diff --git a/deps/v8/include/v8-version.h b/deps/v8/include/v8-version.h
index e769d42101e818..460ec45badd30c 100644
--- a/deps/v8/include/v8-version.h
+++ b/deps/v8/include/v8-version.h
@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 12
 #define V8_MINOR_VERSION 4
 #define V8_BUILD_NUMBER 254
-#define V8_PATCH_LEVEL 17
+#define V8_PATCH_LEVEL 18
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
diff --git a/deps/v8/src/builtins/builtins-array.cc b/deps/v8/src/builtins/builtins-array.cc
index 60dc19367aa389..dc82b658df09e5 100644
--- a/deps/v8/src/builtins/builtins-array.cc
+++ b/deps/v8/src/builtins/builtins-array.cc
@@ -51,7 +51,7 @@ inline bool HasOnlySimpleElements(Isolate* isolate,
   DisallowGarbageCollection no_gc;
   PrototypeIterator iter(isolate, receiver, kStartAtReceiver);
   for (; !iter.IsAtEnd(); iter.Advance()) {
-    if (IsJSProxy(iter.GetCurrent())) return false;
+    if (!IsJSObject(iter.GetCurrent())) return false;
     Tagged<JSObject> current = iter.GetCurrent<JSObject>();
     if (!HasSimpleElements(current)) return false;
   }