Go function build fails due to Go version

Problem

My Go Serverless Function build failed with an error message mentioning a wrong version.

Cause

Go function deployment may fail during the build step with a version mismatch error, even if the runtime version appears to be correct.

This is due to the go.mod directive that specifies an X.Y.Z version where the Z patch version does not match the version of the selected runtime.

This happens by default because the go mod init command includes the full Go version (including the patch version), which can lead to this mismatch if your runtime only supports a different patch version.

Possible solution

Remove the Z patch version from the go.mod file. In the example below, X corresponds to 1, Y to 24, and Z to 1.

Content of a go.mod file with an incorrect X.Y.Z (1.24.1) version.

go 1.24.1

The example below shows the content of the go.mod file after we removed the incorrect Z version:

go 1.24