diff --git a/api/tests/unit_tests/controllers/console/app/test_annotation_security.py b/api/tests/unit_tests/controllers/console/app/test_annotation_security.py
index 495ba732af..c3403c71a9 100644
--- a/api/tests/unit_tests/controllers/console/app/test_annotation_security.py
+++ b/api/tests/unit_tests/controllers/console/app/test_annotation_security.py
@@ -9,7 +9,6 @@ import io
 from unittest.mock import MagicMock, patch
 
 import pytest
-from flask import Flask
 from werkzeug.datastructures import FileStorage
 
 from configs import dify_config
@@ -321,6 +320,7 @@ class TestAnnotationImportTaskOptimization:
         # Soft limit should be 5 minutes (300s)
         # Note: actual values depend on Celery configuration
 
+
 class TestConfigurationValues:
     """Test that security configuration values are properly set."""