diff --git a/yarn.lock b/yarn.lock
index 540332563f..f19e701613 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -58,10 +58,14 @@ acorn@^3.0.4:
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-3.3.0.tgz#45e37fb39e8da3f25baee3ff5369e2bb5f22017a"
 
-acorn@^5.0.0, acorn@^5.0.3, acorn@^5.2.1, acorn@^5.3.0, acorn@^5.4.1, acorn@^5.5.0:
+acorn@^5.0.0, acorn@^5.0.3, acorn@^5.2.1, acorn@^5.3.0, acorn@^5.5.0:
   version "5.5.3"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.5.3.tgz#f473dd47e0277a08e28e9bec5aeeb04751f0b8c9"
 
+acorn@^5.4.1:
+  version "5.7.1"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.1.tgz#f095829297706a7c9776958c0afc8930a9b9d9d8"
+
 ajv-keywords@^2.1.0:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/ajv-keywords/-/ajv-keywords-2.1.1.tgz#617997fc5f60576894c435f940d819e135b80762"