diff --git a/package-lock.json b/package-lock.json
index 74a21de..9235718 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "vue-draggable-nested-tree",
-  "version": "2.2.17",
+  "version": "2.2.20",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -3730,9 +3730,9 @@
       "dev": true
     },
     "css-what": {
-      "version": "2.1.2",
-      "resolved": "http://registry.npm.taobao.org/css-what/download/css-what-2.1.2.tgz",
-      "integrity": "sha1-wIdtnQSAkn19SSDc1yrzWVZJVU0=",
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/css-what/-/css-what-2.1.3.tgz",
+      "integrity": "sha512-a+EPoD+uZiNfh+5fxw2nO9QwFa6nJe2Or35fGY6Ipw1R3R4AGz1d1TEZrCegvw2YTmZ0jXirGYlzxxpYSHwpEg==",
       "dev": true
     },
     "cssesc": {