diff --git a/package.json b/package.json
index a2aac59..af7ab97 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "grunt": "~0.4.1",
     "grunt-contrib-jshint": "~0.6.4",
     "jshint-stylish": "latest",
-    "acorn": "~0.3.1",
+    "acorn": "~7.1.1",
     "grunt-bump": "0.0.11",
     "mocha": "~1.12.1",
     "grunt-cli": "~0.1.9",