diff --git a/package.json b/package.json
index 36b76db..34564bb 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,8 @@
   "author": "istex-rd",
   "license": "ISC",
   "dependencies": {
-    "async": "^2.1.4"
+    "async": "^2.1.4",
+    "chai": "^3.5.0",
+    "mocha": "^3.2.0"
   }
 }