diff --git a/flake.lock b/flake.lock
index e630c2d..c71d36b 100644
--- a/flake.lock
+++ b/flake.lock
@@ -203,11 +203,11 @@
     "ldap-sync": {
       "flake": false,
       "locked": {
-        "lastModified": 1731935440,
-        "narHash": "sha256-hMVN9As58cqqiu9JQaS4ffmzhG4xV01QhNKsTP5BF9c=",
+        "lastModified": 1732122980,
+        "narHash": "sha256-RRwJR4JFMH7jXjtBE1QqO8Tcd6j9j2Zvy2M7Ff8WLfM=",
         "ref": "refs/heads/main",
-        "rev": "4b4b76543b298f0db15644c308c3a4deaaa4dbdd",
-        "revCount": 17,
+        "rev": "20a07fe35505e5b8b0dd525ba42461fb2e82ce2a",
+        "revCount": 24,
         "type": "git",
         "url": "https://gogs.informatik.hs-fulda.de/fooker/ldap-sync.git"
       },
diff --git a/machines/ldap/ldap.nix b/machines/ldap/ldap.nix
index 3d3ee0a..32694da 100644
--- a/machines/ldap/ldap.nix
+++ b/machines/ldap/ldap.nix
@@ -85,6 +85,12 @@ in
             # Increase max DB size to fit all the users
             olcDbMaxSize = "10737418240";
 
+            olcDbIndex = [
+              "uid,uidNumber pres,eq"
+              "cn,sn pres,eq,sub"
+              "objectClass eq"
+            ];
+
             olcAccess = [
               # Custom access rules for userPassword attributes
               ''{0}to attrs=userPassword