diff --git a/wp-includes/js/backbone.js b/wp-includes/js/backbone.js
index 2f8db37212..aa36f1e0f0 100644
--- a/wp-includes/js/backbone.js
+++ b/wp-includes/js/backbone.js
@@ -1,6 +1,6 @@
-//     Backbone.js 1.5.0
+//     Backbone.js 1.6.0
 
-//     (c) 2010-2022 Jeremy Ashkenas and DocumentCloud
+//     (c) 2010-2024 Jeremy Ashkenas and DocumentCloud
 //     Backbone may be freely distributed under the MIT license.
 //     For all details and documentation:
 //     http://backbonejs.org
@@ -44,7 +44,7 @@
   var slice = Array.prototype.slice;
 
   // Current version of the library. Keep in sync with `package.json`.
-  Backbone.VERSION = '1.5.0';
+  Backbone.VERSION = '1.6.0';
 
   // For Backbone's purposes, jQuery, Zepto, Ender, or My Library (kidding) owns
   // the `$` variable.
@@ -1085,7 +1085,7 @@
       var success = options.success;
       options.success = function(m, resp, callbackOpts) {
         if (wait) {
-          m.off('error', this._forwardPristineError, this);
+          m.off('error', collection._forwardPristineError, collection);
           collection.add(m, callbackOpts);
         }
         if (success) success.call(callbackOpts.context, m, resp, callbackOpts);
@@ -1985,7 +1985,10 @@
         current = this.getHash(this.iframe.contentWindow);
       }
 
-      if (current === this.fragment) return false;
+      if (current === this.fragment) {
+        if (!this.matchRoot()) return this.notfound();
+        return false;
+      }
       if (this.iframe) this.navigate(current);
       this.loadUrl();
     },
@@ -1995,14 +1998,22 @@
     // returns `false`.
     loadUrl: function(fragment) {
       // If the root doesn't match, no routes can match either.
-      if (!this.matchRoot()) return false;
+      if (!this.matchRoot()) return this.notfound();
       fragment = this.fragment = this.getFragment(fragment);
       return _.some(this.handlers, function(handler) {
         if (handler.route.test(fragment)) {
           handler.callback(fragment);
           return true;
         }
-      });
+      }) || this.notfound();
+    },
+
+    // When no route could be matched, this method is called internally to
+    // trigger the `'notfound'` event. It returns `false` so that it can be used
+    // in tail position.
+    notfound: function() {
+      this.trigger('notfound');
+      return false;
     },
 
     // Save a fragment into the hash history, or replace the URL state if the
@@ -2133,5 +2144,12 @@
     };
   };
 
