diff --git a/package.json b/package.json
index 587b1b5..7dfa5d3 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "grunt-cli": "^1.2.0",
     "grunt-contrib-clean": "^1.0.0",
     "grunt-contrib-nodeunit": "^1.0.0",
-    "xo": "*"
+    "xo": "^0.16.0"
   },
   "peerDependencies": {
     "grunt": ">=0.4.0"