diff --git a/yarn.lock b/yarn.lock
index 4ed3b83..60bb048 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1559,14 +1559,10 @@ acorn-walk@^6.0.1:
   resolved "https://registry.yarnpkg.com/acorn-walk/-/acorn-walk-6.1.1.tgz#d363b66f5fac5f018ff9c3a1e7b6f8e310cc3913"
 
 acorn@^5.5.3:
-  version "5.7.3"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.3.tgz#67aa231bf8812974b85235a96771eb6bd07ea279"
+  version "5.7.4"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.4.tgz#3e8d8a9947d0599a1796d10225d7432f4a4acf5e"
 
-acorn@^6.0.1, acorn@^6.0.4:
-  version "6.0.5"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.0.5.tgz#81730c0815f3f3b34d8efa95cb7430965f4d887a"
-
-acorn@^6.0.5, acorn@^6.0.7:
+acorn@^6.0.1, acorn@^6.0.4, acorn@^6.0.5, acorn@^6.0.7:
   version "6.1.1"
   resolved "https://registry.npm.taobao.org/acorn/download/acorn-6.1.1.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Facorn%2Fdownload%2Facorn-6.1.1.tgz#7d25ae05bb8ad1f9b699108e1094ecd7884adc1f"