Fix serializer error handling, update ProtoBuf.js dependency
diff --git a/package.json b/package.json
index 440db2f..7f24232 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "lodash": "^4.15.0",
     "nan": "^2.0.0",
     "node-pre-gyp": "^0.6.0",
-    "protobufjs": "^6.0.0",
+    "protobufjs": "^6.7.0",
     "cares": "^1.1.5"
   },
   "devDependencies": {