diff --git a/package.json b/package.json
index a3bac7e..951d768 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "test": "node test/run.js"
   },
   "dependencies": {
-    "acorn": "^3.1.0"
+    "acorn": "^7.1.1"
   },
   "devDependencies": {
     "chai": "^3.0.0",