diff --git a/NEWS b/NEWS
index 7980ff66c44..ea0579e63c3 100644
--- a/NEWS
+++ b/NEWS
@@ -13,6 +13,7 @@ PHP                                                                        NEWS
 - DOM:
   . Fixed bug GH-15192 (Segmentation fault in dom extension
     (html5_serializer)). (nielsdos)
+  . Deprecated DOM_PHP_ERR constant. (nielsdos)
 
 - PHPDBG:
   . array out of bounds, stack overflow handled for segfault handler on windows.
diff --git a/UPGRADING b/UPGRADING
index 96bb46e1394..76a15ff24f1 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -409,6 +409,10 @@ PHP 8.4 UPGRADE NOTES
     the associated date_sunset() and date_sunrise() functions in PHP 8.1.
     RFC: https://wiki.php.net/rfc/deprecations_php_8_4
 
+- DOM:
+  . Deprecated DOM_PHP_ERR constant.
+    RFC: https://wiki.php.net/rfc/deprecations_php_8_4#deprecate_dom_php_err_constant
+
 - Intl:
   . Calling intlcal_set() as well as calling IntlCalendar::set() with
     more than 2 arguments is deprecated. Use either IntlCalendar::setDate()
diff --git a/ext/dom/php_dom.stub.php b/ext/dom/php_dom.stub.php
index f678c7376d1..65cf64989d9 100644
--- a/ext/dom/php_dom.stub.php
+++ b/ext/dom/php_dom.stub.php
@@ -147,6 +147,7 @@ namespace
 
     /**
      * @var int
+     * @deprecated is no longer used since 8.4
      * @cvalue PHP_ERR
      */
     const DOM_PHP_ERR = UNKNOWN;
diff --git a/ext/dom/php_dom_arginfo.h b/ext/dom/php_dom_arginfo.h
index 90db1e81af0..c8167234e87 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: 9a1e6842b2c5b891e11087d40aa8c9f56a2269a3 */
+ * Stub hash: 09b3f1df4ce6b20e7d25214a522ea1e6e5faabf4 */
 
 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)
@@ -1973,7 +1973,7 @@ static void register_php_dom_symbols(int module_number)
 	REGISTER_LONG_CONSTANT("XML_ATTRIBUTE_NMTOKENS", XML_ATTRIBUTE_NMTOKENS, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("XML_ATTRIBUTE_ENUMERATION", XML_ATTRIBUTE_ENUMERATION, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("XML_ATTRIBUTE_NOTATION", XML_ATTRIBUTE_NOTATION, CONST_PERSISTENT);
-	REGISTER_LONG_CONSTANT("DOM_PHP_ERR", PHP_ERR, CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("DOM_PHP_ERR", PHP_ERR, CONST_PERSISTENT | CONST_DEPRECATED);
 	REGISTER_LONG_CONSTANT("DOM_INDEX_SIZE_ERR", INDEX_SIZE_ERR, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("DOMSTRING_SIZE_ERR", DOMSTRING_SIZE_ERR, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("DOM_HIERARCHY_REQUEST_ERR", HIERARCHY_REQUEST_ERR, CONST_PERSISTENT);
diff --git a/ext/dom/tests/DOM_PHP_ERR_deprecated.phpt b/ext/dom/tests/DOM_PHP_ERR_deprecated.phpt
new file mode 100644
index 00000000000..76bd2757e7b
--- /dev/null
+++ b/ext/dom/tests/DOM_PHP_ERR_deprecated.phpt
@@ -0,0 +1,11 @@
+--TEST--
+Test deprecation emitted on accessing DOM_PHP_ERR
+--EXTENSIONS--
+dom
+--FILE--
+<?php
+var_dump(DOM_PHP_ERR);
+?>
+--EXPECTF--
+Deprecated: Constant DOM_PHP_ERR is deprecated in %s on line %d
+int(0)