diff --git a/package.json b/package.json
--- a/package.json
+++ b/package.json
@@ -11,9 +11,10 @@
   "dependencies": {
     "@webcomponents/shadycss": "^1.1.3",
     "@webcomponents/webcomponentsjs": "^1.2.0",
-    "bower": "^1.8.0",
+    "bower": "^1.8.4",
     "browserify": "^16.2.0",
     "chai": "^3.5.0",
+    "coffeescript": "^2.3.0",
     "d3": "^5.1.0",
     "mocha": "^2.5.3",
     "n3": "^1.0.0-alpha",