Version Not Found

go.etcd.io/etcd v0.5.0-alpha.4.0.20141126073201-d01d6119e54f

The requested version v0.5.0-alpha.4.0.20141126073201-d01d6119e54f cannot be found for package go.etcd.io/etcd. Go to the default version (v0.4.9) instead.