diff --git a/package.json b/package.json
index 95b4a26..b8ccbd8 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "babel-plugin-transform-async-to-generator": "^6.22.0",
     "request": "^2.81.0",
     "request-promise": "^4.1.1",
-    "xo": "^0.18.1"
+    "xo": "^0.21.1"
   },
   "repository": {
     "type": "git",