diff --git a/CHANGELOG.md b/CHANGELOG.md
index 67db67543..120081951 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # History
 
+## 2024
+
+- [6.5.4](#654-2024-06-18) (Jun 2024) (from the [6.5.x](https://github.com/socketio/engine.io-client/tree/6.5<.x) branch)
+
 ## 2023
 
 - [6.5.3](#653-2023-11-09) (Nov 2023)
@@ -40,6 +44,19 @@
 
 # Release notes
 
+## [6.5.4](https://github.com/socketio/engine.io-client/compare/6.5.3...6.5.4) (2024-06-18)
+
+This release contains a bump of the `ws` dependency, which includes an important [security fix](https://github.com/websockets/ws/commit/e55e5106f10fcbaac37cfa89759e4cc0d073a52c).
+
+Advisory: https://github.com/advisories/GHSA-3h5v-q93c-6h6q
+
+
+### Dependencies
+
+- [`ws@~8.17.1`](https://github.com/websockets/ws/releases/tag/8.17.1) ([diff](https://github.com/websockets/ws/compare/8.11.0...8.17.1))
+
+
+
 ## [6.5.3](https://github.com/socketio/engine.io-client/compare/6.5.2...6.5.3) (2023-11-09)
 
 
diff --git a/dist/engine.io.esm.min.js b/dist/engine.io.esm.min.js
index 98f9619e0..4c054ece1 100644
--- a/dist/engine.io.esm.min.js
+++ b/dist/engine.io.esm.min.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v6.5.3
- * (c) 2014-2023 Guillermo Rauch
+ * Engine.IO v6.5.4
+ * (c) 2014-2024 Guillermo Rauch
  * Released under the MIT License.
  */
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r=()=>{s||(e.send([{type:"ping",data:"probe"}]),e.once("packet",(t=>{if(!s)if("pong"===t.type&&"probe"===t.data){if(this.upgrading=!0,this.emitReserved("upgrading",e),!e)return;K.priorWebsocketSuccess="websocket"===e.name,this.transport.pause((()=>{s||"closed"!==this.readyState&&(c(),this.setTransport(e),e.send([{type:"upgrade"}]),this.emitReserved("upgrade",e),e=null,this.upgrading=!1,this.flush())}))}else{const t=new Error("probe error");t.transport=e.name,this.emitReserved("upgradeError",t)}})))};function i(){s||(s=!0,c(),e.close(),e=null)}const o=t=>{const s=new Error("probe error: "+t);s.transport=e.name,i(),this.emitReserved("upgradeError",s)};function n(){o("transport closed")}function a(){o("socket closed")}function h(t){e&&t.name!==e.name&&i()}const c=()=>{e.removeListener("open",r),e.removeListener("error",o),e.removeListener("close",n),this.off("close",a),this.off("upgrading",h)};e.once("open",r),e.once("error",o),e.once("close",n),this.once("close",a),this.once("upgrading",h),-1!==this.upgrades.indexOf("webtransport")&&"webtransport"!==t?this.setTimeoutFn((()=>{s||e.open()}),200):e.open()}onOpen(){if(this.readyState="open",K.priorWebsocketSuccess="websocket"===this.transport.name,this.emitReserved("open"),this.flush(),"open"===this.readyState&&this.opts.upgrade){let t=0;const e=this.upgrades.length;for(;t<e;t++)this.probe(this.upgrades[t])}}onPacket(t){if("opening"===this.readyState||"open"===this.readyState||"closing"===this.readyState)switch(this.emitReserved("packet",t),this.emitReserved("heartbeat"),this.resetPingTimeout(),t.type){case"open":this.onHandshake(JSON.parse(t.data));break;case"ping":this.sendPacket("pong"),this.emitReserved("ping"),this.emitReserved("pong");break;case"error":const e=new Error("server error");e.code=t.data,this.onError(e);break;case"message":this.emitReserved("data",t.data),this.emitReserved("message",t.data)}}onHandshake(t){this.emitReserved("handshake",t),this.id=t.sid,this.transport.query.sid=t.sid,this.upgrades=this.filterUpgrades(t.upgrades),this.pingInterval=t.pingInterval,this.pingTimeout=t.pingTimeout,this.maxPayload=t.maxPayload,this.onOpen(),"closed"!