diff --git a/appengine/standard_python3/building-an-app/building-an-app-1/requirements.txt b/appengine/standard_python3/building-an-app/building-an-app-1/requirements.txt
index 946ad917914..5aad892a97a 100644
--- a/appengine/standard_python3/building-an-app/building-an-app-1/requirements.txt
+++ b/appengine/standard_python3/building-an-app/building-an-app-1/requirements.txt
@@ -1 +1 @@
-Flask==2.1.0
+Flask==2.3.2