diff --git a/edinburgh_materials/flask-demo/requirements.txt b/edinburgh_materials/flask-demo/requirements.txt
index bc74b25..c7c3fd6 100644
--- a/edinburgh_materials/flask-demo/requirements.txt
+++ b/edinburgh_materials/flask-demo/requirements.txt
@@ -29,6 +29,6 @@ requests==2.31.0
 six==1.12.0
 SQLAlchemy==1.3.5
 traitlets==4.3.2
-urllib3==1.26.5
+urllib3==1.26.19
 wcwidth==0.1.7
 Werkzeug==2.2.3