diff --git a/tests/test_integrations_fastapi.py b/tests/test_integrations_fastapi.py
index 1cf6764..3c65abd 100644
--- a/tests/test_integrations_fastapi.py
+++ b/tests/test_integrations_fastapi.py
@@ -145,7 +145,7 @@ async def get_current_user_permission(
 @pytest_asyncio.fixture
 async def test_client(fastapi_app: FastAPI) -> AsyncGenerator[httpx.AsyncClient, None]:
     async with httpx.AsyncClient(
-        app=fastapi_app, base_url="http://api.bretagne.duchy"
+        transport=httpx.ASGITransport(fastapi_app), base_url="http://api.bretagne.duchy"
     ) as test_client:
         yield test_client