diff --git a/package.json b/package.json
index a4daa93..701d2bb 100644
--- a/package.json
+++ b/package.json
@@ -56,6 +56,6 @@
     "istanbul": "^0.4.5",
     "mock-firmata": "0.2.0",
     "nodeunit": "^0.11.0",
-    "sinon": "^3.0.0"
+    "sinon": "^4.4.5"
   }
 }