diff --git a/package.json b/package.json
index 59804c2..9de6fbb 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "mocha": "~3.4.1",
     "nock": "~9.0.6",
     "power-assert": "~1.4.2",
-    "sinon": "~2.3.0"
+    "sinon": "~4.0.1"
   },
   "directories": {
     "test": "test/"