diff --git a/requirements.txt b/requirements.txt
index e674bb1..cb3c621 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 autopep8
 bcrypt
 defusedxml
-Django
+Django < 4
 django-anymail[mailgun]
 django-auth-ldap
 django-bootstrap4