diff --git a/yarn.lock b/yarn.lock
index bb9e878..005545b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -254,13 +254,9 @@ acorn-jsx@^4.1.1:
   dependencies:
     acorn "^5.0.3"
 
-acorn@^5.0.0:
-  version "5.1.2"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.1.2.tgz#911cb53e036807cf0fa778dc5d370fbd864246d7"
-
-acorn@^5.0.3, acorn@^5.3.0, acorn@^5.6.0, acorn@^5.6.2:
-  version "5.7.1"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.1.tgz#f095829297706a7c9776958c0afc8930a9b9d9d8"
+acorn@^5.0.0, acorn@^5.0.3, acorn@^5.3.0, acorn@^5.6.0, acorn@^5.6.2:
+  version "5.7.4"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.4.tgz#3e8d8a9947d0599a1796d10225d7432f4a4acf5e"
 
 ajv-keywords@^3.0.0, ajv-keywords@^3.1.0:
   version "3.2.0"