diff --git a/django-cas-server/requirements.txt b/django-cas-server/requirements.txt
index 5ac7318..7ee3d09 100644
--- a/django-cas-server/requirements.txt
+++ b/django-cas-server/requirements.txt
@@ -1,4 +1,5 @@
 django-cas-server
 gunicorn
+ldap3
 psycopg2
 whitenoise