diff --git a/package.json b/package.json
index bf42975..6ee4327 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "babel-preset-react": "6.16.0",
     "babel-preset-stage-2": "6.17.0",
     "babel-register": "6.18.0",
-    "chai": "3.5.0",
+    "chai": "4.0.2",
     "chai-as-promised": "6.0.0",
     "chai-http": "3.0.0",
     "coveralls": "2.11.14",