diff --git a/package.json b/package.json
index 4d2bb8042..1e16185de 100644
--- a/package.json
+++ b/package.json
@@ -39,6 +39,7 @@
     "karma-jasmine-html-reporter": "^0.1.8",
     "merge-stream": "^1.0.0",
     "vinyl-source-stream": "^1.1.0",
+    "watchify": "^3.7.0",
     "yargs": "^5.0.0"
   },
   "spm": {