diff --git a/package.json b/package.json
index 158439d..579320a 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
     "ioredis": "^2.4.2",
     "istanbul": "^0.4.5",
     "mocha": "^3.2.0",
-    "sinon": "^1.17.6"
+    "sinon": "^2.3.2"
   },
   "peerDependencies": {
     "express": "^4.14.0"