diff --git a/app/ch06_routing/starter/requirements.txt b/app/ch06_routing/starter/requirements.txt
index 7e106024..c23dd5b5 100644
--- a/app/ch06_routing/starter/requirements.txt
+++ b/app/ch06_routing/starter/requirements.txt
@@ -1 +1,2 @@
 flask
+werkzeug>=3.0.6 # not directly required, pinned by Snyk to avoid a vulnerability