diff --git a/graph_tutorial/requirements.txt b/graph_tutorial/requirements.txt
index 40ce9a1..119e219 100644
--- a/graph_tutorial/requirements.txt
+++ b/graph_tutorial/requirements.txt
@@ -1,5 +1,5 @@
 Django==5.2.1;python_version>"3.9"
 Django==4.2.20;python_version<="3.9"
 msal==1.39.0
-python-dateutil==3.0.0
+python-dateutil==4.0.0
 PyYAML==6.0.3