diff --git a/package.json b/package.json
index e9950a7..9b6dc14 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "when": "^3.7.7"
   },
   "devDependencies": {
-    "ava": "^0.20.0",
+    "ava": "^0.21.0",
     "coveralls": "^2.13.1",
     "nyc": "^11.0.3",
     "source-loader": "^0.2.0",