diff --git a/app/services/vcs.py b/app/services/vcs.py
index 00ef3c2..0e97ec8 100644
--- a/app/services/vcs.py
+++ b/app/services/vcs.py
@@ -27,4 +27,5 @@ class GitService:
     return Repo(config.path)
 
   def checkout(self, sha: str):
-    pass
+    self._origin.fetch()
+    self._repo.git.checkout(sha)