diff --git a/requirements.txt b/requirements.txt
index 3f93aa1..f545fe4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ docutils==0.14
 ecdsa==0.13
 Flask==1.0.2
 Flask-RESTful==0.3.7
-flask-cors==3.0.7
+flask-cors==3.0.9
 future==0.17.1
 gunicorn==19.9.0
 idna==2.8