diff --git a/python/python-guestbook/src/frontend/requirements.txt b/python/python-guestbook/src/frontend/requirements.txt
index c0f1330a4..a0395b96f 100644
--- a/python/python-guestbook/src/frontend/requirements.txt
+++ b/python/python-guestbook/src/frontend/requirements.txt
@@ -1,4 +1,4 @@
-Flask==2.3.3
+Flask==3.1.3
 requests==2.31.0
 python-dateutil==2.8.2
 debugpy # Required for debugging