diff --git a/examples/heroku/requirements.txt b/examples/heroku/requirements.txt
index 24cc3e223..f7e49a5f8 100644
--- a/examples/heroku/requirements.txt
+++ b/examples/heroku/requirements.txt
@@ -1,3 +1,4 @@
 slack_bolt
 Flask>=1.1
-gunicorn>=20
\ No newline at end of file
+gunicorn>=20
+werkzeug>=3.1.4 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file