diff --git a/package.json b/package.json
index a8d1f08..ee9cf7c 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "istanbul": "^0.4.5",
     "jsdoc": "^3.4.3",
     "mocha": "^5.0.0",
-    "sinon": "^5.0.0",
+    "sinon": "^9.0.2",
     "webpack": "^4.0.0"
   }
 }