diff --git a/master/requirements.txt b/master/requirements.txt
index 5ca388e..cad4ebf 100644
--- a/master/requirements.txt
+++ b/master/requirements.txt
@@ -26,7 +26,7 @@ flake8==3.5.0
 flaky==3.4.0
 flasgger==0.8.0
 Flask==0.12.1
-Flask-Cors==3.0.3
+Flask-Cors==3.0.9
 Flask-SocketIO==2.9.2
 Flask-WTF==0.14.2
 ftfy==4.4.2