diff --git a/chapter4/node-serial-benchmark/package-lock.json b/chapter4/node-serial-benchmark/package-lock.json
index 5a04235..983b782 100644
--- a/chapter4/node-serial-benchmark/package-lock.json
+++ b/chapter4/node-serial-benchmark/package-lock.json
@@ -926,9 +926,9 @@
       "integrity": "sha1-u3J3n1+kZRhrH0OPZ0+jR/2121Q="
     },
     "y18n": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npm.taobao.org/y18n/download/y18n-3.2.1.tgz",
-      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE="
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.2.tgz",
+      "integrity": "sha512-uGZHXkHnhF0XeeAPgnKfPv1bgKAYyVvmNL1xlKsPYZPaIHxGti2hHqvOCQv71XMsLxu1QjergkqogUnms5D3YQ=="
     },
     "yargs": {
       "version": "3.32.0",