diff --git a/package.json b/package.json
index a2becd3376..684bfd2163 100644
--- a/package.json
+++ b/package.json
@@ -76,7 +76,7 @@
     "proj4": "2.4.4",
     "recast": "0.14.7",
     "serve": "^6.5.2",
-    "sinon": "5.0.0",
+    "sinon": "^4.5.0",
     "url-polyfill": "^1.0.11",
     "walk": "^2.3.9",
     "webpack": "3.11.0",