diff --git a/yarn.lock b/yarn.lock
index 69e976f..d80b5b2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -822,13 +822,9 @@ acorn-globals@^4.1.0:
   dependencies:
     acorn "^5.0.0"
 
-acorn@^5.0.0, acorn@^5.2.1, acorn@^5.5.3:
-  version "5.7.1"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.1.tgz#f095829297706a7c9776958c0afc8930a9b9d9d8"
-
-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@^5.2.1, 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:
   version "6.0.2"