Go - go get -u
zzh@ZZHPC:/zdata/MyPrograms/Go/zapp10$ go get -u go: downloading github.com/XXX/zzhrepo1 v1.1.0 go: upgraded github.com/XXX/zzhrepo1 v1.0.1 => v1.1.0
"go get -u" updates all packages in the module to the latest version.
"go get -u <package_name>" updates a specific package to the latest version.
"go get <module_name>@<version_number>" downloads a specific version of the module.