diff --git a/package.json b/package.json
index f75230d..aff8185 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
     "istanbul": "^0.4.4",
     "lodash.assign": "^4.1.0",
     "mocha": "^3.1.2",
-    "sinon": "^1.14.1"
+    "sinon": "^2.1.0"
   },
   "main": "index.js",
   "scripts": {