diff --git a/packages/engine.io-client/CHANGELOG.md b/packages/engine.io-client/CHANGELOG.md
index 2a090dcb1..3553b84b6 100644
--- a/packages/engine.io-client/CHANGELOG.md
+++ b/packages/engine.io-client/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 | Version                                                                                                     | Release date   | Bundle size (UMD min+gzip) |
 |-------------------------------------------------------------------------------------------------------------|----------------|----------------------------|
+| [6.6.3](#663-2025-01-23)                                                                                    | January 2025   | `8.7 KB`                   |
 | [6.6.2](#662-2024-10-23)                                                                                    | October 2024   | `8.7 KB`                   |
 | [6.6.1](#661-2024-09-21)                                                                                    | September 2024 | `8.7 KB`                   |
 | [6.6.0](#660-2024-06-21)                                                                                    | June 2024      | `8.6 KB`                   |
@@ -40,6 +41,20 @@
 
 # Release notes
 
+## [6.6.3](https://github.com/socketio/socket.io/compare/engine.io-client@6.6.2...engine.io-client@6.6.3) (2025-01-23)
+
+
+### Bug Fixes
+
+* correctly consume the `ws` package ([#5220](https://github.com/socketio/socket.io/issues/5220)) ([7fcddcb](https://github.com/socketio/socket.io/commit/7fcddcb3bbd236b46aa8fee6f4ce6c45afb7b03a))
+
+
+### Dependencies
+
+- [`ws@~8.17.1`](https://github.com/websockets/ws/releases/tag/8.17.1) (no change)
+
+
+
 ## [6.6.2](https://github.com/socketio/socket.io/compare/engine.io-client@6.6.1...engine.io-client@6.6.2) (2024-10-23)
 
 
diff --git a/packages/engine.io-client/dist/engine.io.esm.min.js b/packages/engine.io-client/dist/engine.io.esm.min.js
index a37741a87..4dc071a83 100644
--- a/packages/engine.io-client/dist/engine.io.esm.min.js
+++ b/packages/engine.io-client/dist/engine.io.esm.min.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v6.6.2
- * (c) 2014-2024 Guillermo Rauch
+ * Engine.IO v6.6.3
+ * (c) 2014-2025 Guillermo Rauch
  * Released under the MIT License.
  */
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this.onError("fetch read error",t.status,t);t.text().then((t=>this.onData(t)))})).catch((t=>{this.onError("fetch read error",t)}))}doWrite(t,s){this.et(t).then((t=>{if(!t.ok)return this.onError("fetch write error",t.status,t);s()})).catch((t=>{this.onError("fetch write error",t)}))}et(t){var s;const e=void 0!==t,i=new Headers(this.opts.extraHeaders);return e&&i.set("content-type","text/plain;charset=UTF-8"),null===(s=this.socket.W)||void 0===s||s.appendCookies(i),fetch(this.uri(),{method:e?"POST":"GET",body:e?t:null,headers:i,credentials:this.opts.withCredentials?"include":"omit"}).then((t=>{var s;return null===(s=this.socket.W)||void 0===s||s.parseCookies(t.headers.getSetCookie()),t}))}}const et=tt.protocol;export{st as Fetch,X as NodeWebSocket,$ as NodeXHR,tt as Socket,Z as SocketWithUpgrade,Y as SocketWithoutUpgrade,C as Transport,_ as TransportError,X as WebSocket,V as WebTransport,$ as XHR,O as installTimerFunctions,x as nextTick,J as parse,et as protocol,F as transports};
diff --git a/packages/engine.io-client/dist/engine.io.js b/packages/engine.io-client/dist/engine.io.js
index cb2100204..83d420513 100644
--- a/packages/engine.io-client/dist/engine.io.js
+++ b/packages/engine.io-client/dist/engine.io.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v6.6.2
- * (c) 2014-2024 Guillermo Rauch
+ * Engine.IO v6.6.3
+ * (c) 2014-2025 Guillermo Rauch
  * Released under the MIT License.
  */
 (function (global, factory) {
diff --git a/packages/engine.io-client/dist/engine.io.min.js b/packages/engine.io-client/dist/engine.io.min.js
index 76a48e1c6..782d498ee 100644
--- a/packages/engine.io-client/dist/engine.io.min.js
+++ b/packages/engine.io-client/dist/engine.io.min.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v6.6.2
- * (c) 2014-2024 Guillermo Rauch
+ * Engine.IO v6.6.3
+ * (c) 2014-2025 Guillermo Rauch
  * Released under the MIT License.
  */
 !function(t,n){"object"==typeof exports&&"undefined"!=typeof module?module.exports=n():"function"==typeof define&&define.amd?define(n):(t="undefined"!=typeof globalThis?globalThis:t||self).eio=n()}(this,(function(){"use strict";function t(t,n){for(var i=0;i<n.length;i++){var r=n[i];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(t,u(r.key),r)}}function n(n,i,r){return i&&t(n.prototype,i),r&&t(n,r),Object.defineProperty(n,"prototype",{writable:!1}),n}function i(){return i=Object.assign?Object.assign.bind():function(t){for(var n=1;n<arguments.length;n++){var i=arguments[n];for(var r in i)({}).hasOwnProperty.call(i,r)&&(t[r]=i[r])}return t},i.apply(null,arguments)}function r(t){return r=Object.setPrototypeOf?Object.getPrototypeOf.bind():function(t){return t.__proto__||Object.getPrototypeOf(t)},r(t)}function e(t,n){t.prototype=Object.create(n.prototype),t.prototype.constructor=t,s(t,n)}function o(){try{var 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0!==arguments[1]?arguments[1]:{},r="object"===f(n)?n:i;return(!r.transports||r.transports&&"string"==typeof r.transports[0])&&(r.transports=(r.transports||["polling","websocket","webtransport"]).map((function(t){return et[t]})).filter((function(t){return!!t}))),t.call(this,n,r)||this}return e(n,t),n}(at);return function(t,n){return new pt(t,n)}}));
diff --git a/packages/engine.io-client/package.json b/packages/engine.io-client/package.json
index 95c5f2bba..6cad94074 100644
--- a/packages/engine.io-client/package.json
+++ b/packages/engine.io-client/package.json
@@ -2,7 +2,7 @@
   "name": "engine.io-client",
   "description": "Client for the realtime Engine",
   "license": "MIT",
-  "version": "6.6.2",
+  "version": "6.6.3",
   "main": "./build/cjs/index.js",
   "module": "./build/esm/index.js",
   "exports": {