diff --git a/package.json b/package.json
index c5a8d3b..19a0bad 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,8 @@
   "main": "urn.js",
   "dependencies": {
     "semver": "2.1.0",
-    "mkdirp": "0.3.5"
+    "mkdirp": "0.3.5",
+    "shelljs": "0.3.0"
   },
   "devDependencies": {},
   "scripts": {
@@ -31,4 +32,4 @@
   "bugs": {
     "url": "https://github.com/dtrejo/urn/issues"
   }
-}
+}
\ No newline at end of file