diff --git a/package.json b/package.json
index 9b166f0..b79fb28 100644
--- a/package.json
+++ b/package.json
@@ -20,5 +20,8 @@
     "dependencies" : {
         "tar"  : "0.1.17",
         "iconv-lite" : "0.2.10"
+    },
+    "devDependencies": {
+        "chai": "^1.9.1"
     }
 }