diff --git a/package.json b/package.json
index c683423029..abb6f54d77 100644
--- a/package.json
+++ b/package.json
@@ -63,7 +63,7 @@
 		"@types/webpack": "2.2.15",
 		"@types/webpack-stream": "3.2.7",
 		"@types/websocket": "0.0.33",
-		"chai": "3.5.0",
+		"chai": "4.0.2",
 		"chai-http": "3.0.0",
 		"css-loader": "0.28.4",
 		"event-stream": "3.3.4",