diff --git a/requirements.txt b/requirements.txt
index 15825e4c..f79cf434 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,7 @@ jsonschema>=2.4.0
 aiohttp>=1.2.0
 aiohttp_cors>=0.4.0
 yarl>=0.8.1
+typing>=3.5.3.0 # Otherwise yarl fail with python 3.4 
 Jinja2>=2.7.3
 raven>=5.23.0
 psutil>=3.0.0