==this.readyState&&this.resetPingTimeout()}resetPingTimeout(){this.clearTimeoutFn(this.pingTimeoutTimer),this.pingTimeoutTimer=this.setTimeoutFn((()=>{this.onClose("ping timeout")}),this.pingInterval+this.pingTimeout),this.opts.autoUnref&&this.pingTimeoutTimer.unref()}onDrain(){this.writeBuffer.splice(0,this.prevBufferLen),this.prevBufferLen=0,0===this.writeBuffer.length?this.emitReserved("drain"):this.flush()}flush(){if("closed"!==this.readyState&&this.transport.writable&&!this.upgrading&&this.writeBuffer.length){const t=this.getWritablePackets();this.transport.send(t),this.prevBufferLen=t.length,this.emitReserved("flush")}}getWritablePackets(){if(!(this.maxPayload&&"polling"===this.transport.name&&this.writeBuffer.length>1))return this.writeBuffer;let t=1;for(let s=0;s<this.writeBuffer.length;s++){const r=this.writeBuffer[s].data;if(r&&(t+="string"==typeof(e=r)?function(t){let e=0,s=0;for(let r=0,i=t.length;r<i;r++)e=t.charCodeAt(r),e<128?s+=1:e<2048?s+=2:e<55296||e>=57344?s+=3:(r++,s+=4);return s}(e):Math.ceil(1.33*(e.byteLength||e.size))),s>0&&t>this.maxPayload)return this.writeBuffer.slice(0,s);t+=2}var e;return this.writeBuffer}write(t,e,s){return this.sendPacket("message",t,e,s),this}send(t,e,s){return this.sendPacket("message",t,e,s),this}sendPacket(t,e,s,r){if("function"==typeof e&&(r=e,e=void 0),"function"==typeof s&&(r=s,s=null),"closing"===this.readyState||"closed"===this.readyState)return;(s=s||{}).compress=!1!==s.compress;const i={type:t,data:e,options:s};this.emitReserved("packetCreate",i),this.writeBuffer.push(i),r&&this.once("flush",r),this.flush()}close(){const t=()=>{this.onClose("forced close"),this.transport.close()},e=()=>{this.off("upgrade",e),this.off("upgradeError",e),t()},s=()=>{this.once("upgrade",e),this.once("upgradeError",e)};return"opening"!==this.readyState&&"open"!==this.readyState||(this.readyState="closing",this.writeBuffer.length?this.once("drain",(()=>{this.upgrading?s():t()})):this.upgrading?s():t()),this}onError(t){K.priorWebsocketSuccess=!1,this.emitReserved("error",t),this.onClose("transport error",t)}onClose(t,e){"opening"!==this.readyState&&"open"!==this.readyState&&"closing"!==this.readyState||(this.clearTimeoutFn(this.pingTimeoutTimer),this.transport.removeAllListeners("close"),this.transport.close(),this.transport.removeAllListeners(),"function"==typeof removeEventListener&&(removeEventListener("beforeunload",this.beforeunloadEventListener,!1),removeEventListener("offline",this.offlineEventListener,!1)),this.readyState="closed",this.id=null,this.emitReserved("close",t,e),this.writeBuffer=[],this.prevBufferLen=0)}filterUpgrades(t){const e=[];let s=0;const r=t.length;for(;s<r;s++)~this.transports.indexOf(t[s])&&e.push(t[s]);return e}}K.protocol=4;const Q=K.protocol;export{K as Socket,q as Transport,E as TransportError,R as installTimerFunctions,N as nextTick,G as parse,Q as protocol,$ as transports};
diff --git a/dist/engine.io.js b/dist/engine.io.js
index 335b8ca9b..c6ee2b148 100644
--- a/dist/engine.io.js
+++ b/dist/engine.io.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v6.5.3
- * (c) 2014-2023 Guillermo Rauch
+ * Engine.IO v6.5.4
+ * (c) 2014-2024 Guillermo Rauch
  * Released under the MIT License.
  */
 (function (global, factory) {
diff --git a/dist/engine.io.min.js b/dist/engine.io.min.js
index 6d541b9a8..8cefdfe12 100644
--- a/dist/engine.io.min.js
+++ b/dist/engine.io.min.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v6.5.3
- * (c) 2014-2023 Guillermo Rauch
+ * Engine.IO v6.5.4
+ * (c) 2014-2024 Guillermo Rauch
  * Released under the MIT License.
