diff --git a/common.gypi b/common.gypi
index b8db901423620c..de83a566724a36 100644
--- a/common.gypi
+++ b/common.gypi
@@ -36,7 +36,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.20',
+    'v8_embedder_string': '-node.21',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/src/flags/flag-definitions.h b/deps/v8/src/flags/flag-definitions.h
index 0d50ac1522ef87..340d770020a6d0 100644
--- a/deps/v8/src/flags/flag-definitions.h
+++ b/deps/v8/src/flags/flag-definitions.h
@@ -299,8 +299,7 @@ DEFINE_BOOL(js_shipping, true, "enable all shipped JavaScript features")
   V(harmony_set_methods, "harmony Set Methods")                       \
   V(harmony_import_attributes, "harmony import attributes")
 
-#define JAVASCRIPT_SHIPPING_FEATURES_BASE(V) \
-  V(js_promise_withresolvers, "Promise.withResolvers")
+#define JAVASCRIPT_SHIPPING_FEATURES_BASE(V)
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_SHIPPING(V) HARMONY_SHIPPING_BASE(V)
diff --git a/deps/v8/src/init/bootstrapper.cc b/deps/v8/src/init/bootstrapper.cc
index 0d5b3ec7e9a455..3b151ea3e86a16 100644
--- a/deps/v8/src/init/bootstrapper.cc
+++ b/deps/v8/src/init/bootstrapper.cc
@@ -3217,6 +3217,15 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
     InstallFunctionWithBuiltinId(isolate_, promise_fun, "reject",
                                  Builtin::kPromiseReject, 1, true);
 
+    std::array<Handle<Name>, 3> fields{factory->promise_string(),
+                                       factory->resolve_string(),
+                                       factory->reject_string()};
+    DirectHandle<Map> result_map =
+        CreateLiteralObjectMapFromCache(isolate_, fields);
+    native_context()->set_promise_withresolvers_result_map(*result_map);
+    InstallFunctionWithBuiltinId(isolate_, promise_fun, "withResolvers",
+                                 Builtin::kPromiseWithResolvers, 0, true);
+
     SetConstructorInstanceType(isolate_, promise_fun,
                                JS_PROMISE_CONSTRUCTOR_TYPE);
 
@@ -5445,23 +5454,6 @@ void Genesis::InitializeGlobal_harmony_iterator_helpers() {
 #undef ITERATOR_HELPERS
 }
 
-void Genesis::InitializeGlobal_js_promise_withresolvers() {
-  if (!v8_flags.js_promise_withresolvers) return;
-
-  Factory* factory = isolate()->factory();
-
-  std::array<Handle<Name>, 3> fields{factory->promise_string(),
-                                     factory->resolve_string(),
-                                     factory->reject_string()};
-  Handle<Map> result_map = CreateLiteralObjectMapFromCache(isolate(), fields);
-  native_context()->set_promise_withresolvers_result_map(*result_map);
-
-  Handle<JSFunction> promise_fun =
-      handle(native_context()->promise_function(), isolate());
-  InstallFunctionWithBuiltinId(isolate(), promise_fun, "withResolvers",
-                               Builtin::kPromiseWithResolvers, 0, true);
-}
-
 void Genesis::InitializeGlobal_harmony_set_methods() {
   if (!v8_flags.harmony_set_methods) return;
 
diff --git a/deps/v8/test/mjsunit/harmony/promise-withresolvers.js b/deps/v8/test/mjsunit/harmony/promise-withresolvers.js
index 9cb244a73fb653..9466a6ab5ba78c 100644
--- a/deps/v8/test/mjsunit/harmony/promise-withresolvers.js
+++ b/deps/v8/test/mjsunit/harmony/promise-withresolvers.js
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --js-promise-withresolvers --allow-natives-syntax
+// Flags: --allow-natives-syntax
 
 const desc = Object.getOwnPropertyDescriptor(Promise, 'withResolvers');
 assertTrue(desc.configurable);
diff --git a/deps/v8/test/test262/testcfg.py b/deps/v8/test/test262/testcfg.py
index ec4fad84078075..10b6243926396f 100644
--- a/deps/v8/test/test262/testcfg.py
+++ b/deps/v8/test/test262/testcfg.py
@@ -58,7 +58,6 @@
     'json-parse-with-source': '--harmony-json-parse-with-source',
     'iterator-helpers': '--harmony-iterator-helpers',
     'set-methods': '--harmony-set-methods',
-    'promise-with-resolvers': '--js-promise-withresolvers',
     'Array.fromAsync': '--harmony-array-from-async',
     'import-attributes': '--harmony-import-attributes',
     'regexp-duplicate-named-groups': '--js-regexp-duplicate-named-groups',