diff --git a/package.json b/package.json
index e89efae..0d870d9 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "url": "https://github.com/microsoftgraph/msgraph-beta-typescript-typings.git"
   },
   "devDependencies": {
-    "@types/chai": "^3.4.35",
+    "@types/chai": "^4.3.4",
     "typescript": "^2.2.1",
     "chai": "^3.5.0",
     "mocha": "^3.2.0",