diff --git a/package.json b/package.json
index 370776c..885b648 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "blue-tape": "^1.0.0",
     "mocha": "^3.3.0",
     "onchange": "^3.2.1",
-    "should": "^11.2.1",
+    "should": "^13.1.1",
     "tap-spec": "^4.1.1",
     "ts-node": "^3.0.3",
     "tslint": "^5.2.0",