  */
 !function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e||self).eio=t()}(this,(function(){"use strict";function e(t){return e="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e},e(t)}function t(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function r(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}function n(e,t,n){return t&&r(e.prototype,t),n&&r(e,n),e}function o(){return o=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var r=arguments[t];for(var n in r)Object.prototype.hasOwnProperty.call(r,n)&&(e[n]=r[n])}return e},o.apply(this,arguments)}function 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server"}),!1;t.onPacket(e)})),"closed"!==this.readyState&&(this.polling=!1,this.emitReserved("pollComplete"),"open"===this.readyState&&this.poll())}},{key:"doClose",value:function(){var e=this,t=function(){e.write([{type:"close"}])};"open"===this.readyState?t():this.once("open",t)}},{key:"write",value:function(e){var t=this;this.writable=!1,function(e,t){var r=e.length,n=new Array(r),o=0;e.forEach((function(e,i){T(e,!1,(function(e){n[i]=e,++o===r&&t(n.join(A))}))}))}(e,(function(e){t.doWrite(e,(function(){t.writable=!0,t.emitReserved("drain")}))}))}},{key:"uri",value:function(){var e=this.opts.secure?"https":"http",t=this.query||{};return!1!==this.opts.timestampRequests&&(t[this.opts.timestampParam]=Y()),this.supportsBinary||t.sid||(t.b64=1),this.createUri(e,t)}},{key:"request",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};return o(e,{xd:this.xd,cookieJar:this.cookieJar},this.opts),new ie(this.uri(),e)}},{key:"doWrite",value:function(e,t){var r=this,n=this.request({method:"POST",data:e});n.on("success",t),n.on("error",(function(e,t){r.onError("xhr post error",e,t)}))}},{key:"doPoll",value:function(){var e=this,t=this.request();t.on("data",this.onData.bind(this)),t.on("error",(function(t,r){e.onError("xhr poll error",t,r)})),this.pollXhr=t}},{key:"name",get:function(){return"polling"}}]),s}($),ie=function(e){i(o,e);var r=l(o);function o(e,n){var i;return t(this,o),W(h(i=r.call(this)),n),i.opts=n,i.method=n.method||"GET",i.uri=e,i.data=void 0!==n.data?n.data:null,i.create(),i}return n(o,[{key:"create",value:function(){var e,t=this,r=H(this.opts,"agent","pfx","key","passphrase","cert","ca","ciphers","rejectUnauthorized","autoUnref");r.xdomain=!!this.opts.xd;var n=this.xhr=new te(r);try{n.open(this.method,this.uri,!0);try{if(this.opts.extraHeaders)for(var i in n.setDisableHeaderCheck&&n.setDisableHeaderCheck(!0),this.opts.extraHeaders)this.opts.extraHeaders.hasOwnProperty(i)&&n.setRequestHeader(i,this.opts.extraHeaders[i])}catch(e){}if("POST"===this.method)try{n.setRequestHeader("Content-type","text/plain;charset=UTF-8")}catch(e){}try{n.setRequestHeader("Accept","*/*")}catch(e){}null===(e=this.opts.cookieJar)||void 0===e||e.addCookies(n),"withCredentials"in n&&(n.withCredentials=this.opts.withCredentials),this.opts.requestTimeout&&(n.timeout=this.opts.requestTimeout),n.onreadystatechange=function(){var e;3===n.readyState&&(null===(e=t.opts.cookieJar)||void 0===e||e.parseCookies(n)),4===n.readyState&&(200===n.status||1223===n.status?t.onLoad():t.setTimeoutFn((function(){t.onError("number"==typeof n.status?n.status:0)}),0))},n.send(this.data)}catch(e){return void this.setTimeoutFn((function(){t.onError(e)}),0)}"undefined"!=typeof document&&(this.index=o.requestsCount++,o.requests[this.index]=this)}},{key:"onError",value:function(e){this.emitReserved("error",e,this.xhr),this.cleanup(!0)}},{key:"cleanup",value:function(e){if(void 0!