diff --git a/package.json b/package.json
index 352a378..9a74e22 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "estraverse": "^1.9.0",
     "esutils": "^1.1.6",
     "esprima": "^1.2.2",
-    "optionator": "^0.4.0"
+    "optionator": "^0.5.0"
   },
   "optionalDependencies": {
     "source-map": "~0.1.40"