diff --git a/package.json b/package.json
index 4c7ec4ae9a5409581f0b3114e559b6d83b11022f..2034d9df9e973ddd44cb79a42bf1a18665e9e732 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
   "devDependencies": {
     "bower": "1.3.8",
     "chai": "1.10.0",
+    "es6-promise": "1.0.0",
     "jshint": "2.5.2",
     "mocha-phantomjs": "3.5.2",
     "mocha": "2.1.0",