diff --git a/package.json b/package.json
index c6428fe..6b32cdb 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   "devDependencies": {
     "koop": "2.12.1",
     "nock": "~9.1.1",
-    "sinon": "^2.0.0",
+    "sinon": "^4.3.0",
     "standard": "^9.0.1",
     "supertest": "~3.0.0",
     "tap-spec": "^4.1.1",