==this.xhr&&null!==this.xhr){if(this.xhr.onreadystatechange=re,e)try{this.xhr.abort()}catch(e){}"undefined"!=typeof document&&delete o.requests[this.index],this.xhr=null}}},{key:"onLoad",value:function(){var e=this.xhr.responseText;null!==e&&(this.emitReserved("data",e),this.emitReserved("success"),this.cleanup())}},{key:"abort",value:function(){this.cleanup()}}]),o}(D);if(ie.requestsCount=0,ie.requests={},"undefined"!=typeof document)if("function"==typeof attachEvent)attachEvent("onunload",se);else if("function"==typeof addEventListener){addEventListener("onpagehide"in F?"pagehide":"unload",se,!1)}function se(){for(var e in ie.requests)ie.requests.hasOwnProperty(e)&&ie.requests[e].abort()}var ae="function"==typeof Promise&&"function"==typeof Promise.resolve?function(e){return Promise.resolve().then(e)}:function(e,t){return t(e,0)},ue=F.WebSocket||F.MozWebSocket,ce="arraybuffer",fe="undefined"!=typeof navigator&&"string"==typeof navigator.product&&"reactnative"===navigator.product.toLowerCase(),he=function(e){i(o,e);var r=l(o);function o(e){var n;return t(this,o),(n=r.call(this,e)).supportsBinary=!e.forceBase64,n}return n(o,[{key:"doOpen",value:function(){if(this.check()){var e=this.uri(),t=this.opts.protocols,r=fe?{}:H(this.opts,"agent","perMessageDeflate","pfx","key","passphrase","cert","ca","ciphers","rejectUnauthorized","localAddress","protocolVersion","origin","maxPayload","family","checkServerIdentity");this.opts.extraHeaders&&(r.headers=this.opts.extraHeaders);try{this.ws=fe?new ue(e,t,r):t?new ue(e,t):new ue(e)}catch(e){return this.emitReserved("error",e)}this.ws.binaryType=this.socket.binaryType,this.addEventListeners()}}},{key:"addEventListeners",value:function(){var e=this;this.ws.onopen=function(){e.opts.autoUnref&&e.ws._socket.unref(),e.onOpen()},this.ws.onclose=function(t){return e.onClose({description:"websocket connection closed",context:t})},this.ws.onmessage=function(t){return e.onData(t.data)},this.ws.onerror=function(t){return e.onError("websocket error",t)}}},{key:"write",value:function(e){var t=this;this.writable=!1;for(var r=function(r){var n=e[r],o=r===e.length-1;T(n,t.supportsBinary,(function(e){try{t.ws.send(e)}catch(e){}o&&ae((function(){t.writable=!0,t.emitReserved("drain")}),t.setTimeoutFn)}))},n=0;n<e.length;n++)r(n)}},{key:"doClose",value:function(){void 0!==this.ws&&(this.ws.close(),this.ws=null)}},{key:"uri",value:function(){var e=this.opts.secure?"wss":"ws",t=this.query||{};return this.opts.timestampRequests&&(t[this.opts.timestampParam]=Y()),this.supportsBinary||(t.b64=1),this.createUri(e,t)}},{key:"check",value:function(){return!!ue}},{key:"name",get:function(){return"websocket"}}]),o}($),pe=function(e){i(o,e);var r=l(o);function o(){return t(this,o),r.apply(this,arguments)}return n(o,[{key:"doOpen",value:function(){var e=this;"function"==typeof WebTransport&&(this.transport=new WebTransport(this.createUri("https"),this.opts.transportOptions[this.name]),this.transport.closed.then((function(){e.onClose()})).catch((function(t){e.onError("webtransport error",t)})),this.transport.ready.then((function(){e.transport.createBidirectionalStream().then((function(t){var r=function(e,t){B||(B=new TextDecoder);var r=[],n=0,o=-1,i=!1;return new TransformStream({transform:function(s,a){for(r.push(s);;){if(0===n){if(_(r)<1)break;var u=j(r,1);i=128==(128&u[0]),o=127&u[0],n=o<126?3:126===o?1:2}else if(1===n){if(_(r)<2)break;var c=j(r,2);o=new DataView(c.buffer,c.byteOffset,c.length).getUint16(0),n=3}else