diff --git a/package.json b/package.json
index 642081e..7c6fa21 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
   },
   "devDependencies": {
     "backbone.uniquemodel": "0.9.0",
-    "chai": "1.10.0",
+    "chai": "4.1.2",
     "chai-react": "3.0.1",
     "docco": "0.6.3",
     "es5-shim": "4.5.10",