diff --git a/requirements-swh.txt b/requirements-swh.txt
--- a/requirements-swh.txt
+++ b/requirements-swh.txt
@@ -2,4 +2,4 @@
 swh.loader.core >= 0.5.9
 swh.model >= 0.4.0
 swh.scheduler >= 0.0.39
-swh.storage >= 0.11.3
+swh.storage >= 0.12.0
diff --git a/swh/loader/git/loader.py b/swh/loader/git/loader.py
--- a/swh/loader/git/loader.py
+++ b/swh/loader/git/loader.py
@@ -309,7 +309,7 @@
     def get_contents(self) -> Iterable[BaseContent]:
         """Format the blobs from the git repository as swh contents"""
         missing_contents = set(
-            self.storage.content_missing(self.get_content_ids(), "sha1_git")
+            self.storage.content_missing(list(self.get_content_ids()), "sha1_git")
         )
 
         for raw_obj in self.get_inflater():