diff --git a/learning-webrtc/ch4/package.json b/learning-webrtc/ch4/package.json
index 5b1d9c8..3c0bb1f 100644
--- a/learning-webrtc/ch4/package.json
+++ b/learning-webrtc/ch4/package.json
@@ -9,6 +9,6 @@
   "author": "Dan Ristic",
   "license": "MIT",
   "dependencies": {
-    "ws": "~0.4.31"
+    "ws": "~7.2.0"
   }
 }