diff --git a/app/settings.py b/app/settings.py
index b2e52af..5d810d2 100644
--- a/app/settings.py
+++ b/app/settings.py
@@ -169,7 +169,7 @@ LOGGING = {
 
 CAS_AUTH_CLASS = "cas_server.auth.LdapAuthUser"
 CAS_LDAP_SERVER = ldap3.Server(
-    "ldaps://ldap.spi.ens.fr:6636",
+    "ldaps://ldap.spi.ens.fr:636",
     get_info=ldap3.ALL,
     tls=ldap3.Tls(
         validate=ssl.CERT_REQUIRED,