diff --git a/edinburgh_materials/flask-demo/requirements.txt b/edinburgh_materials/flask-demo/requirements.txt
index bc74b25..1b39e10 100644
--- a/edinburgh_materials/flask-demo/requirements.txt
+++ b/edinburgh_materials/flask-demo/requirements.txt
@@ -14,7 +14,7 @@ ipython==8.10.0
 ipython-genutils==0.2.0
 itsdangerous==1.1.0
 jedi==0.14.0
-Jinja2==2.11.3
+Jinja2==3.1.4
 MarkupSafe==1.1.1
 parso==0.5.0
 pexpect==4.7.0