diff --git a/package.json b/package.json
index bb63f64..d88d44b 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "request": "^2.81.0",
     "request-promise": "^4.2.1",
     "test-listen": "^1.0.2",
-    "xo": "^0.20.2"
+    "xo": "^0.21.0"
   },
   "now": {
     "alias": "bigchaindb-meetups.now.sh",