diff --git a/ts_in_action_0831/package-lock.json b/ts_in_action_0831/package-lock.json
index bb2b657..e982aa6 100644
--- a/ts_in_action_0831/package-lock.json
+++ b/ts_in_action_0831/package-lock.json
@@ -1509,9 +1509,9 @@
       "dev": true
     },
     "elliptic": {
-      "version": "6.5.0",
-      "resolved": "https://registry.npm.taobao.org/elliptic/download/elliptic-6.5.0.tgz?cache=0&sync_timestamp=1561521858170&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Felliptic%2Fdownload%2Felliptic-6.5.0.tgz",
-      "integrity": "sha1-K47UyJG33jIA4UQSpbgkjHr1Bco=",
+      "version": "6.5.3",
+      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.3.tgz",
+      "integrity": "sha512-IMqzv5wNQf+E6aHeIqATs0tOLeOTwj1QKbRcS3jBbYkl5oLAserA8yJTT7/VyHUYG91PRmPyeQDObKLPpeS4dw==",
       "dev": true,
       "requires": {
         "bn.js": "^4.4.0",