diff --git a/package.json b/package.json
index af6283a..001e5b9 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
   },
   "homepage": "https://github.com/gbranchaud/yose-node",
   "devDependencies": {
-    "chai": "^3.2.0",
+    "chai": "^4.0.0",
     "cheerio": "^0.20.0",
     "mocha": "^2.5.0",
     "supertest": "^1.1.0"