+  // Provide useful information when things go wrong. This method is not meant
+  // to be used directly; it merely provides the necessary introspection for the
+  // external `debugInfo` function.
+  Backbone._debug = function() {
+    return {root: root, _: _};
+  };
+
   return Backbone;
 });
diff --git a/wp-includes/js/backbone.min.js b/wp-includes/js/backbone.min.js
index b674cc22b7..40246777a2 100644
--- a/wp-includes/js/backbone.min.js
+++ b/wp-includes/js/backbone.min.js
@@ -1,2 +1,2 @@
 /*! This file is auto-generated */
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e=i.reset?"reset":"set";s[e](t,i),n&&n.call(i.context,s,t,i),s.trigger("sync",s,t,i)},N(this,i),this.sync("read",this,i)},create:function(t,e){var n=(e=e?b.clone(e):{}).wait;if(!(t=this._prepareModel(t,e)))return!1;n||this.add(t,e);var s=this,r=e.success;return e.success=function(t,e,i){n&&(t.off("error",s._forwardPristineError,s),s.add(t,i)),r&&r.call(i.context,t,e,i)},n&&t.once("error",this._forwardPristineError,this),t.save(null,e),t},parse:function(t,e){return t},clone:function(){return new this.constructor(this.models,{model:this.model,comparator:this.comparator})},modelId:function(t,e){return t[e||this.model.prototype.idAttribute||"id"]},values:function(){return new E(this,S)},keys:function(){return new E(this,I)},entries:function(){return new E(this,k)},_reset:function(){this.length=0,this.models=[],this._byId={}},_prepareModel:function(t,e){return this._isModel(t)?(t.collection||(t.collection=this),t):(t=((e=e?b.clone(e):{}).collection=this).model.prototype?new 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s,r;"destroy"===t&&this.remove(e,n),"changeId"===t&&(s=this.modelId(e.previousAttributes(),e.idAttribute),r=this.modelId(e.attributes,e.idAttribute),null!=s&&delete this._byId[s],null!=r)&&(this._byId[r]=e)}this.trigger.apply(this,arguments)},_forwardPristineError:function(t,e,i){this.has(t)||this._onModelEvent("error",t,e,i)}}),"function"==typeof Symbol&&Symbol.iterator),E=(y&&(m.prototype[y]=m.prototype.values),function(t,e){this._collection=t,this._kind=e,this._index=0}),S=1,I=2,k=3,y=(y&&(E.prototype[y]=function(){return this}),E.prototype.next=function(){if(this._collection){var t,e;if(this._index<this._collection.length)return t=this._collection.at(this._index),this._index++,{value:this._kind===S?t:(e=this._collection.modelId(t.attributes,t.idAttribute),this._kind===I?e:[e,t]),done:!1};this._collection=void 0}return{value:void 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this.$el.on(t+".delegateEvents"+this.cid,e,i),this},undelegateEvents:function(){return this.$el&&this.$el.off(".delegateEvents"+this.cid),this},undelegate:function(t,e,i){return this.$el.off(t+".delegateEvents"+this.cid,e,i),this},_createElement:function(t){return document.createElement(t)},_ensureElement:function(){var t;this.el?this.setElement(b.result(this,"el")):(t=b.extend({},b.result(this,"attributes")),this.id&&(t.id=b.result(this,"id")),this.className&&(t.class=b.result(this,"className")),this.setElement(this._createElement(b.result(this,"tagName"))),this._setAttributes(t))},_setAttributes:function(t){this.$el.attr(t)}}),function(e,t){var i;return b.isFunction(e)?e:b.isObject(e)&&!t._isModel(e)?(i=b.matches(e),function(t){return i(t.attributes)}):b.isString(e)?function(t){return t.get(e)}:e}),H=(b.each([[m,{forEach:3,each:3,map:3,collect:3,reduce:0,foldl:0,inject:0,reduceRight:0,foldr:0,find:3,detect:3,filter:3,select:3,reject:3,every:3,all:3,some:3,any:3,include:3,includes:3,contains:3,invoke:0,max:3,min:3,toArray:1,size:1,first:3,head:3,take:3,initial:3,rest:3,tail:3,drop:3,last:3,without:0,difference:0,indexOf:3,shuffle:1,lastIndexOf:3,isEmpty:1,chain:1,sample:3,partition:3,groupBy:3,countBy:3,sortBy:3,indexBy:3,findIndex:3,findLastIndex:3},"models"],[v,{keys:1,values:1,pairs:1,invert:1,pick:0,omit:0,chain:1,isEmpty:1},"attributes"]],function(t){var i=t[0],e=t[1],n=t[2];i.mixin=function(t){var e=b.reduce(b.functions(t),function(t,e){return t[e]=0,t},{});s(i,t,e,n)},s(i,b,e,n)}),h.sync=function(t,e,n){var i,s=H[t],r=(b.defaults(n=n||{},{emulateHTTP:h.emulateHTTP,emulateJSON:h.emulateJSON}),{type:s,dataType:"json"}),o=(n.url||(r.url=b.result(e,"url")||M()),null!