diff --git a/package.json b/package.json
index 4a5cfd1..0fbf128 100644
--- a/package.json
+++ b/package.json
@@ -64,6 +64,6 @@
     "mocha": "^3.1.2",
     "nyc": "^10.0.0",
     "proxyquire": "^1.7.1",
-    "sinon": "^1.16.1"
+    "sinon": "^2.1.0"
   }
 }