diff --git a/api/src/Accounts/Ads.php b/api/src/Accounts/Ads.php
index 91efee4b1b..dbfe9424ab 100644
--- a/api/src/Accounts/Ads.php
+++ b/api/src/Accounts/Ads.php
@@ -1445,6 +1445,22 @@ class adLDAP extends \adLDAP
 		parent::__construct($options);
 	}
 
+	/**
+	 * Magic method called when object gets serialized
+	 *
+	 * We do NOT store ldapConnection, as we need to reconnect anyway.
+	 * PHP 8.1 gives an error when trying to serialize LDAP\Connection object!
+	 *
+	 * @return array
+	 */
+	function __sleep()
+	{
+		$vars = get_object_vars($this);
+		unset($vars['ldapConnection']);
+		unset($this->ldapConnection);
+		return array_keys($vars);
+	}
+
 	/**
     * Convert 8bit characters e.g. accented characters to UTF8 encoded characters
     *
@@ -1851,4 +1867,4 @@ class adLDAPUtils extends \adLDAPUtils
         	$str
     	);
     }
-}
+}
\ No newline at end of file
diff --git a/api/src/Accounts/Ldap.php b/api/src/Accounts/Ldap.php
index a7359d2bbd..bd183b677e 100644
--- a/api/src/Accounts/Ldap.php
+++ b/api/src/Accounts/Ldap.php
@@ -1294,6 +1294,22 @@ class Ldap
 		return $id;
 	}
 
+	/**
+	 * Magic method called when object gets serialized
+	 *
+	 * We do NOT store ldapConnection, as we need to reconnect anyway.
+	 * PHP 8.1 gives an error when trying to serialize LDAP\Connection object!
+	 *
+	 * @return array
+	 */
+	function __sleep()
+	{
+		$vars = get_object_vars($this);
+		unset($vars['ds']);
+		unset($this->ds);
+		return array_keys($vars);
+	}
+
 	/**
 	 * __wakeup function gets called by php while unserializing the object to reconnect with the ldap server
 	 */
@@ -1302,4 +1318,4 @@ class Ldap
 		$this->ds = Api\Ldap::factory(true, $this->frontend->config['ldap_host'],
 			$this->frontend->config['ldap_root_dn'],$this->frontend->config['ldap_root_pw']);
 	}
-}
+}
\ No newline at end of file
diff --git a/api/src/Contacts/Ldap.php b/api/src/Contacts/Ldap.php
index 0c2166d4da..af40afb50c 100644
--- a/api/src/Contacts/Ldap.php
+++ b/api/src/Contacts/Ldap.php
@@ -360,6 +360,22 @@ class Ldap
 		$this->accountsFilter = "(&$this->accountsFilter$accounts_filter)";
 	}
 
+	/**
+	 * Magic method called when object gets serialized
+	 *
+	 * We do NOT store ldapConnection, as we need to reconnect anyway.
+	 * PHP 8.1 gives an error when trying to serialize LDAP\Connection object!
+	 *
+	 * @return array
+	 */
+	function __sleep()
+	{
+		$vars = get_object_vars($this);
+		unset($vars['ds']);
+		unset($this->ds);
+		return array_keys($vars);
+	}
+
 	/**
 	 * __wakeup function gets called by php while unserializing the object to reconnect with the ldap server
 	 */
@@ -1623,4 +1639,4 @@ class Ldap
 	{
 		error_log(__METHOD__."($account_id,$new_owner) not yet implemented");
 	}
-}
+}
\ No newline at end of file