diff --git a/common.gypi b/common.gypi
index 39229ef58787..2967d1e63a48 100644
--- a/common.gypi
+++ b/common.gypi
@@ -44,7 +44,7 @@
 
     # 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.39',
+    'v8_embedder_string': '-node.40',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/src/objects/code.cc b/deps/v8/src/objects/code.cc
index ddc928254e83..a035b69aeb52 100644
--- a/deps/v8/src/objects/code.cc
+++ b/deps/v8/src/objects/code.cc
@@ -226,6 +226,10 @@ void Code::SetMarkedForDeoptimization(Isolate* isolate,
       } else {
         jdt.SetCodeNoWriteBarrier(handle, *BUILTIN_CODE(isolate, CompileLazy));
       }
+      // TODO(olivf, 525686865): Fix the race in dispatch handle marking by
+      // going back to a CAS loop.
+      static_assert(JSDispatchTable::kWriteBarrierSetsEntryMarkBit);
+      jdt.Mark(handle);
     }
     // Ensure we don't try to patch the entry multiple times.
     set_js_dispatch_handle(kNullJSDispatchHandle);