diff --git a/package.json b/package.json
index 38a42c4..30ae564 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,8 @@
     "description": "Yet Another Plugin Server",
     "devDependencies": {
         "jscoverage": "~0.3.8",
-        "mocha": "~1.12.1"
+        "mocha": "~1.12.1",
+        "sinon": "~1.7.3"
     },
     "keywords": [
         "http",