diff --git a/yarn.lock b/yarn.lock
index 7f9449a..5a7f2b8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -144,8 +144,9 @@ acorn-globals@^4.0.0:
     acorn "^5.0.0"
 
 acorn@^5.0.0, acorn@^5.1.2:
-  version "5.2.1"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.2.1.tgz#317ac7821826c22c702d66189ab8359675f135d7"
+  version "5.7.4"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.4.tgz#3e8d8a9947d0599a1796d10225d7432f4a4acf5e"
+  integrity sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg==
 
 ajv@^4.9.1:
   version "4.11.8"