diff --git a/i01Flask_By_Example/ch11MongoDB_to_caller/requirements.txt b/i01Flask_By_Example/ch11MongoDB_to_caller/requirements.txt
index f804014b..c9abb1c6 100644
--- a/i01Flask_By_Example/ch11MongoDB_to_caller/requirements.txt
+++ b/i01Flask_By_Example/ch11MongoDB_to_caller/requirements.txt
@@ -2,7 +2,7 @@ Flask==0.10.1
 Flask-Login==0.3.2
 Flask-WTF==0.12
 itsdangerous==0.24
-Jinja2==2.8
+Jinja2==2.11.3
 MarkupSafe==0.23
 Werkzeug==0.11.8
 WTForms==2.1