diff --git a/example/mongodb/requirements.txt b/example/mongodb/requirements.txt
index 150090d..29f9238 100644
--- a/example/mongodb/requirements.txt
+++ b/example/mongodb/requirements.txt
@@ -35,5 +35,5 @@ simplejson==3.10.0
 six==1.10.0
 speaklater==1.3
 uritemplate==3.0.0
-Werkzeug==0.11.15
+Werkzeug==0.15.3
 WTForms==2.1