diff --git a/deps/v8z/include/v8-version.h b/deps/v8z/include/v8-version.h
index cfd3fdb73a6e..6cd4ac3b448c 100644
--- a/deps/v8z/include/v8-version.h
+++ b/deps/v8z/include/v8-version.h
@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 4
 #define V8_MINOR_VERSION 5
 #define V8_BUILD_NUMBER 103
-#define V8_PATCH_LEVEL 39
+#define V8_PATCH_LEVEL 40
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
diff --git a/deps/v8z/src/objects.cc b/deps/v8z/src/objects.cc
index 5cc43e35990a..d16c8e408c30 100644
--- a/deps/v8z/src/objects.cc
+++ b/deps/v8z/src/objects.cc
@@ -15213,6 +15213,19 @@ Handle<ObjectHashTable> ObjectHashTable::Put(Handle<ObjectHashTable> table,
   if ((table->NumberOfDeletedElements() << 1) > table->NumberOfElements()) {
     table->Rehash(isolate->factory()->undefined_value());
   }
+  // If we're out of luck, we didn't get a GC recently, and so rehashing
+  // isn't enough to avoid a crash.
+  int nof = table->NumberOfElements() + 1;
+  if (!table->HasSufficientCapacity(nof)) {
+    int capacity = ObjectHashTable::ComputeCapacity(nof * 2);
+    if (capacity > ObjectHashTable::kMaxCapacity) {
+      for (size_t i = 0; i < 2; ++i) {
+        isolate->heap()->CollectAllGarbage(
+            Heap::kFinalizeIncrementalMarkingMask, "full object hash table");
+      }
+      table->Rehash(isolate->factory()->undefined_value());
+    }
+  }
 
   // Check whether the hash table should be extended.
   table = EnsureCapacity(table, 1, key);