diff --git a/requirements.txt b/requirements.txt
index 561ab8d..5423190 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ click==6.7
 cryptoconditions==0.6.0.dev1
 cryptography==2.3
 Flask==1.0.2
-Flask-Cors==3.0.4
+Flask-Cors==3.0.9
 Flask-RESTful==0.3.6
 gunicorn==19.8.1
 idna==2.6