diff --git a/dagflow/dagflow.py b/dagflow/dagflow.py
index 479bc34..e39ebe4 100644
--- a/dagflow/dagflow.py
+++ b/dagflow/dagflow.py
@@ -11,6 +11,7 @@ Features:
 - RBAC-based task assignment
 - Query APIs for UI
 """
+import asyncio
 from appPublic.log import debug
 from sqlor.dbpools import get_sor_context