diff --git a/deps/v8/include/v8.h b/deps/v8/include/v8.h
index 7988b58361e419..6257939bd93a2c 100644
--- a/deps/v8/include/v8.h
+++ b/deps/v8/include/v8.h
@@ -4176,12 +4176,20 @@ class V8_EXPORT ArrayBuffer : public Object {
      */
     virtual void* AllocateUninitialized(size_t length) = 0;
 
+    virtual void* Reserve(size_t length);
+
     /**
      * Free the memory block of size |length|, pointed to by |data|.
      * That memory is guaranteed to be previously allocated by |Allocate|.
      */
     virtual void Free(void* data, size_t length) = 0;
 
+    enum class AllocationMode { kNormal, kReservation };
+    virtual void Free(void* data, size_t length, AllocationMode mode);
+    enum class Protection { kNoAccess, kReadWrite };
+    virtual void SetProtection(void* data, size_t length,
+                               Protection protection);
+
     /**
      * malloc/free based convenience allocator.
      *
diff --git a/deps/v8/src/api.cc b/deps/v8/src/api.cc
index 74d8768d4d5fe8..b4a9d177a7b36c 100644
--- a/deps/v8/src/api.cc
+++ b/deps/v8/src/api.cc
@@ -437,6 +437,18 @@ void V8::SetSnapshotDataBlob(StartupData* snapshot_blob) {
   i::V8::SetSnapshotBlob(snapshot_blob);
 }
 
+void* v8::ArrayBuffer::Allocator::Reserve(size_t length) { UNIMPLEMENTED(); }
+
+void v8::ArrayBuffer::Allocator::Free(void* data, size_t length,
+                                      AllocationMode mode) {
+  UNIMPLEMENTED();
+}
+
+void v8::ArrayBuffer::Allocator::SetProtection(
+    void* data, size_t length,
+    v8::ArrayBuffer::Allocator::Protection protection) {
+  UNIMPLEMENTED();
+}
 
 namespace {