diff --git a/obs/update_unstable.py b/obs/update_unstable.py
index 1fda970..a1f600e 100755
--- a/obs/update_unstable.py
+++ b/obs/update_unstable.py
@@ -75,20 +75,12 @@ def project_exists(project: str) -> bool:
     return False
 
 
-def lsremote(url: str) -> Dict[str, str]:
-
-    remote_refs = {}
-    gitcmd = git.cmd.Git()
-    for ref in gitcmd.ls_remote(url).split('\n'):
-        hash_ref_list = ref.split('\t')
-        remote_refs[hash_ref_list[1]] = hash_ref_list[0]
-
-    return remote_refs
-
-
 def get_remote_hash(url: str, branch: str = "master") -> str:
-    refs = "refs/heads/{}".format(branch)
-    return lsremote(url)[refs]
+
+    gitcmd = git.cmd.Git()
+    revision = gitcmd.ls_remote(url, branch, quiet=True, refs=True)
+    git_hash, branch = revision.split("\t")
+    return git_hash
 
 
 def trigger_update(repository: str, package_name: str,