diff --git a/demo/ast/package-lock.json b/demo/ast/package-lock.json
index 2f71f14..83c2a3e 100644
--- a/demo/ast/package-lock.json
+++ b/demo/ast/package-lock.json
@@ -338,9 +338,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.20",
-      "resolved": "https://registry.npm.taobao.org/lodash/download/lodash-4.17.20.tgz",
-      "integrity": "sha1-tEqbYpe8tpjxxRo1RaKzs2jVnFI=",
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
       "dev": true
     },
     "minimist": {