diff --git a/tox.ini b/tox.ini
index b72d43b..44f803d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -25,7 +25,7 @@ deps =
     {py27,py35,py36,pypy}-tornado4: pytest-tornado
     {py27,py35,py36}-tornado4: pycurl
     boto3: boto3
-    aiohttp: aiohttp
+    aiohttp: aiohttp<3
     aiohttp: pytest-asyncio
 
 [flake8]