1 files changed, 5 insertions, 2 deletions
diff --git a/synapse/storage/databases/main/relations.py b/synapse/storage/databases/main/relations.py
index 0018d6f7ab..fa3266c081 100644
--- a/synapse/storage/databases/main/relations.py
+++ b/synapse/storage/databases/main/relations.py
@@ -22,6 +22,7 @@ from typing import (
     List,
     Mapping,
     Optional,
+    Sequence,
     Set,
     Tuple,
     Union,
@@ -171,7 +172,7 @@ class RelationsWorkerStore(SQLBaseStore):
         direction: Direction = Direction.BACKWARDS,
         from_token: Optional[StreamToken] = None,
         to_token: Optional[StreamToken] = None,
-    ) -> Tuple[List[_RelatedEvent], Optional[StreamToken]]:
+    ) -> Tuple[Sequence[_RelatedEvent], Optional[StreamToken]]:
         """Get a list of relations for an event, ordered by topological ordering.
 
         Args:
@@ -397,7 +398,9 @@ class RelationsWorkerStore(SQLBaseStore):
         return result is not None
 
     @cached()
-    async def get_aggregation_groups_for_event(self, event_id: str) -> List[JsonDict]:
+    async def get_aggregation_groups_for_event(
+        self, event_id: str
+    ) -> Sequence[JsonDict]:
         raise NotImplementedError()
 
     @cachedList(