diff --git a/THIRD_PARTY.txt b/THIRD_PARTY.txt
index 1eaa5cef..e62a4246 100644
--- a/THIRD_PARTY.txt
+++ b/THIRD_PARTY.txt
@@ -1511,7 +1511,7 @@ https://cdnjs.cloudflare.com/ajax/libs/slider-pro/1.6.0/js/jquery.sliderPro.min.
 https://cdnjs.cloudflare.com/ajax/libs/snowplow/2.18.0/sp.min.js
 https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.4.0/socket.io.min.js
 https://cdnjs.cloudflare.com/ajax/libs/socket.io/3.1.3/socket.io.min.js
-https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.1.2/socket.io.min.js
+https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.1.3/socket.io.min.js
 https://cdnjs.cloudflare.com/ajax/libs/spin.js/2.3.2/spin.min.js
 https://cdnjs.cloudflare.com/ajax/libs/spin.js/3.1.0/spin.min.js
 https://cdnjs.cloudflare.com/ajax/libs/spin.js/4.1.0/spin.min.js
diff --git a/modules/internal/targets.js b/modules/internal/targets.js
index b6ed9a8c..904e8da1 100644
--- a/modules/internal/targets.js
+++ b/modules/internal/targets.js
@@ -559,7 +559,7 @@ targets.setLastVersion = function (type, version) {
     } else if (type.startsWith('/socket.io/3.')) {
         return '3.1.3';
     } else if (type.startsWith('/socket.io/4.')) {
-        return '4.1.2';
+        return '4.1.3';
     } else if (type.startsWith('/spin.js/2.')) {
         return '2.3.2';
     } else if (type.startsWith('/spin.js/3.')) {
diff --git a/pages/updates/updates.html b/pages/updates/updates.html
index d71b9c4a..3f036782 100644
--- a/pages/updates/updates.html
+++ b/pages/updates/updates.html
@@ -61,6 +61,7 @@
                         <li>Fixed: Unblock Google Fonts (<a href="https://codeberg.org/nobody/LocalCDN/issues/561">#561</a>)</li>
                         <li>Mapping: jquery-mobile -> ajax.googleapis.com (<a href="https://codeberg.org/nobody/LocalCDN/issues/564">#564</a>)</li>
                         <li>Updated: highlight.js v11.0.1 -> v11.1.0 (<a href="https://codeberg.org/nobody/LocalCDN/issues/565">#565</a>)</li>
+                        <li>Updated: socket.io v4.1.2 -> v4.1.3 (<a href="https://codeberg.org/nobody/LocalCDN/issues/566">#566</a>)</li>
                         <li><strong>Includes also the following changes, because the release of this version took a long time caused by a broken validation server of Mozilla (<a href="https://codeberg.org/nobody/LocalCDN/issues/490">More information</a>).</strong>
                             <ul>
                                 <li>Ruleset generator for NoScript (<a href="https://codeberg.org/nobody/LocalCDN/issues/489">#489</a>)</li>
diff --git a/resources/socket.io/4.1.2/socket.io.min.jsm b/resources/socket.io/4.1.2/socket.io.min.jsm
deleted file mode 100644
index 6c1d8a77..00000000
--- a/resources/socket.io/4.1.2/socket.io.min.jsm
+++ /dev/null
@@ -1,7 +0,0 @@
-/*!
- * Socket.IO v4.1.2
- * (c) 2014-2021 Guillermo Rauch
- * Released under the MIT License.
- */
-!function(t,e){"object"==typeof exports&&"object"==typeof module?module.exports=e():"function"==typeof define&&define.amd?define([],e):"object"==typeof exports?exports.io=e():t.io=e()}(self,(function(){return function(t){var e={};function n(r){if(e[r])return e[r].exports;var o=e[r]={i:r,l:!1,exports:{}};return t[r].call(o.exports,o,o.exports,n),o.l=!0,o.exports}return n.m=t,n.c=e,n.d=function(t,e,r){n.o(t,e)||Object.defineProperty(t,e,{enumerable:!0,get:r})},n.r=function(t){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(t,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(t,"__esModule",{value:!0})},n.t=function(t,e){if(1&e&&(t=n(t)),8&e)return t;if(4&e&&"object"==typeof t&&t&&t.__esModule)return t;var r=Object.create(null);if(n.r(r),Object.defineProperty(r,"default",{enumerable:!0,value:t}),2&e&&"string"!=typeof t)for(var o in t)n.d(r,o,function(e){return t[e]}.bind(null,o));return r},n.n=function(t){var e=t&&t.__esModule?function(){return 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n.type="TransportError",n.description=e,this.emit("error",n),this}},{key:"open",value:function(){return"closed"!==this.readyState&&""!==this.readyState||(this.readyState="opening",this.doOpen()),this}},{key:"close",value:function(){return"opening"!==this.readyState&&"open"!