if(2===n){if(_(r)<8)break;var f=j(r,8),h=new DataView(f.buffer,f.byteOffset,f.length),p=h.getUint32(0);if(p>Math.pow(2,21)-1){a.enqueue(m);break}o=p*Math.pow(2,32)+h.getUint32(4),n=3}else{if(_(r)<o)break;var l=j(r,o);a.enqueue(C(i?l:B.decode(l),t)),n=0}if(0===o||o>e){a.enqueue(m);break}}}})}(Number.MAX_SAFE_INTEGER,e.socket.binaryType),n=t.readable.pipeThrough(r).getReader(),o=U();o.readable.pipeTo(t.writable),e.writer=o.writable.getWriter();!function t(){n.read().then((function(r){var n=r.done,o=r.value;n||(e.onPacket(o),t())})).catch((function(e){}))}();var i={type:"open"};e.query.sid&&(i.data='{"sid":"'.concat(e.query.sid,'"}')),e.writer.write(i).then((function(){return e.onOpen()}))}))})))}},{key:"write",value:function(e){var t=this;this.writable=!1;for(var r=function(r){var n=e[r],o=r===e.length-1;t.writer.write(n).then((function(){o&&ae((function(){t.writable=!0,t.emitReserved("drain")}),t.setTimeoutFn)}))},n=0;n<e.length;n++)r(n)}},{key:"doClose",value:function(){var e;null===(e=this.transport)||void 0===e||e.close()}},{key:"name",get:function(){return"webtransport"}}]),o}($),le={websocket:he,webtransport:pe,polling:oe},de=/^(?:(?![^:@\/?#]+:[^:@\/]*@)(http|https|ws|wss):\/\/)?((?:(([^:@\/?#]*)(?::([^:@\/?#]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/,ye=["source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","anchor"];function ve(e){if(e.length>2e3)throw"URI too long";var t=e,r=e.indexOf("["),n=e.indexOf("]");-1!=r&&-1!=n&&(e=e.substring(0,r)+e.substring(r,n).replace(/:/g,";")+e.substring(n,e.length));for(var o,i,s=de.exec(e||""),a={},u=14;u--;)a[ye[u]]=s[u]||"";return-1!=r&&-1!=n&&(a.source=t,a.host=a.host.substring(1,a.host.length-1).replace(/;/g,":"),a.authority=a.authority.replace("[","").replace("]","").replace(/;/g,":"),a.ipv6uri=!0),a.pathNames=function(e,t){var r=/\/{2,9}/g,n=t.replace(r,"/").split("/");"/"!=t.slice(0,1)&&0!==t.length||n.splice(0,1);"/"==t.slice(-1)&&n.splice(n.length-1,1);return n}(0,a.path),a.queryKey=(o=a.query,i={},o.replace(/(?:^|&)([^&=]*)=?([^&]*)/g,(function(e,t,r){t&&(i[t]=r)})),i),a}var ge=function(r){i(a,r);var s=l(a);function a(r){var n,i=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};return t(this,a),(n=s.call(this)).binaryType=ce,n.writeBuffer=[],r&&"object"===e(r)&&(i=r,r=null),r?(r=ve(r),i.hostname=r.host,i.secure="https"===r.protocol||"wss"===r.protocol,i.port=r.port,r.query&&(i.query=r.query)):i.host&&(i.hostname=ve(i.host).host),W(h(n),i),n.secure=null!=i.secure?i.secure:"undefined"!=typeof location&&"https:"===location.protocol,i.hostname&&!i.port&&(i.port=n.secure?"443":"80"),n.hostname=i.hostname||("undefined"!=typeof location?location.hostname:"localhost"),n.port=i.port||("undefined"!=typeof location&&location.port?location.port:n.secure?"443":"80"),n.transports=i.transports||["polling","websocket","webtransport"],n.writeBuffer=[],n.prevBufferLen=0,n.opts=o({path:"/engine.io",agent:!1,withCredentials:!1,upgrade:!0,timestampParam:"t",rememberUpgrade:!1,addTrailingSlash:!0,rejectUnauthorized:!0,perMessageDeflate:{threshold:1024},transportOptions:{},closeOnBeforeunload:!1},i),n.opts.path=n.opts.path.replace(/\/$/,"")+(n.opts.addTrailingSlash?"/":""),"string"==typeof n.opts.query&&(n.opts.query=N(n.opts.query)),n.id=null,n.upgrades=null,n.pingInterval=null,n.pingTimeout=null,n.pingTimeoutTimer=null,"function"==typeof addEventListener&&(n.opts.closeOnBeforeunload&&(n.beforeunloadEventListener=function(){n.transport&&(n.transport.removeAllListeners(),n.transport.close())},addEventListener("beforeunload",n.beforeunloadEventListener,!1)),"localhost"!