=n.data||!e||"create"!==t&&"update"!==t&&"patch"!==t||(r.contentType="application/json",r.data=JSON.stringify(n.attrs||e.toJSON(n))),n.emulateJSON&&(r.contentType="application/x-www-form-urlencoded",r.data=r.data?{model:r.data}:{}),!n.emulateHTTP||"PUT"!==s&&"DELETE"!==s&&"PATCH"!==s||(r.type="POST",n.emulateJSON&&(r.data._method=s),i=n.beforeSend,n.beforeSend=function(t){if(t.setRequestHeader("X-HTTP-Method-Override",s),i)return i.apply(this,arguments)}),"GET"===r.type||n.emulateJSON||(r.processData=!1),n.error),t=(n.error=function(t,e,i){n.textStatus=e,n.errorThrown=i,o&&o.call(n.context,t,e,i)},n.xhr=h.ajax(b.extend(r,n)));return e.trigger("request",e,t,n),t},{create:"POST",update:"PUT",patch:"PATCH",delete:"DELETE",read:"GET"}),$=(h.ajax=function(){return 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t=t.replace(U,"\\$&").replace(C,"(?:$1)?").replace(j,function(t,e){return e?t:"([^/?]+)"}).replace(O,"([^?]*?)"),new RegExp("^"+t+"(?:\\?([\\s\\S]*))?$")},_extractParameters:function(t,e){var i=t.exec(e).slice(1);return b.map(i,function(t,e){return e===i.length-1?t||null:t?decodeURIComponent(t):null})}}),h.History=function(){this.handlers=[],this.checkUrl=this.checkUrl.bind(this),"undefined"!=typeof window&&(this.location=window.location,this.history=window.history)}),z=/^[#\/]|\s+$/g,q=/^\/+|\/+$/g,F=/#.*$/,M=(R.started=!1,b.extend(R.prototype,e,{interval:50,atRoot:function(){return this.location.pathname.replace(/[^\/]$/,"$&/")===this.root&&!this.getSearch()},matchRoot:function(){return this.decodeFragment(this.location.pathname).slice(0,this.root.length-1)+"/"===this.root},decodeFragment:function(t){return decodeURI(t.replace(/%25/g,"%2525"))},getSearch:function(){var t=this.location.href.replace(/#.*/,"").match(/\?.+/);return t?t[0]:""},getHash:function(t){t=(t||this).location.href.match(/#(.*)$/);return t?t[1]:""},getPath:function(){var t=this.decodeFragment(this.location.pathname+this.getSearch()).slice(this.root.length-1);return"/"===t.charAt(0)?t.slice(1):t},getFragment:function(t){return(t=null==t?this._usePushState||!this._wantsHashChange?this.getPath():this.getHash():t).replace(z,"")},start:function(t){if(R.started)throw new Error("Backbone.history has already been started");if(R.started=!0,this.options=b.extend({root:"/"},this.options,t),this.root=this.options.root,this._trailingSlash=this.options.trailingSlash,this._wantsHashChange=!1!==this.options.hashChange,this._hasHashChange="onhashchange"in window&&(void 0===document.documentMode||7<document.documentMode),this._useHashChange=this._wantsHashChange&&this._hasHashChange,this._wantsPushState=!!this.options.pushState,this._hasPushState=!(!this.history||!this.history.pushState),this._usePushState=this._wantsPushState&&this._hasPushState,this.fragment=this.getFragment(),this.root=("/"+this.root+"/").replace(q,"/"),this._wantsHashChange&&this._wantsPushState){if(!this._hasPushState&&!this.atRoot())return t=this.root.slice(0,-1)||"/",this.location.replace(t+"#"+this.getPath()),!0;this._hasPushState&&this.atRoot()&&this.navigate(this.getHash(),{replace:!0})}this._hasHashChange||!this._wantsHashChange||this._usePushState||(this.iframe=document.createElement("iframe"),this.iframe.src="javascript:0",this.iframe.style.display="none",this.iframe.tabIndex=-1,(t=(t=document.body).insertBefore(this.iframe,t.firstChild).contentWindow).document.open(),t.document.close(),t.location.hash="#"+this.fragment);t=window.addEventListener||function(t,e){return