diff --git a/example/restful_flask_example_with_sinon/requirement.txt b/example/restful_flask_example_with_sinon/requirement.txt
index 34574bd..bcc9aa7 100644
--- a/example/restful_flask_example_with_sinon/requirement.txt
+++ b/example/restful_flask_example_with_sinon/requirement.txt
@@ -4,7 +4,7 @@ click==6.7
 Flask==0.12
 Flask-RESTful==0.3.5
 itsdangerous==0.24
-Jinja2==2.9.5
+Jinja2==2.11.3
 MarkupSafe==0.23
 packaging==16.8
 pyparsing==2.1.10