diff --git a/matrix_utils.py b/matrix_utils.py
index 7e12208..8ff5cc6 100644
--- a/matrix_utils.py
+++ b/matrix_utils.py
@@ -62,13 +62,19 @@ async def join_matrix_room(matrix_client, room_id_or_alias: str) -> None:
     """Join a Matrix room by its ID or alias."""
     try:
         if room_id_or_alias.startswith("#"):
-            response = await matrix_client.resolve_room_alias(room_id_or_alias)
+            response = await matrix_client.room_resolve_alias(room_id_or_alias)
             if not response.room_id:
                 logger.error(
                     f"Failed to resolve room alias '{room_id_or_alias}': {response.message}"
                 )
                 return
             room_id = response.room_id
+            # Update the room ID in the matrix_rooms list
+            for room_config in matrix_rooms:
+                if room_config["id"] == room_id_or_alias:
+                    room_config["id"] = room_id
+                    break
+
         else:
             room_id = room_id_or_alias