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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 1.22,
specify 122.
For more information, see the
Go runtime overview.