==this.readyState||(this.doClose(),this.onClose()),this}},{key:"send",value:function(t){"open"===this.readyState&&this.write(t)}},{key:"onOpen",value:function(){this.readyState="open",this.writable=!0,this.emit("open")}},{key:"onData",value:function(t){var e=u.decodePacket(t,this.socket.binaryType);this.onPacket(e)}},{key:"onPacket",value:function(t){this.emit("packet",t)}},{key:"onClose",value:function(){this.readyState="closed",this.emit("close")}}])&&o(e.prototype,n),r&&o(e,r),a}(n(1));t.exports=f},function(t,e){e.encode=function(t){var e="";for(var n in t)t.hasOwnProperty(n)&&(e.length&&(e+="&"),e+=encodeURIComponent(n)+"="+encodeURIComponent(t[n]));return e},e.decode=function(t){for(var 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p,h=n(1),y=n(30),d=n(15);e.protocol=5,function(t){t[t.CONNECT=0]="CONNECT",t[t.DISCONNECT=1]="DISCONNECT",t[t.EVENT=2]="EVENT",t[t.ACK=3]="ACK",t[t.CONNECT_ERROR=4]="CONNECT_ERROR",t[t.BINARY_EVENT=5]="BINARY_EVENT",t[t.BINARY_ACK=6]="BINARY_ACK"}(p=e.PacketType||(e.PacketType={}));var v=function(){function t(){u(this,t)}return l(t,[{key:"encode",value:function(t){return t.type!==p.EVENT&&t.type!==p.ACK||!d.hasBinary(t)?[this.encodeAsString(t)]:(t.type=t.type===p.EVENT?p.BINARY_EVENT:p.BINARY_ACK,this.encodeAsBinary(t))}},{key:"encodeAsString",value:function(t){var e=""+t.type;return t.type!==p.BINARY_EVENT&&t.type!==p.BINARY_ACK||(e+=t.attachments+"-"),t.nsp&&"/"!==t.nsp&&(e+=t.nsp+","),null!=t.id&&(e+=t.id),null!=t.data&&(e+=JSON.stringify(t.data)),e}},{key:"encodeAsBinary",value:function(t){var e=y.deconstructPacket(t),n=this.encodeAsString(e.packet),r=e.buffers;return r.unshift(n),r}}]),t}();e.Encoder=v;var b=function(t){!function(t,e){if("function"!=typeof e&&null!==e)throw new 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t.__proto__||Object.getPrototypeOf(t)})(t)}Object.defineProperty(e,"__esModule",{value:!0}),e.Manager=void 0;var u=n(20),f=n(14),l=n(5),p=n(16),h=n(31),y=function(t){!function(t,e){if("function"!=typeof e&&null!==e)throw new TypeError("Super expression must either be null or a function");t.prototype=Object.create(e&&e.prototype,{constructor:{value:t,writable:!0,configurable:!0}}),e&&i(t,e)}(y,t);var e,n,c,a=s(y);function y(t,e){var n;!function(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}(this,y),(n=a.call(this)).nsps={},n.subs=[],t&&"object"===r(t)&&(e=t,t=void 0),(e=e||{}).path=e.path||"/socket.io",n.opts=e,n.reconnection(!1!==e.reconnection),n.reconnectionAttempts(e.reconnectionAttempts||1/0),n.reconnectionDelay(e.reconnectionDelay||1e3),n.reconnectionDelayMax(e.reconnectionDelayMax||5e3),n.randomizationFactor(e.randomizationFactor||.5),n.backoff=new h({min:n.reconnectionDelay(),max:n.reconnectionDelayMax(),jitter:n.randomizationFactor()}),n.timeout(null==e.timeout?2e4:e.timeout),n._readyState="closed",n.uri=t;var o=e.parser||l;return n.encoder=new o.Encoder,n.decoder=new o.Decoder,n._autoConnect=!1!==e.autoConnect,n._autoConnect&&n.open(),n}return e=y,(n=[{key:"reconnection",value:function(t){return arguments.length?(this._reconnection=!!t,this):this._reconnection}},{key:"reconnectionAttempts",value:function(t){return void 0===t?this._reconnectionAttempts:(this._reconnectionAttempts=t,this)}},{key:"reconnectionDelay",value:function(t){var e;return void 0===t?this._reconnectionDelay:(this._reconnectionDelay=t,null===(e=this.backoff)||void 0===e||e.setMin(t),this)}},{key:"randomizationFactor",value:function(t){var e;return void 0===t?this._randomizationFactor:(this._randomizationFactor=t,null===(e=this.backoff)||void 0===e||e.setJitter(t),this)}},{key:"reconnectionDelayMax",value:function(t){var e;return void 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this.subs.push(o),this.subs.push(i),this}},{key:"connect",value:function(t){return this.open(t)}},{key:"onopen",value:function(){this.cleanup(),this._readyState="open",this.emitReserved("open");var t=this.engine;this.subs.push(p.on(t,"ping",this.onping.bind(this)),p.on(t,"data",this.ondata.bind(this)),p.on(t,"error",this.onerror.bind(this)),p.on(t,"close",this.onclose.bind(this)),p.on(this.decoder,"decoded",this.ondecoded.bind(this)))}},{key:"onping",value:function(){this.emitReserved("ping")}},{key:"ondata",value:function(t){this.decoder.add(t)}},{key:"ondecoded",value:function(t){this.emitReserved("packet",t)}},{key:"onerror",value:function(t){this.emitReserved("error",t)}},{key:"socket",value:function(t,e){var n=this.nsps[t];return n||(n=new f.Socket(this,t,e),this.nsps[t]=n),n}},{key:"_destroy",value:function(t){for(var e=0,n=Object.keys(this.nsps);e<n.length;e++){var r=n[e];if(this.nsps[r].active)return}this._close()}},{key:"_packet",value:function(t){for(var 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new file mode 100644
index 00000000..bc1643f2
--- /dev/null
+++ b/resources/socket.io/4.1.3/socket.io.min.jsm
@@ -0,0 +1,7 @@
+/*!
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+ * (c) 2014-2021 Guillermo Rauch
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+ */
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