diff --git a/package.json b/package.json
index b0edba6..9a6c869 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
   },
   "dependencies": {},
   "devDependencies": {
-    "chai": "^3.5.0",
+    "chai": "^4.1.0",
     "eslint": "^3.12.2",
     "eslint-config-fullstack": "^3.0.0",
     "eslint-plugin-react": "^7.0.0",