diff --git a/config.xml b/config.xml
index ea024a8794e38749bbbb3ef6b58cb3952c6aee8f..f4b8c78c8b3b6969587974f736756295e8c8bb50 100644
--- a/config.xml
+++ b/config.xml
@@ -206,7 +206,7 @@
     <permission>org.jenkins.plugins.lockableresources.LockableResourcesManager.Unlock:scott</permission>
     <permission>org.jenkins.plugins.lockableresources.LockableResourcesManager.View:20180082</permission>
   </authorizationStrategy>
-  <securityRealm class="hudson.security.LDAPSecurityRealm" plugin="ldap@1.20">
+  <securityRealm class="hudson.security.LDAPSecurityRealm" plugin="ldap@1.21">
     <disableMailAddressResolver>false</disableMailAddressResolver>
     <configurations>
       <jenkins.security.plugins.ldap.LDAPConfiguration>