diff --git a/deps/v8/include/v8.h b/deps/v8/include/v8.h
index 2f312e9b6280f4..dcdfbfc7ec58d1 100644
--- a/deps/v8/include/v8.h
+++ b/deps/v8/include/v8.h
@@ -5945,6 +5945,37 @@ class V8_EXPORT RegExp : public Object {
   static void CheckCast(Value* obj);
 };
 
+/**
+ * An instance of the built-in FinalizationRegistry constructor.
+ *
+ * The C++ name is FinalizationGroup for backwards compatibility. This API is
+ * experimental and deprecated.
+ */
+class V8_EXPORT FinalizationGroup : public Object {
+ public:
+  /**
+   * Runs the cleanup callback of the given FinalizationRegistry.
+   *
+   * V8 will inform the embedder that there are finalizer callbacks be
+   * called through HostCleanupFinalizationGroupCallback.
+   *
+   * HostCleanupFinalizationGroupCallback should schedule a task to
+   * call FinalizationGroup::Cleanup() at some point in the
+   * future. It's the embedders responsiblity to make this call at a
+   * time which does not interrupt synchronous ECMAScript code
+   * execution.
+   *
+   * If the result is Nothing<bool> then an exception has
+   * occurred. Otherwise the result is |true| if the cleanup callback
+   * was called successfully. The result is never |false|.
+   */
+  V8_DEPRECATED(
+      "FinalizationGroup cleanup is automatic if "
+      "HostCleanupFinalizationGroupCallback is not set")
+  static V8_WARN_UNUSED_RESULT Maybe<bool> Cleanup(
+      Local<FinalizationGroup> finalization_group);
+};
+
 /**
  * A JavaScript value that wraps a C++ void*. This type of value is mainly used
  * to associate C++ data structures with JavaScript objects.
@@ -7197,6 +7228,20 @@ typedef void (*AddCrashKeyCallback)(CrashKeyId id, const std::string& value);
 typedef void (*BeforeCallEnteredCallback)(Isolate*);
 typedef void (*CallCompletedCallback)(Isolate*);
 
+/**
+ * HostCleanupFinalizationGroupCallback is called when we require the
+ * embedder to enqueue a task that would call
+ * FinalizationGroup::Cleanup().
+ *
+ * The FinalizationGroup is the one for which the embedder needs to
+ * call FinalizationGroup::Cleanup() on.
+ *
+ * The context provided is the one in which the FinalizationGroup was
+ * created in.
+ */
+typedef void (*HostCleanupFinalizationGroupCallback)(
+    Local<Context> context, Local<FinalizationGroup> fg);
+
 /**
  * HostImportModuleDynamicallyCallback is called when we require the
  * embedder to load a module. This is used as part of the dynamic
@@ -8536,6 +8581,17 @@ class V8_EXPORT Isolate {
   void SetAbortOnUncaughtExceptionCallback(
       AbortOnUncaughtExceptionCallback callback);
 
+  /**
+   * This specifies the callback to be called when FinalizationRegistries
+   * are ready to be cleaned up and require FinalizationGroup::Cleanup()
+   * to be called in a future task.
+   */
+  V8_DEPRECATED(
+      "FinalizationRegistry cleanup is automatic if "
+      "HostCleanupFinalizationGroupCallback is not set")
+  void SetHostCleanupFinalizationGroupCallback(
+      HostCleanupFinalizationGroupCallback callback);
+
   /**
    * This specifies the callback called by the upcoming dynamic
    * import() language feature to load modules.
diff --git a/deps/v8/src/api/api-inl.h b/deps/v8/src/api/api-inl.h
index f686424286d8fe..0d2ad2f8a0f8ce 100644
--- a/deps/v8/src/api/api-inl.h
+++ b/deps/v8/src/api/api-inl.h
@@ -86,6 +86,7 @@ MAKE_TO_LOCAL(ToLocal, JSArrayBufferView, ArrayBufferView)
 MAKE_TO_LOCAL(ToLocal, JSDataView, DataView)
 MAKE_TO_LOCAL(ToLocal, JSTypedArray, TypedArray)
 MAKE_TO_LOCAL(ToLocalShared, JSArrayBuffer, SharedArrayBuffer)
+MAKE_TO_LOCAL(ToLocal, JSFinalizationRegistry, FinalizationGroup)
 
 TYPED_ARRAYS(MAKE_TO_LOCAL_TYPED_ARRAY)
 
diff --git a/deps/v8/src/api/api.cc b/deps/v8/src/api/api.cc
index 5b1c2b156b6e93..7f3c4bd36246ba 100644
--- a/deps/v8/src/api/api.cc
+++ b/deps/v8/src/api/api.cc
@@ -8298,6 +8298,33 @@ void Isolate::SetAbortOnUncaughtExceptionCallback(
   isolate->SetAbortOnUncaughtExceptionCallback(callback);
 }
 
