diff --git a/package.json b/package.json
index 9e0a60b..c27d2b3 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "require"
   ],
   "dependencies": {
-    "pegjs": "^0.8.0"
+    "pegjs": "^0.9.0"
   },
   "devDependencies": {
     "chai": "^1.9.2",