diff --git a/yarn.lock b/yarn.lock
index 5798477..bb5434d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -63,8 +63,8 @@ es6-promise@3.2.1:
   resolved "http://registry.npm.taobao.org/es6-promise/download/es6-promise-3.2.1.tgz#ec56233868032909207170c39448e24449dd1fc4"
 
 extend@^3.0.0:
-  version "3.0.1"
-  resolved "http://registry.npm.taobao.org/extend/download/extend-3.0.1.tgz#a755ea7bc1adfcc5a31ce7e762dbaadc5e636444"
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/extend/-/extend-3.0.2.tgz#f8b1136b4071fbd8eb140aff858b1019ec2915fa"
 
 form-data@^2.3.1:
   version "2.3.1"