diff --git a/package.json b/package.json
index 0aee85d..f4ae9d4 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "coveralls": "^3.0.4",
     "mocha": "^4.1.0",
     "nyc": "^15.0.0",
-    "sinon": "^8.0.1",
+    "sinon": "^9.0.0",
     "snazzy": "^8.0.0",
     "standard": "^14.3.1"
   }