diff --git a/package.json b/package.json
index 7270e61..392988f 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "mocha": "^3.4.2",
     "mock-require": "^2.0.2",
     "nyc": "^11.0.2",
-    "sinon": "^3.0.0"
+    "sinon": "^4.0.0"
   },
   "eslintConfig": {
     "extends": [