Having two different versions is not an issue, tools like GVM helps in managing them. Docker helps in handling this easily without any extra tools. But, if something is built with a version, it cannot be easily changed without thorough testing.

For e.g. when Kubernetes was built with Go 1.8 instead of 1.7, emptyDir teardown path was broken due to the change in behavior of os.Rename in Go 1.8 [1]. This bug caused other issues like the one with minikube [2] and they had to rebuild with Go 1.7 and update new binaries for already released v0.20.0

[1] https://github.com/kubernetes/kubernetes/issues/43534#issuec... [2] https://github.com/kubernetes/minikube/issues/1630#issuecomm...