diff --git a/core/model/modx/modsessionhandler.class.php b/core/model/modx/modsessionhandler.class.php
index a9ae6b9b71..1efd564d00 100644
--- a/core/model/modx/modsessionhandler.class.php
+++ b/core/model/modx/modsessionhandler.class.php
@@ -13,7 +13,7 @@
  *
  * @package modx
  */
-class modSessionHandler {
+class modSessionHandler implements SessionHandlerInterface {
     /**
      * @var modX A reference to the modX instance controlling this session
      * handler.
@@ -60,11 +60,14 @@ function __construct(modX &$modx) {
     /**
      * Opens the connection for the session handler.
      *
+     * @param $path
+     * @param $name
      * @access public
      * @return boolean Always returns true; actual connection is managed by
      * {@link modX}.
      */
-    public function open() {
+    #[\ReturnTypeWillChange]
+    public function open($path, $name) {
         return true;
     }
 
@@ -75,6 +78,7 @@ public function open() {
      * @return boolean Always returns true; actual connection is managed by
      * {@link modX}
      */
+    #[\ReturnTypeWillChange]
     public function close() {
         return true;
     }
@@ -86,6 +90,7 @@ public function close() {
      * @param integer $id The pk of the {@link modSession} object.
      * @return string The data read from the {@link modSession} object.
      */
+    #[\ReturnTypeWillChange]
     public function read($id) {
         if ($this->_getSession($id)) {
             $data= $this->session->get('data');
@@ -103,6 +108,7 @@ public function read($id) {
      * @param mixed $data The data to write to the session.
      * @return boolean True if successfully written.
      */
+    #[\ReturnTypeWillChange]
     public function write($id, $data) {
         $written= false;
         if ($this->_getSession($id, true)) {
@@ -122,6 +128,7 @@ public function write($id, $data) {
      * @param integer $id
      * @return boolean True if the session record was destroyed.
      */
+    #[\ReturnTypeWillChange]
     public function destroy($id) {
         if ($this->_getSession($id)) {
             $destroyed= $this->session->remove();
@@ -139,6 +146,7 @@ public function destroy($id) {
      * longer than.
      * @return boolean True if session records were removed.
      */
+    #[\ReturnTypeWillChange]
     public function gc($max) {
         $maxtime= time() - $this->gcMaxLifetime;
         return $this->modx->removeCollection('modSession', array("{$this->modx->escape('access')} < {$maxtime}"));
diff --git a/core/model/modx/modx.class.php b/core/model/modx/modx.class.php
index fa05d4ee18..8f4f415f8d 100644
--- a/core/model/modx/modx.class.php
+++ b/core/model/modx/modx.class.php
@@ -2564,14 +2564,18 @@ protected function _initSession($options = null) {
                 if ($sessionHandlerClass = $this->getOption('session_handler_class', $options)) {
                     if ($shClass = $this->loadClass($sessionHandlerClass, '', false, true)) {
                         if ($sh = new $shClass($this)) {
-                            session_set_save_handler(
-                                array (& $sh, 'open'),
-                                array (& $sh, 'close'),
-                                array (& $sh, 'read'),
-                                array (& $sh, 'write'),
-                                array (& $sh, 'destroy'),
-                                array (& $sh, 'gc')
-                            );
+                            if ($sh instanceof SessionHandlerInterface) {
+                                session_set_save_handler($sh);
+                            } elseif (version_compare(phpversion(), '8.4.0', '<')) {
+                                session_set_save_handler(
+                                    [& $sh, 'open'],
+                                    [& $sh, 'close'],
+                                    [& $sh, 'read'],
+                                    [& $sh, 'write'],
+                                    [& $sh, 'destroy'],
+                                    [& $sh, 'gc']
+                                );
+                            }
                         }
                     }
                 }