diff --git a/web/flask/mega_tutorial/chapter16-elasticsearch/app/requirements.txt b/web/flask/mega_tutorial/chapter16-elasticsearch/app/requirements.txt
index 454923d..185a3a5 100644
--- a/web/flask/mega_tutorial/chapter16-elasticsearch/app/requirements.txt
+++ b/web/flask/mega_tutorial/chapter16-elasticsearch/app/requirements.txt
@@ -38,5 +38,5 @@ SQLAlchemy==1.3.8
 sqlparse==0.3.0
 urllib3==1.25.3
 visitor==0.1.3
-Werkzeug==0.15.5
+Werkzeug==2.2.3
 WTForms==2.2.1