diff --git a/package.json b/package.json
index 461c5f88..89e1c971 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,7 @@
     "del": "^2.2.1",
     "dom5": "^1.3.1",
     "eslint-plugin-html": "^1.3.0",
+    "google-closure-compiler": "^20161201.0.0",
     "gulp": "^3.9.1",
     "gulp-audit": "^1.0.0",
     "gulp-babel": "^6.1.2",
@@ -27,7 +28,7 @@
     "lazypipe": "^1.0.1",
     "merge-stream": "^1.0.0",
     "polyclean": "^1.2.0",
-    "polymer-build": "^0.3.0",
+    "polymer-build": "^0.6.0",
     "run-sequence": "^1.1.0",
     "through2": "^2.0.0",
     "web-component-tester": "^4"