==n.hostname&&(n.offlineEventListener=function(){n.onClose("transport close",{description:"network connection lost"})},addEventListener("offline",n.offlineEventListener,!1))),n.open(),n}return n(a,[{key:"createTransport",value:function(e){var t=o({},this.opts.query);t.EIO=4,t.transport=e,this.id&&(t.sid=this.id);var r=o({},this.opts,{query:t,socket:this,hostname:this.hostname,secure:this.secure,port:this.port},this.opts.transportOptions[e]);return new le[e](r)}},{key:"open",value:function(){var e,t=this;if(this.opts.rememberUpgrade&&a.priorWebsocketSuccess&&-1!==this.transports.indexOf("websocket"))e="websocket";else{if(0===this.transports.length)return void this.setTimeoutFn((function(){t.emitReserved("error","No transports available")}),0);e=this.transports[0]}this.readyState="opening";try{e=this.createTransport(e)}catch(e){return this.transports.shift(),void this.open()}e.open(),this.setTransport(e)}},{key:"setTransport",value:function(e){var t=this;this.transport&&this.transport.removeAllListeners(),this.transport=e,e.on("drain",this.onDrain.bind(this)).on("packet",this.onPacket.bind(this)).on("error",this.onError.bind(this)).on("close",(function(e){return t.onClose("transport close",e)}))}},{key:"probe",value:function(e){var t=this,r=this.createTransport(e),n=!1;a.priorWebsocketSuccess=!1;var o=function(){n||(r.send([{type:"ping",data:"probe"}]),r.once("packet",(function(e){if(!n)if("pong"===e.type&&"probe"===e.data){if(t.upgrading=!0,t.emitReserved("upgrading",r),!r)return;a.priorWebsocketSuccess="websocket"===r.name,t.transport.pause((function(){n||"closed"!==t.readyState&&(h(),t.setTransport(r),r.send([{type:"upgrade"}]),t.emitReserved("upgrade",r),r=null,t.upgrading=!1,t.flush())}))}else{var o=new Error("probe error");o.transport=r.name,t.emitReserved("upgradeError",o)}})))};function i(){n||(n=!0,h(),r.close(),r=null)}var s=function(e){var n=new Error("probe error: "+e);n.transport=r.name,i(),t.emitReserved("upgradeError",n)};function u(){s("transport closed")}function c(){s("socket closed")}function f(e){r&&e.name!==r.name&&i()}var h=function(){r.removeListener("open",o),r.removeListener("error",s),r.removeListener("close",u),t.off("close",c),t.off("upgrading",f)};r.once("open",o),r.once("error",s),r.once("close",u),this.once("close",c),this.once("upgrading",f),-1!==this.upgrades.indexOf("webtransport")&&"webtransport"!==e?this.setTimeoutFn((function(){n||r.open()}),200):r.open()}},{key:"onOpen",value:function(){if(this.readyState="open",a.priorWebsocketSuccess="websocket"===this.transport.name,this.emitReserved("open"),this.flush(),"open"===this.readyState&&this.opts.upgrade)for(var e=0,t=this.upgrades.length;e<t;e++)this.probe(this.upgrades[e])}},{key:"onPacket",value:function(e){if("opening"===this.readyState||"open"===this.readyState||"closing"===this.readyState)switch(this.emitReserved("packet",e),this.emitReserved("heartbeat"),this.resetPingTimeout(),e.type){case"open":this.onHandshake(JSON.parse(e.data));break;case"ping":this.sendPacket("pong"),this.emitReserved("ping"),this.emitReserved("pong");break;case"error":var t=new Error("server error");t.code=e.data,this.onError(t);break;case"message":this.emitReserved("data",e.data),this.emitReserved("message",e.data)}}},{key:"onHandshake",value:function(e){this.emitReserved("handshake",e),this.id=e.sid,this.transport.query.sid=e.sid,this.upgrades=this.filterUpgrades(e.upgrades),this.pingInterval=e.pingInterval,this.pingTimeout=e.pingTimeout,this.maxPayload=e.maxPayload,this.onOpen(),"closed"!