diff --git a/api/core/workflow/entities/variable_pool.py b/api/core/workflow/entities/variable_pool.py
index eefee88c07..e84044dede 100644
--- a/api/core/workflow/entities/variable_pool.py
+++ b/api/core/workflow/entities/variable_pool.py
@@ -1,5 +1,5 @@
 from enum import Enum
-from typing import Optional, Union, Any
+from typing import Any, Optional, Union
 
 from core.workflow.entities.node_entities import SystemVariable