diff --git a/package.json b/package.json
index e669c85..43e7eec 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "gulp-istanbul": "^0.10.2",
     "gulp-mocha": "^2.1.3",
     "rimraf": "^2.4.3",
-    "should": "^8.0.1"
+    "should": "^9.0.2"
   },
   "dependencies": {
     "linear-presets-amount-of-substance": "^1.0.0",