diff --git a/day4/myflaskapp/requirements/prod.txt b/day4/myflaskapp/requirements/prod.txt
index 9fae9b9..5ffb1ce 100644
--- a/day4/myflaskapp/requirements/prod.txt
+++ b/day4/myflaskapp/requirements/prod.txt
@@ -3,7 +3,7 @@
 # Flask
 Flask==1.0.2
 MarkupSafe==1.0
-Werkzeug==0.14.1
+Werkzeug==0.15.3
 Jinja2==2.10
 itsdangerous==1.1.0
 click>=5.0