diff --git a/package.json b/package.json
index 9d62def..6542ef7 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "delete"
   ],
   "devDependencies": {
-    "mocha": "*",
+    "mocha": "^3.5.3",
     "xo": "^0.17.1"
   },
   "xo": {