diff --git a/package.json b/package.json
index c8bca8c7fd..8c9d007526 100644
--- a/package.json
+++ b/package.json
@@ -59,6 +59,7 @@
     "browserify": "6.1.0",
     "proclaim": "2.0.0",
     "rimraf": "2.2.8",
-    "jshint": "2.5.6"
+    "jshint": "2.5.6",
+    "chai": "^1.9.2"
   }
 }