diff --git a/package.json b/package.json
index bbc91e1..d07f229 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "stream-to-array": "2"
   },
   "devDependencies": {
-    "bluebird": "2",
+    "bluebird": "3.1.5",
     "mocha": "2",
     "mongodb": "2",
     "istanbul": "0"