diff --git a/package.json b/package.json
index b74ca3b..e88936b 100644
--- a/package.json
+++ b/package.json
@@ -37,6 +37,7 @@
   },
   "devDependencies": {
     "chai": "^2.3.0",
+    "coffee-script": "^1.9.2",
     "hubot-mock-adapter": "^1.0.0"
   }
 }