diff --git a/package.json b/package.json
index f589906277..8987b917d0 100644
--- a/package.json
+++ b/package.json
@@ -93,6 +93,7 @@
     "grunt-mocha-cli": "2.1.0",
     "grunt-mocha-istanbul": "5.0.1",
     "grunt-shell": "1.3.0",
+    "grunt-subgrunt": "1.2.0",
     "grunt-update-submodules": "0.4.1",
     "istanbul": "0.4.3",
     "matchdep": "1.0.1",