diff --git a/api/core/workflow/graph_engine/graph_engine.py b/api/core/workflow/graph_engine/graph_engine.py
index 361e2012d4..0a007bad96 100644
--- a/api/core/workflow/graph_engine/graph_engine.py
+++ b/api/core/workflow/graph_engine/graph_engine.py
@@ -3,7 +3,6 @@ import queue
 import threading
 import time
 from collections.abc import Generator
-from concurrent.futures import ThreadPoolExecutor
 from typing import Optional
 
 from flask import Flask, current_app