diff --git a/tests/test_lifespan_scoped_dependencies/testing_utilities.py b/tests/test_lifespan_scoped_dependencies/testing_utilities.py
index a6ad869c8..ac1fc0222 100644
--- a/tests/test_lifespan_scoped_dependencies/testing_utilities.py
+++ b/tests/test_lifespan_scoped_dependencies/testing_utilities.py
@@ -1,5 +1,6 @@
 from enum import Enum
-from typing import Any, AsyncGenerator, Generator, TypeVar, Union, assert_never
+from typing import Any, AsyncGenerator, Generator, TypeVar, Union
+from typing_extensions import assert_never
 
 from fastapi import APIRouter, FastAPI, WebSocket
 from starlette.testclient import TestClient