diff --git a/demo/yarn.lock b/demo/yarn.lock
index 9ef74cfb..890b266c 100644
--- a/demo/yarn.lock
+++ b/demo/yarn.lock
@@ -525,9 +525,9 @@ acorn-walk@^7.0.0:
   integrity sha512-wdlPY2tm/9XBr7QkKlq0WQVgiuGTX6YWPyRyBviSoScBuLfTVQhvwg6wJ369GJ/1nPfTLMfnrFIfjqVg6d+jQQ==
 
 acorn@^6.0.7, acorn@^6.2.1:
-  version "6.4.0"
-  resolved "https://registry.npm.taobao.org/acorn/download/acorn-6.4.0.tgz#b659d2ffbafa24baf5db1cdbb2c94a983ecd2784"
-  integrity sha1-tlnS/7r6JLr12xzbsslKmD7NJ4Q=
+  version "6.4.1"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.4.1.tgz#531e58ba3f51b9dacb9a6646ca4debf5b14ca474"
+  integrity sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==
 
 acorn@^7.1.0:
   version "7.1.0"
@@ -7341,7 +7341,7 @@ vue@^2.6.11:
   integrity sha512-VfPwgcGABbGAue9+sfrD4PuwFar7gPb1yl1UK1MwXoQPAw0BKSqWfoYCT/ThFrdEVWoI51dBuyCoiNU9bZDZxQ==
 
 vuetify-draggable-treeview@../:
-  version "0.0.3"
+  version "0.0.4"
 
 vuetify-loader@^1.3.0:
   version "1.4.3"