diff --git a/requirements.txt b/requirements.txt
index 0ab80435..e9ebc9ec 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,7 @@
 jsonschema>=2.4.0
 aiohttp>=1.1.3
 aiohttp_cors>=0.4.0
+yarl>=0.7.0
 Jinja2>=2.7.3
 raven>=5.23.0
 psutil>=3.0.0