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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:
Go second-generation runtimes (after end of support): To upgrade to a
supported version of Go,
update the app.yaml file by specifying a version of Go that you
want your app to run. For example:
runtime:goVERSION
Where VERSION is the Go MAJOR and MINOR version numbers.
For example, to use the latest Go version, Go 1.25,
specify 125.
For more information, see the
Go runtime overview.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-29 UTC."],[[["\u003cp\u003eApplications must be upgraded to the latest supported runtime version to receive security updates and technical support.\u003c/p\u003e\n"],["\u003cp\u003eUpgrading an app depends on whether it uses the Go 1.11 (first-generation) or a second-generation runtime.\u003c/p\u003e\n"],["\u003cp\u003eGo 1.11 reached end of support on January 30, 2024, and while existing apps will continue to run, redeployment might be blocked.\u003c/p\u003e\n"],["\u003cp\u003eApps using second-generation runtimes can be upgraded by updating the \u003ccode\u003eapp.yaml\u003c/code\u003e file to specify a supported Go version.\u003c/p\u003e\n"]]],[],null,["# Upgrade an existing application\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n\nYou must upgrade your applications to the [latest supported runtime version](/appengine/docs/standard/lifecycle/support-schedule#go) to continue receiving security updates and be eligible for\ntechnical support.\n\nThe process of upgrading an existing app depends on the runtime version that\nyour app currently uses:\n\n- **Go 1.11 (first-generation runtime)** : You must migrate your app to the [latest supported Go version](/appengine/docs/standard/lifecycle/support-schedule#go). Go 1.11 has reached [end of support](/appengine/docs/standard/lifecycle/runtime-lifecycle#end_of_support) on January 30, 2024. Your\n existing Go 1.11 applications will continue to run and receive traffic. However,\n App Engine might block re-deployment of applications that use runtimes\n [after their end of support date](/appengine/docs/standard/lifecycle/support-schedule#go).\n To migrate to the latest supported version of Go, see\n [Migrate from Go 1.11 to the latest Go runtime](/appengine/migration-center/standard/migrate-to-second-gen/go-differences).\n\n- **Go second-generation runtimes (after end of support)** : To upgrade to a\n [supported version of Go](/appengine/docs/standard/lifecycle/support-schedule#go),\n update the `app.yaml` file by specifying a version of Go that you\n want your app to run. For example:\n\n runtime: go\u003cvar translate=\"no\"\u003eVERSION\u003c/var\u003e\n\n Where \u003cvar translate=\"no\"\u003eVERSION\u003c/var\u003e is the Go `MAJOR` and `MINOR` version numbers.\n For example, to use the latest Go version, Go 1.25,\n specify `125`.\n For more information, see the\n [Go runtime overview](/appengine/docs/standard/go/runtime)."]]
