diff --git a/common.gypi b/common.gypi
index ca1f853172063a..10b4ecfc52e2fb 100644
--- a/common.gypi
+++ b/common.gypi
@@ -39,7 +39,7 @@
 
     # 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.12',
+    'v8_embedder_string': '-node.13',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/src/snapshot/serializer.cc b/deps/v8/src/snapshot/serializer.cc
index 9eefbe2c481ac9..b2dd6a33e7fb7d 100644
--- a/deps/v8/src/snapshot/serializer.cc
+++ b/deps/v8/src/snapshot/serializer.cc
@@ -115,10 +115,12 @@ void Serializer::SerializeRootObject(Object object) {
 }
 
 #ifdef DEBUG
-void Serializer::PrintStack() {
+void Serializer::PrintStack() { PrintStack(std::cout); }
+
+void Serializer::PrintStack(std::ostream& out) {
   for (const auto o : stack_) {
-    o.Print();
-    PrintF("\n");
+    o.Print(out);
+    out << "\n";
   }
 }
 #endif  // DEBUG
diff --git a/deps/v8/src/snapshot/serializer.h b/deps/v8/src/snapshot/serializer.h
index c9e7fada80e1db..b70c7fd45a9b23 100644
--- a/deps/v8/src/snapshot/serializer.h
+++ b/deps/v8/src/snapshot/serializer.h
@@ -250,6 +250,7 @@ class Serializer : public SerializerDeserializer {
   void PushStack(HeapObject o) { stack_.push_back(o); }
   void PopStack() { stack_.pop_back(); }
   void PrintStack();
+  void PrintStack(std::ostream&);
 #endif  // DEBUG
 
   SerializerReferenceMap* reference_map() { return &reference_map_; }
diff --git a/deps/v8/src/snapshot/startup-serializer.cc b/deps/v8/src/snapshot/startup-serializer.cc
index 62a786f984149f..6ad2efc18b8438 100644
--- a/deps/v8/src/snapshot/startup-serializer.cc
+++ b/deps/v8/src/snapshot/startup-serializer.cc
@@ -71,7 +71,16 @@ bool IsUnexpectedCodeObject(Isolate* isolate, HeapObject obj) {
 #endif  // DEBUG
 
 void StartupSerializer::SerializeObject(HeapObject obj) {
-  DCHECK(!obj.IsJSFunction());
+#ifdef DEBUG
+  if (obj.IsJSFunction()) {
+    v8::base::OS::PrintError("Reference stack:\n");
+    PrintStack(std::cerr);
+    obj.Print(std::cerr);
+    FATAL(
+        "JSFunction should be added through the context snapshot instead of "
+        "the isolate snapshot");
+  }
+#endif  // DEBUG
   DCHECK(!IsUnexpectedCodeObject(isolate(), obj));
 
   if (SerializeHotObject(obj)) return;