issues, advance notice may not be practicable.
DecommissionedApplications that continue to use a decommissioned runtime may be disabled without further notice. You must choose a more up-to-date runtime to deploy your application.
See the runtimes support schedule for key dates.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-07 UTC.
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