diff --git a/package.json b/package.json
index 3c6b3da..0d48a45 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "uglify-js": "^2.4.24"
   },
   "devDependencies": {
-    "bluebird": "2",
+    "bluebird": "3.1.1",
     "istanbul": "0",
     "mocha": "2",
     "rimraf": "^2.2.8"