diff --git a/package.json b/package.json
index bf86c09..133c7b0 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
   },
   "devDependencies": {
     "babel-eslint": "4.1.3",
-    "escope": "^3.3.0",
+    "escope": "3.3.0",
     "eslint": "1.5.1",
     "eslint-plugin-mocha": "1.0.0",
     "precommit-hook": "^3.0.0"