diff --git a/yarn.lock b/yarn.lock
index 9613256..e52d4ca 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1199,8 +1199,8 @@ expect@^21.0.2:
     jest-regex-util "^21.0.2"
 
 extend@^3.0.0, extend@~3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/extend/-/extend-3.0.0.tgz#5a474353b9f3353ddd8176dfd37b91c83a46f1d4"
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/extend/-/extend-3.0.2.tgz#f8b1136b4071fbd8eb140aff858b1019ec2915fa"
 
 external-editor@^1.1.0:
   version "1.1.1"
@@ -2999,7 +2999,7 @@ preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
 
-prettier@^1.5.3, prettier@^1.6.1:
+prettier@^1.5.3:
   version "1.6.1"
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.6.1.tgz#850f411a3116226193e32ea5acfc21c0f9a76d7d"