diff --git a/testing/requirements.txt b/testing/requirements.txt
index 27a0b3cb7..b1a29542f 100644
--- a/testing/requirements.txt
+++ b/testing/requirements.txt
@@ -17,4 +17,4 @@ grpcio
 pytest-asyncio; python_version > '3.0'
 aioresponses; python_version > '3.0'
 asynctest; python_version > '3.0'
-aiohttp; python_version > '3.0'
+aiohttp < 3.10.0; python_version > '3.0'