diff --git a/requirements.txt b/requirements.txt
index a3226dc..63b4ad3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ eth-tester==0.1.0b11
 eth-utils==0.8.1
 Flask==0.12.2
 Flask-Cache==0.13.1
-Flask-Cors==3.0.3
+Flask-Cors==3.0.9
 Flask-PyMongo==0.5.1
 Flask-RESTful==0.3.6
 gunicorn==19.7.1