diff --git a/package.json b/package.json
index c2a1caa..b34de4d 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
   "devDependencies": {
     "babel-core": "^5.6.15",
     "babel-loader": "^5.3.0",
-    "chai": "^3.2.0",
+    "chai": "^4.3.6",
     "eslint": "^1.0.0-rc-1",
     "karma": "^0.13.3",
     "karma-chai": "^0.1.0",