diff --git a/requirements.txt b/requirements.txt
index 2a11681b..da2ab028 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 jsonschema>=2.4.0
-aiohttp==1.3.3
+aiohttp>=1.3.0,<=1.4.0
 aiohttp_cors>=0.4.0
 yarl>=0.9.6
 typing>=3.5.3.0 # Otherwise yarl fail with python 3.4