diff --git a/common.gypi b/common.gypi
index b5df26fd2be34f..c63b03399db4b6 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.19',
+    'v8_embedder_string': '-node.20',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/tools/gen-postmortem-metadata.py b/deps/v8/tools/gen-postmortem-metadata.py
index 717f26941a48ef..98ab941a415197 100644
--- a/deps/v8/tools/gen-postmortem-metadata.py
+++ b/deps/v8/tools/gen-postmortem-metadata.py
@@ -49,6 +49,7 @@
 # for py2/py3 compatibility
 from __future__ import print_function
 
+import io
 import re
 import sys
 
@@ -385,7 +386,7 @@ def load_objects():
 
 
 def load_objects_from_file(objfilename, checktypes):
-        objfile = open(objfilename, 'r');
+        objfile = io.open(objfilename, 'r', encoding='utf-8');
         in_insttype = False;
         in_torque_insttype = False
 
@@ -594,7 +595,7 @@ def load_fields():
 
 
 def load_fields_from_file(filename):
-        inlfile = open(filename, 'r');
+        inlfile = io.open(filename, 'r', encoding='utf-8');
 
         #
         # Each class's fields and the corresponding offsets are described in the