diff --git a/package.json b/package.json
index 84e79f2..c063b06 100644
--- a/package.json
+++ b/package.json
@@ -65,7 +65,7 @@
     "babel-preset-es2015": "^6.22.0",
     "babel-preset-react": "^6.23.0",
     "babel-preset-stage-1": "^6.22.0",
-    "chai": "^3.5.0",
+    "chai": "^4.1.0",
     "chai-enzyme": "^0.6.1",
     "enzyme": "^2.7.1",
     "eslint": "^3.11.0",