diff --git a/istio/example/bookinfo/src/productpage/requirements.txt b/istio/example/bookinfo/src/productpage/requirements.txt
index 37f99e8..30fff05 100644
--- a/istio/example/bookinfo/src/productpage/requirements.txt
+++ b/istio/example/bookinfo/src/productpage/requirements.txt
@@ -24,7 +24,7 @@ simplejson==3.16.0
 six==1.12.0
 threadloop==1.0.2
 thrift==0.11.0
-tornado==4.5.3
+tornado==6.3.3
 urllib3==1.26.5
 visitor==0.1.3
 Werkzeug==0.15.5