diff --git a/samples/bookinfo/src/productpage/requirements.txt b/samples/bookinfo/src/productpage/requirements.txt
index 6f275185c4f0..ab36d1369220 100644
--- a/samples/bookinfo/src/productpage/requirements.txt
+++ b/samples/bookinfo/src/productpage/requirements.txt
@@ -2,7 +2,7 @@ certifi==2017.11.5
 chardet==3.0.4
 click==6.7
 dominate==2.3.1
-Flask==0.12.3
+Flask==2.3.2
 Flask-Bootstrap==3.3.7.1
 Flask-JSON==0.3.2
 gevent==1.2.2