attachEvent("on"+t,e)};if(this._usePushState?t("popstate",this.checkUrl,!1):this._useHashChange&&!this.iframe?t("hashchange",this.checkUrl,!1):this._wantsHashChange&&(this._checkUrlInterval=setInterval(this.checkUrl,this.interval)),!this.options.silent)return this.loadUrl()},stop:function(){var t=window.removeEventListener||function(t,e){return detachEvent("on"+t,e)};this._usePushState?t("popstate",this.checkUrl,!1):this._useHashChange&&!this.iframe&&t("hashchange",this.checkUrl,!1),this.iframe&&(document.body.removeChild(this.iframe),this.iframe=null),this._checkUrlInterval&&clearInterval(this._checkUrlInterval),R.started=!1},route:function(t,e){this.handlers.unshift({route:t,callback:e})},checkUrl:function(t){var e=this.getFragment();if((e=e===this.fragment&&this.iframe?this.getHash(this.iframe.contentWindow):e)===this.fragment)return!this.matchRoot()&&this.notfound();this.iframe&&this.navigate(e),this.loadUrl()},loadUrl:function(e){return this.matchRoot()&&(e=this.fragment=this.getFragment(e),b.some(this.handlers,function(t){if(t.route.test(e))return t.callback(e),!0}))||this.notfound()},notfound:function(){return this.trigger("notfound"),!1},navigate:function(t,e){if(!R.started)return!1;e&&!0!==e||(e={trigger:!!e}),t=this.getFragment(t||"");var i=this.root,i=(i=this._trailingSlash||""!==t&&"?"!==t.charAt(0)?i:i.slice(0,-1)||"/")+t,n=(t=t.replace(F,""),this.decodeFragment(t));if(this.fragment!==n){if(this.fragment=n,this._usePushState)this.history[e.replace?"replaceState":"pushState"]({},document.title,i);else{if(!this._wantsHashChange)return this.location.assign(i);this._updateHash(this.location,t,e.replace),this.iframe&&t!==this.getHash(this.iframe.contentWindow)&&(n=this.iframe.contentWindow,e.replace||(n.document.open(),n.document.close()),this._updateHash(n.location,t,e.replace))}return e.trigger?this.loadUrl(t):void 0}},_updateHash:function(t,e,i){i?(i=t.href.replace(/(javascript:|#).*$/,""),t.replace(i+"#"+e)):t.hash="#"+e}}),h.history=new R,v.extend=m.extend=$.extend=y.extend=R.extend=function(t,e){var i=this,n=t&&b.has(t,"constructor")?t.constructor:function(){return i.apply(this,arguments)};return b.extend(n,i,e),n.prototype=b.create(i.prototype,t),(n.prototype.constructor=n).__super__=i.prototype,n},function(){throw new Error('A "url" property or function must be specified')}),N=function(e,i){var n=i.error;i.error=function(t){n&&n.call(i.context,e,t,i),e.trigger("error",e,t,i)}};return h._debug=function(){return{root:t,_:b}},h});
\ No newline at end of file
diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index 24a35a2919..2852dc2431 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -1040,7 +1040,7 @@ function wp_default_scripts( $scripts ) {
 	did_action( 'init' ) && $scripts->add_data( 'json2', 'conditional', 'lt IE 8' );
 
 	$scripts->add( 'underscore', "/wp-includes/js/underscore$dev_suffix.js", array(), '1.13.4', 1 );
-	$scripts->add( 'backbone', "/wp-includes/js/backbone$dev_suffix.js", array( 'underscore', 'jquery' ), '1.5.0', 1 );
+	$scripts->add( 'backbone', "/wp-includes/js/backbone$dev_suffix.js", array( 'underscore', 'jquery' ), '1.6.0', 1 );
 
 	$scripts->add( 'wp-util', "/wp-includes/js/wp-util$suffix.js", array( 'underscore', 'jquery' ), false, 1 );
 	did_action( 'init' ) && $scripts->localize(
diff --git a/wp-includes/version.php b/wp-includes/version.php
index d93724149e..b1ad4173fb 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58871';
+$wp_version = '6.7-alpha-58872';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.