diff --git a/package.json b/package.json
index 39d3455..8879908 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "test": "node test.js"
   },
   "devDependencies": {
-    "mocha": "",
+    "mocha": "2.3.3",
     "chai": "",
     "sinon": "",
     "sinon-chai": "",