diff --git a/package.json b/package.json
index a1c8483..fab1b65 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "babelify": "^7.2.0",
     "browser-sync": "^2.8.2",
     "browserify": "^14.1.0",
-    "chai": "^3.5.0",
+    "chai": "^4.0.0",
     "enzyme": "^2.1.0",
     "eslint": "~3.19.0",
     "eslint-plugin-react": "^6.0.0",