diff --git a/package.json b/package.json
index 36d0bee..efb7893 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "babel-preset-es2015": "^6.5.0",
     "babel-preset-react": "^6.5.0",
     "babel-preset-stage-0": "^6.5.0",
-    "chai": "^3.5.0",
+    "chai": "^4.3.4",
     "eslint": "^2.2.0",
     "eslint-config-airbnb": "6.0.1",
     "eslint-plugin-react": "^4.0.0",