diff --git a/package.json b/package.json
index a972a09..dd9b8aa 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,7 @@
     "fs-plus": "2.x",
     "atom-space-pen-views": "^2.0.3",
     "pathwatcher": "^4.2",
+    "underscore-plus": "^1.6.6",
     "temp": "~0.7.0"
   }
 }