diff --git a/package.json b/package.json
index 6bd7a1c..13bfb77 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "chai": "3.5.0",
+    "chai": "4.3.7",
     "grunt": "0.4.5",
     "grunt-cli": "1.2.0",
     "grunt-contrib-jshint": "1.1.0",