==this.readyState&&this.resetPingTimeout()}},{key:"resetPingTimeout",value:function(){var e=this;this.clearTimeoutFn(this.pingTimeoutTimer),this.pingTimeoutTimer=this.setTimeoutFn((function(){e.onClose("ping timeout")}),this.pingInterval+this.pingTimeout),this.opts.autoUnref&&this.pingTimeoutTimer.unref()}},{key:"onDrain",value:function(){this.writeBuffer.splice(0,this.prevBufferLen),this.prevBufferLen=0,0===this.writeBuffer.length?this.emitReserved("drain"):this.flush()}},{key:"flush",value:function(){if("closed"!==this.readyState&&this.transport.writable&&!this.upgrading&&this.writeBuffer.length){var e=this.getWritablePackets();this.transport.send(e),this.prevBufferLen=e.length,this.emitReserved("flush")}}},{key:"getWritablePackets",value:function(){if(!(this.maxPayload&&"polling"===this.transport.name&&this.writeBuffer.length>1))return this.writeBuffer;for(var e,t=1,r=0;r<this.writeBuffer.length;r++){var n=this.writeBuffer[r].data;if(n&&(t+="string"==typeof(e=n)?function(e){for(var t=0,r=0,n=0,o=e.length;n<o;n++)(t=e.charCodeAt(n))<128?r+=1:t<2048?r+=2:t<55296||t>=57344?r+=3:(n++,r+=4);return r}(e):Math.ceil(1.33*(e.byteLength||e.size))),r>0&&t>this.maxPayload)return this.writeBuffer.slice(0,r);t+=2}return this.writeBuffer}},{key:"write",value:function(e,t,r){return this.sendPacket("message",e,t,r),this}},{key:"send",value:function(e,t,r){return this.sendPacket("message",e,t,r),this}},{key:"sendPacket",value:function(e,t,r,n){if("function"==typeof t&&(n=t,t=void 0),"function"==typeof r&&(n=r,r=null),"closing"!==this.readyState&&"closed"!==this.readyState){(r=r||{}).compress=!1!==r.compress;var o={type:e,data:t,options:r};this.emitReserved("packetCreate",o),this.writeBuffer.push(o),n&&this.once("flush",n),this.flush()}}},{key:"close",value:function(){var e=this,t=function(){e.onClose("forced close"),e.transport.close()},r=function r(){e.off("upgrade",r),e.off("upgradeError",r),t()},n=function(){e.once("upgrade",r),e.once("upgradeError",r)};return"opening"!==this.readyState&&"open"!==this.readyState||(this.readyState="closing",this.writeBuffer.length?this.once("drain",(function(){e.upgrading?n():t()})):this.upgrading?n():t()),this}},{key:"onError",value:function(e){a.priorWebsocketSuccess=!1,this.emitReserved("error",e),this.onClose("transport error",e)}},{key:"onClose",value:function(e,t){"opening"!==this.readyState&&"open"!==this.readyState&&"closing"!==this.readyState||(this.clearTimeoutFn(this.pingTimeoutTimer),this.transport.removeAllListeners("close"),this.transport.close(),this.transport.removeAllListeners(),"function"==typeof removeEventListener&&(removeEventListener("beforeunload",this.beforeunloadEventListener,!1),removeEventListener("offline",this.offlineEventListener,!1)),this.readyState="closed",this.id=null,this.emitReserved("close",e,t),this.writeBuffer=[],this.prevBufferLen=0)}},{key:"filterUpgrades",value:function(e){for(var t=[],r=0,n=e.length;r<n;r++)~this.transports.indexOf(e[r])&&t.push(e[r]);return t}}]),a}(D);ge.protocol=4;return function(e,t){return new ge(e,t)}}));
diff --git a/package.json b/package.json
index 52fe070b5..4c1cf7e0e 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "engine.io-client",
   "description": "Client for the realtime Engine",
   "license": "MIT",
-  "version": "6.5.3",
+  "version": "6.5.4",
   "main": "./build/cjs/index.js",
   "module": "./build/esm/index.js",
   "exports": {