diff --git a/package.json b/package.json
index 5170189..0b50188 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "istanbul": "~0.4.5",
     "pre-commit": "~1.2.0",
     "mocha": "~3.1.2",
-    "sinon": "~1.17.6",
+    "sinon": "~2.0.0-pre.6",
     "sinon-chai": "~2.8.0",
     "chai": "~3.5.0",
     "request": "~2.79.0"