diff --git a/synapse/groups/attestations.py b/synapse/groups/attestations.py
index 1eec3874b600..bd7dbe0d36f6 100644
--- a/synapse/groups/attestations.py
+++ b/synapse/groups/attestations.py
@@ -208,6 +208,5 @@ def _renew_attestation(group_user: Tuple[str, str]):
                     "Error renewing attestation of %r in %r", user_id, group_id
                 )
 
-        await yieldable_gather_results(
-            _renew_attestation, ((row["group_id"], row["user_id"]) for row in rows)
-        )
+        for row in rows:
+            await _renew_attestation((row["group_id"], row["user_id"]))