diff --git a/package.json b/package.json
index 4c5c5c8..4af7d10 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "gulp-istanbul": "^0.10.2",
     "gulp-mocha": "^2.1.3",
     "rimraf": "^2.4.3",
-    "should": "^8.0.1"
+    "should": "^9.0.0"
   },
   "dependencies": {
     "big.js": "^3.1.3",