diff --git a/requirements.txt b/requirements.txt
index 629ad599..222e4b5a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 jsonschema>=2.4.0
-aiohttp>=1.3.1
+aiohttp==1.2.0
 aiohttp_cors>=0.4.0
 yarl>=0.9.6
 typing>=3.5.3.0 # Otherwise yarl fail with python 3.4