diff --git a/yarn.lock b/yarn.lock
index 58ed7bb..8085f4a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1180,13 +1180,9 @@ acorn-walk@^6.0.1:
   version "6.2.0"
   resolved "https://registry.yarnpkg.com/acorn-walk/-/acorn-walk-6.2.0.tgz#123cb8f3b84c2171f1f7fb252615b1c78a6b1a8c"
 
-acorn@^5.0.0:
-  version "5.0.3"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.0.3.tgz#c460df08491463f028ccb82eab3730bf01087b3d"
-
-acorn@^5.5.3, acorn@^5.6.2:
-  version "5.7.3"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.3.tgz#67aa231bf8812974b85235a96771eb6bd07ea279"
+acorn@^5.0.0, acorn@^5.5.3, acorn@^5.6.2:
+  version "5.7.4"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.4.tgz#3e8d8a9947d0599a1796d10225d7432f4a4acf5e"
 
 acorn@^6.0.1, acorn@^6.0.7:
   version "6.2.1"