diff --git a/Chapter11/app/requirements.txt b/Chapter11/app/requirements.txt
index 5b5a84c..976d081 100644
--- a/Chapter11/app/requirements.txt
+++ b/Chapter11/app/requirements.txt
@@ -1,5 +1,5 @@
 Flask==1.0.2
-Flask-Cors==3.0.7
+Flask-Cors==3.0.9
 Flask-Jsonpify==1.5.0
 Flask-RESTful==0.3.7
 Flask-WTF==0.14.2