diff --git a/package.json b/package.json
index 6bea11b..38af8b4 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,6 @@
     "coveralls": "^2.11.12",
     "istanbul": "^0.4.4",
     "mocha": "^3.0.2",
-    "sinon": "^1.17.5"
+    "sinon": "^2.3.1"
   }
 }