diff --git a/samples/mobile_backend/requirements.txt b/samples/mobile_backend/requirements.txt
index 81ccb55b..91551cfe 100644
--- a/samples/mobile_backend/requirements.txt
+++ b/samples/mobile_backend/requirements.txt
@@ -1,5 +1,5 @@
 Flask==0.10.1
-Jinja2==2.7.1
+Jinja2==3.1.3
 MarkupSafe==0.18
 Werkzeug==0.9.4
 httplib2==0.8