diff --git a/common.gypi b/common.gypi
index 34c805af9f2c71..d39668b100d33c 100644
--- a/common.gypi
+++ b/common.gypi
@@ -35,7 +35,7 @@
 
     # 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.11',
+    'v8_embedder_string': '-node.12',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/tools/gen-postmortem-metadata.py b/deps/v8/tools/gen-postmortem-metadata.py
index 4f9e142054f0d3..1fddfcf83d6b7e 100644
--- a/deps/v8/tools/gen-postmortem-metadata.py
+++ b/deps/v8/tools/gen-postmortem-metadata.py
@@ -280,7 +280,6 @@
     'SlicedString, offset, SMI, kOffsetOffset',
     'ThinString, actual, String, kActualOffset',
     'Symbol, name, Object, kDescriptionOffset',
-    'Map, constructor_or_backpointer, Object, kConstructorOrBackPointerOrNativeContextOffset',
 ];
 
 #