diff --git a/ext/dom/php_dom.stub.php b/ext/dom/php_dom.stub.php
index c7a08fa9933..42b0f1b356a 100644
--- a/ext/dom/php_dom.stub.php
+++ b/ext/dom/php_dom.stub.php
@@ -56,6 +56,7 @@ interface DOMChildNode
     public function replaceWith(...$nodes): void;
 }
 
+/** @not-serializable */
 class DOMNode
 {
     /** @readonly */
@@ -155,6 +156,7 @@ class DOMNode
     public function replaceChild(DOMNode $node, DOMNode $child) {}
 }
 
+/** @not-serializable */
 class DOMNameSpaceNode
 {
     /** @readonly */
@@ -654,6 +656,7 @@ class DOMProcessingInstruction extends DOMNode
 }
 
 #ifdef LIBXML_XPATH_ENABLED
+/** @not-serializable */
 class DOMXPath
 {
     /** @readonly */
diff --git a/ext/dom/php_dom_arginfo.h b/ext/dom/php_dom_arginfo.h
index 753f44acb4f..ff024d52f64 100644
--- a/ext/dom/php_dom_arginfo.h
+++ b/ext/dom/php_dom_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 3db2a5e01c88b189f2d58aa67b598653ebde6a76 */
+ * Stub hash: cff5c4b824da940f151617d08bb6b2419a9d26e9 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_OBJ_INFO_EX(arginfo_dom_import_simplexml, 0, 1, DOMElement, 0)
 	ZEND_ARG_TYPE_INFO(0, node, IS_OBJECT, 0)
@@ -989,6 +989,7 @@ static zend_class_entry *register_class_DOMNode(void)
 
 	INIT_CLASS_ENTRY(ce, "DOMNode", class_DOMNode_methods);
 	class_entry = zend_register_internal_class_ex(&ce, NULL);
+	class_entry->ce_flags |= ZEND_ACC_NOT_SERIALIZABLE;
 
 	zval property_nodeName_default_value;
 	ZVAL_UNDEF(&property_nodeName_default_value);
@@ -1103,6 +1104,7 @@ static zend_class_entry *register_class_DOMNameSpaceNode(void)
 
 	INIT_CLASS_ENTRY(ce, "DOMNameSpaceNode", class_DOMNameSpaceNode_methods);
 	class_entry = zend_register_internal_class_ex(&ce, NULL);
+	class_entry->ce_flags |= ZEND_ACC_NOT_SERIALIZABLE;
 
 	zval property_nodeName_default_value;
 	ZVAL_UNDEF(&property_nodeName_default_value);
@@ -1654,6 +1656,7 @@ static zend_class_entry *register_class_DOMXPath(void)
 
 	INIT_CLASS_ENTRY(ce, "DOMXPath", class_DOMXPath_methods);
 	class_entry = zend_register_internal_class_ex(&ce, NULL);
+	class_entry->ce_flags |= ZEND_ACC_NOT_SERIALIZABLE;
 
 	zend_string *property_document_class_DOMDocument = zend_string_init("DOMDocument", sizeof("DOMDocument")-1, 1);
 	zval property_document_default_value;
diff --git a/ext/dom/tests/not_serializable.phpt b/ext/dom/tests/not_serializable.phpt
new file mode 100644
index 00000000000..9869a8c87e3
--- /dev/null
+++ b/ext/dom/tests/not_serializable.phpt
@@ -0,0 +1,42 @@
+--TEST--
+DOM classes are not serializable
+--EXTENSIONS--
+dom
+--FILE--
+<?php
+
+$doc = new DOMDocument();
+$doc->loadXML('<root><node/></root>');
+try {
+    serialize($doc);
+} catch (Exception $e) {
+    echo $e->getMessage(), "\n";
+}
+
+$node = $doc->documentElement;
+try {
+    serialize($node);
+} catch (Exception $e) {
+    echo $e->getMessage(), "\n";
+}
+
+$xpath = new DOMXPath($doc);
+try {
+    serialize($xpath);
+} catch (Exception $e) {
+    echo $e->getMessage(), "\n";
+}
+
+$ns = $xpath->query('//namespace::*')->item(0);
+try {
+    serialize($ns);
+} catch (Exception $e) {
+    echo $e->getMessage(), "\n";
+}
+
+?>
+--EXPECT--
+Serialization of 'DOMDocument' is not allowed
+Serialization of 'DOMElement' is not allowed
+Serialization of 'DOMXPath' is not allowed
+Serialization of 'DOMNameSpaceNode' is not allowed