diff --git a/package.json b/package.json
index 061f3c3d8b..4c8552518f 100644
--- a/package.json
+++ b/package.json
@@ -83,7 +83,7 @@
     "pixelmatch": "^4.0.2",
     "proj4": "2.4.4",
     "serve-files": "1.0.1",
-    "sinon": "3.3.0",
+    "sinon": "4.0.0",
     "slimerjs": "0.10.3",
     "url-polyfill": "^1.0.7"
   },