diff --git a/requirements.txt b/requirements.txt
index b58003eb..c6f78f1c 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>=0.7.0
+typing>=3.5.3.0 # Otherwise yarl fail with python 3.4 
 Jinja2>=2.7.3
 raven>=5.2.0
 psutil>=3.0.0