diff --git a/package.json b/package.json
index 519a1ebe..f402be53 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "node": ">= 1.0.0"
   },
   "dependencies": {
-    "acorn": "^5.0.3",
+    "acorn": "^6.1.1",
     "escodegen": "^1.8.1",
     "estraverse": "^4.2.0",
     "html-minifier": "^3.4.3",