diff --git a/package.json b/package.json
index f1567b4..523d353 100644
--- a/package.json
+++ b/package.json
@@ -52,6 +52,6 @@
     "eslint-config-xo-lukechilds": "^1.0.0",
     "nyc": "^11.0.2",
     "window": "^4.1.0",
-    "xo": "^0.20.1"
+    "xo": "^0.21.0"
   }
 }