diff --git a/package.json b/package.json
index 85968ce..901c220 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   },
   "devDependencies": {
     "ava": "3.15.0",
-    "xo": "0.37.1"
+    "xo": "0.40.2"
   },
   "xo": {
     "space": 2,