+void Isolate::SetHostCleanupFinalizationGroupCallback(
+    HostCleanupFinalizationGroupCallback callback) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->SetHostCleanupFinalizationGroupCallback(callback);
+}
+
+Maybe<bool> FinalizationGroup::Cleanup(
+    Local<FinalizationGroup> finalization_group) {
+  i::Handle<i::JSFinalizationRegistry> fr =
+      Utils::OpenHandle(*finalization_group);
+  i::Isolate* isolate = fr->native_context().GetIsolate();
+  i::Handle<i::Context> i_context(fr->native_context(), isolate);
+  Local<Context> context = Utils::ToLocal(i_context);
+  ENTER_V8(isolate, context, FinalizationGroup, Cleanup, Nothing<bool>(),
+           i::HandleScope);
+  i::Handle<i::Object> callback(fr->cleanup(), isolate);
+  i::Handle<i::Object> argv[] = {callback};
+  fr->set_scheduled_for_cleanup(false);
+  has_pending_exception =
+      i::Execution::CallBuiltin(isolate,
+                                isolate->finalization_registry_cleanup_some(),
+                                fr, arraysize(argv), argv)
+          .is_null();
+  RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
+  return Just(true);
+}
+
 void Isolate::SetHostImportModuleDynamicallyCallback(
     HostImportModuleDynamicallyCallback callback) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
diff --git a/deps/v8/src/api/api.h b/deps/v8/src/api/api.h
index ad879657c99247..29cc4eacfd7338 100644
--- a/deps/v8/src/api/api.h
+++ b/deps/v8/src/api/api.h
@@ -94,6 +94,7 @@ class RegisteredExtension {
   V(Data, Object)                              \
   V(RegExp, JSRegExp)                          \
   V(Object, JSReceiver)                        \
+  V(FinalizationGroup, JSFinalizationRegistry) \
   V(Array, JSArray)                            \
   V(Map, JSMap)                                \
   V(Set, JSSet)                                \
@@ -206,6 +207,8 @@ class Utils {
       v8::internal::Handle<v8::internal::JSTypedArray> obj);
   static inline Local<BigUint64Array> ToLocalBigUint64Array(
       v8::internal::Handle<v8::internal::JSTypedArray> obj);
+  static inline Local<FinalizationGroup> ToLocal(
+      v8::internal::Handle<v8::internal::JSFinalizationRegistry> obj);
 
   static inline Local<SharedArrayBuffer> ToLocalShared(
       v8::internal::Handle<v8::internal::JSArrayBuffer> obj);
diff --git a/deps/v8/src/execution/isolate.cc b/deps/v8/src/execution/isolate.cc
index bea08a16b83524..2008bccb404a6e 100644
--- a/deps/v8/src/execution/isolate.cc
+++ b/deps/v8/src/execution/isolate.cc
@@ -3952,6 +3952,21 @@ MaybeHandle<JSPromise> Isolate::RunHostImportModuleDynamicallyCallback(
 
 void Isolate::ClearKeptObjects() { heap()->ClearKeptObjects(); }
 
+void Isolate::SetHostCleanupFinalizationGroupCallback(
+    HostCleanupFinalizationGroupCallback callback) {
+  host_cleanup_finalization_group_callback_ = callback;
+}
+
+void Isolate::RunHostCleanupFinalizationGroupCallback(
+    Handle<JSFinalizationRegistry> fr) {
+  if (host_cleanup_finalization_group_callback_ != nullptr) {
+    v8::Local<v8::Context> api_context =
+        v8::Utils::ToLocal(handle(Context::cast(fr->native_context()), this));
+    host_cleanup_finalization_group_callback_(api_context,
+                                              v8::Utils::ToLocal(fr));
+  }
+}
+
 void Isolate::SetHostImportModuleDynamicallyCallback(
     HostImportModuleDynamicallyCallback callback) {
   host_import_module_dynamically_callback_ = callback;
diff --git a/deps/v8/src/execution/isolate.h b/deps/v8/src/execution/isolate.h
index de00d862a3b87a..78c6ca4b47d6ed 100644
--- a/deps/v8/src/execution/isolate.h
+++ b/deps/v8/src/execution/isolate.h
@@ -1416,6 +1416,14 @@ class V8_EXPORT_PRIVATE Isolate final : private HiddenFactory {
   bool IsInAnyContext(Object object, uint32_t index);
 
   void ClearKeptObjects();
+  void SetHostCleanupFinalizationGroupCallback(
+      HostCleanupFinalizationGroupCallback callback);
+  HostCleanupFinalizationGroupCallback
+  host_cleanup_finalization_group_callback() const {
+    return host_cleanup_finalization_group_callback_;
+  }
+  void RunHostCleanupFinalizationGroupCallback(
+      Handle<JSFinalizationRegistry> fr);
 
