The first release of the Go buildpack after October 2, 2020 will no longer include Go versions 1.13.x. These Go versions will no longer be supported upstream. Please migrate your Go apps to supported versions of Go before that time.
Note: As 1.13.x is the current default version of Go in the buildpack, the default Go version will be updated to 1.15.x as a part of this removal. If you’d like to use a different Go version, please configure your application to select that version.
As always, the buildpacks team is happy to answer questions you may have about this deprecation in the #buildpacks Slack channel.
Kashyap Vedurmudi, Buildpacks PM