diff --git a/yarn.lock b/yarn.lock
index 9e5b9eb..c36d1c7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -25,8 +25,8 @@ accepts@~1.3.4:
     negotiator "0.6.1"
 
 acorn@^6.1.1:
-  version "6.3.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.3.0.tgz#0087509119ffa4fc0a0041d1e93a417e68cb856e"
+  version "6.4.2"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.4.2.tgz#35866fd710528e92de10cf06016498e47e39e1e6"
 
 ajv@^4.9.1:
   version "4.11.8"