diff --git a/package.json b/package.json
index 1f2bac7..43ca2c6 100644
--- a/package.json
+++ b/package.json
@@ -47,6 +47,7 @@
     "husky": "^0.13.4",
     "release-it": "^2.7.3",
     "rimraf": "^2.5.4",
+    "sinon": "^2.3.4",
     "webpack": "^2.2.1"
   },
   "dependencies": {