   void SetHostImportModuleDynamicallyCallback(
       HostImportModuleDynamicallyCallback callback);
@@ -1672,6 +1680,8 @@ class V8_EXPORT_PRIVATE Isolate final : private HiddenFactory {
   v8::Isolate::AtomicsWaitCallback atomics_wait_callback_ = nullptr;
   void* atomics_wait_callback_data_ = nullptr;
   PromiseHook promise_hook_ = nullptr;
+  HostCleanupFinalizationGroupCallback
+      host_cleanup_finalization_group_callback_ = nullptr;
   HostImportModuleDynamicallyCallback host_import_module_dynamically_callback_ =
       nullptr;
   HostInitializeImportMetaObjectCallback
diff --git a/deps/v8/src/heap/finalization-registry-cleanup-task.cc b/deps/v8/src/heap/finalization-registry-cleanup-task.cc
index 2acfa31ffbae37..93997c91b6e401 100644
--- a/deps/v8/src/heap/finalization-registry-cleanup-task.cc
+++ b/deps/v8/src/heap/finalization-registry-cleanup-task.cc
@@ -37,6 +37,7 @@ void FinalizationRegistryCleanupTask::SlowAssertNoActiveJavaScript() {
 
 void FinalizationRegistryCleanupTask::RunInternal() {
   Isolate* isolate = heap_->isolate();
+  DCHECK(!isolate->host_cleanup_finalization_group_callback());
   SlowAssertNoActiveJavaScript();
 
   TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8",
diff --git a/deps/v8/src/heap/heap.cc b/deps/v8/src/heap/heap.cc
index 606ba0fe65fa45..d035fece83b799 100644
--- a/deps/v8/src/heap/heap.cc
+++ b/deps/v8/src/heap/heap.cc
@@ -1201,6 +1201,16 @@ void Heap::GarbageCollectionEpilogue() {
     TRACE_GC(tracer(), GCTracer::Scope::HEAP_EPILOGUE_REDUCE_NEW_SPACE);
     ReduceNewSpaceSize();
   }
+
+  if (FLAG_harmony_weak_refs &&
+      isolate()->host_cleanup_finalization_group_callback()) {
+    HandleScope handle_scope(isolate());
+    Handle<JSFinalizationRegistry> finalization_registry;
+    while (
+        DequeueDirtyJSFinalizationRegistry().ToHandle(&finalization_registry)) {
+      isolate()->RunHostCleanupFinalizationGroupCallback(finalization_registry);
+    }
+  }
 }
 
 class GCCallbacksScope {
@@ -6208,6 +6218,7 @@ void Heap::SetInterpreterEntryTrampolineForProfiling(Code code) {
 }
 
 void Heap::PostFinalizationRegistryCleanupTaskIfNeeded() {
+  DCHECK(!isolate()->host_cleanup_finalization_group_callback());
   // Only one cleanup task is posted at a time.
   if (!HasDirtyJSFinalizationRegistries() ||
       is_finalization_registry_cleanup_task_posted_) {
@@ -6267,6 +6278,7 @@ MaybeHandle<JSFinalizationRegistry> Heap::DequeueDirtyJSFinalizationRegistry() {
 
 void Heap::RemoveDirtyFinalizationRegistriesOnContext(NativeContext context) {
   if (!FLAG_harmony_weak_refs) return;
+  if (isolate()->host_cleanup_finalization_group_callback()) return;
 
   DisallowHeapAllocation no_gc;
 
diff --git a/deps/v8/src/heap/mark-compact.cc b/deps/v8/src/heap/mark-compact.cc
index a7e1c93e1f49d0..53c215e2349a9a 100644
--- a/deps/v8/src/heap/mark-compact.cc
+++ b/deps/v8/src/heap/mark-compact.cc
@@ -2537,7 +2537,9 @@ void MarkCompactCollector::ClearJSWeakRefs() {
       RecordSlot(weak_cell, slot, HeapObject::cast(*slot));
     }
   }
-  heap()->PostFinalizationRegistryCleanupTaskIfNeeded();
+  if (!isolate()->host_cleanup_finalization_group_callback()) {
+    heap()->PostFinalizationRegistryCleanupTaskIfNeeded();
+  }
 }
 
 void MarkCompactCollector::AbortWeakObjects() {
diff --git a/deps/v8/src/logging/counters.h b/deps/v8/src/logging/counters.h
index 02a6feee2e3d65..5c1aa81788eaf8 100644
--- a/deps/v8/src/logging/counters.h
+++ b/deps/v8/src/logging/counters.h
@@ -772,6 +772,7 @@ class RuntimeCallTimer final {
   V(Int8Array_New)                                         \
   V(Isolate_DateTimeConfigurationChangeNotification)       \
   V(Isolate_LocaleConfigurationChangeNotification)         \
+  V(FinalizationGroup_Cleanup)                             \
   V(JSON_Parse)                                            \
   V(JSON_Stringify)                                        \
   V(Map_AsArray)                                           \