diff --git a/package.json b/package.json
index f72f25d..373a8ac 100644
--- a/package.json
+++ b/package.json
@@ -33,6 +33,6 @@
     "proxyquire": "^1.7.10",
     "serialport": "^4.0.1",
     "should": "^13.2.0",
-    "sinon": "^2.3.2"
+    "sinon": "^4.4.1"
   }
 }