diff --git a/Chapter04/Lie_to_me/requirements.txt b/Chapter04/Lie_to_me/requirements.txt
index a6ed908..1128c96 100644
--- a/Chapter04/Lie_to_me/requirements.txt
+++ b/Chapter04/Lie_to_me/requirements.txt
@@ -14,7 +14,7 @@ ipython-genutils==0.2.0
 isort==4.3.4
 itsdangerous==0.24
 jedi==0.11.1
-Jinja2==2.10
+Jinja2==2.11.3
 kiwisolver==1.0.1
 lazy-object-proxy==1.3.1
 MarkupSafe==1.0