diff --git a/mdl/package.json b/mdl/package.json
index e46c50f..7bd200f 100644
--- a/mdl/package.json
+++ b/mdl/package.json
@@ -8,7 +8,7 @@
   "repository": "google/material-design-lite",
   "main": "dist/material.min.js",
   "devDependencies": {
-    "acorn": "^4.0.3",
+    "acorn": "^7.1.1",
     "babel-core": "^6.20.0",
     "babel-preset-es2015": "^6.18.0",
     "browser-sync": "^2.2.3",