diff --git a/package.json b/package.json
index 0eefa03..6a1bc4a 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "istanbul": "0.4.2",
     "mocha": "2.3.4",
     "sinon": "1.17.2",
-    "unexpected": "10.36.2",
+    "unexpected": "13.2.1",
     "unexpected-check": "1.11.0",
     "unexpected-sinon": "10.0.0"
   }