diff --git a/package.json b/package.json
index d517c01..c1fbb59 100644
--- a/package.json
+++ b/package.json
@@ -129,7 +129,7 @@
     "rollup-plugin-filesize": "1.0.1",
     "rollup-watch": "3.2.2",
     "semver": "5.3.0",
-    "sinon": "1.17.7",
+    "sinon": "2.0.0-pre.6",
     "sinon-chai": "2.8.0",
     "webpack": "1.14.0"
   }