diff --git a/python/python-guestbook/src/backend/requirements.txt b/python/python-guestbook/src/backend/requirements.txt
index ab818773b..6e628755e 100644
--- a/python/python-guestbook/src/backend/requirements.txt
+++ b/python/python-guestbook/src/backend/requirements.txt
@@ -1,4 +1,4 @@
 Flask==2.3.3
 Flask-PyMongo==2.3.0
-bleach==5.0.1
+bleach==6.4.0
 debugpy # Required for debugging