Version Not Found

go.etcd.io/etcd v0.5.0-alpha.0.0.20141025002549-2b9cabcbcd4c

The requested version v0.5.0-alpha.0.0.20141025002549-2b9cabcbcd4c cannot be found for package go.etcd.io/etcd. Go to the default version (v0.4.9) instead.