diff --git a/package.json b/package.json
index a47115f007..0dc9dd3597 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
   "dependencies": {
     "msgpack-js": "https://github.com/ably-forks/msgpack-js.git",
     "request": "^2.83.0",
-    "ws": "~4.0"
+    "ws": "^5.1"
   },
   "devDependencies": {
     "async": "git://github.com/ably-forks/async.git#requirejs",