diff --git a/package.json b/package.json
index b2b0ec7..e05d1d8 100644
--- a/package.json
+++ b/package.json
@@ -49,6 +49,6 @@
     "iced-coffee-script": "^108.0.11",
     "istanbul": "^0.4.4",
     "mocha": "^3.0.2",
-    "sinon": "^3.2.1"
+    "sinon": "^4.0.0"
   }
 }