diff --git a/package.json b/package.json
index a1a5164..8c5cfb1 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "istanbul": "^0.4.2",
     "lodash": "^4.6.1",
     "mocha": "^4.0.0",
-    "should": "^11.2.1"
+    "should": "^13.2.1"
   },
   "files": [
     "index.js",