diff --git a/appcast.xml b/appcast.xml
index 0242597..8ca7850 100644
--- a/appcast.xml
+++ b/appcast.xml
@@ -6,33 +6,18 @@
         <description>Most recent changes with links to updates.</description>
 
         <item>
-            <title>CotEditor 4.8.0-rc</title>
-            <pubDate>Sat, 13 Apr 2024 16:54:35 +0900</pubDate>
-            <sparkle:channel>prerelease</sparkle:channel>
-            <sparkle:version>639</sparkle:version>
-            <sparkle:shortVersionString>4.8.0-rc</sparkle:shortVersionString>
-            <sparkle:minimumSystemVersion>13.0</sparkle:minimumSystemVersion>
-            <sparkle:releaseNotesLink xml:lang="en">https://coteditor.com/releasenotes/4.8.0-beta.en.html</sparkle:releaseNotesLink>
-            <sparkle:releaseNotesLink xml:lang="ja">https://coteditor.com/releasenotes/4.8.0-beta.ja.html</sparkle:releaseNotesLink>
-            <enclosure url="https://github.com/coteditor/CotEditor/releases/download/4.8.0-rc/CotEditor_4.8.0-rc.dmg"
-                       length="15985222"
-                       type="application/octet-stream"
-                        sparkle:edSignature="MW9g0k+TU6Fl/pJAFJxU31gUcqeDBzXhedGF5fO7TCoXpgoMgfvNG4NiWNGewpef+Am3dxlDRU61gE03n3URCQ=="/>
-        </item>
-
-        <item>
-            <title>CotEditor 4.7.4</title>
-            <pubDate>Sun, 11 Feb 2024 18:02:54 +0900</pubDate>
+            <title>CotEditor 4.8.0</title>
+            <pubDate>Tue, 16 Apr 2024 10:00:00 +0900</pubDate>
             
-            <sparkle:version>630</sparkle:version>
-            <sparkle:shortVersionString>4.7.4</sparkle:shortVersionString>
+            <sparkle:version>642</sparkle:version>
+            <sparkle:shortVersionString>4.8.0</sparkle:shortVersionString>
             <sparkle:minimumSystemVersion>13.0</sparkle:minimumSystemVersion>
-            <sparkle:releaseNotesLink xml:lang="en">https://coteditor.com/releasenotes/4.7.4.en.html</sparkle:releaseNotesLink>
-            <sparkle:releaseNotesLink xml:lang="ja">https://coteditor.com/releasenotes/4.7.4.ja.html</sparkle:releaseNotesLink>
-            <enclosure url="https://github.com/coteditor/CotEditor/releases/download/4.7.4/CotEditor_4.7.4.dmg"
-                       length="14542970"
+            <sparkle:releaseNotesLink xml:lang="en">https://coteditor.com/releasenotes/4.8.0.en.html</sparkle:releaseNotesLink>
+            <sparkle:releaseNotesLink xml:lang="ja">https://coteditor.com/releasenotes/4.8.0.ja.html</sparkle:releaseNotesLink>
+            <enclosure url="https://github.com/coteditor/CotEditor/releases/download/4.8.0/CotEditor_4.8.0.dmg"
+                       length="15984982"
                        type="application/octet-stream"
-                        sparkle:edSignature="7idPLzRpW2dFdVlSwcXJTd++ue3MKMxp4bHw/UGaDw3czmQuRh1uMM6g3Qt1JtXnnY/Y4EwtI1JlmSeJxSbtAA=="/>
+                        sparkle:edSignature="X12PtymsefzyWT5l/bN+R77xdvg8uOOa1QW5Mi+v5hFK43iWaQYh3IG0PDUwJX+Ld9SA7azvtK+xWj3iIjaGAA=="/>
         </item>
         
         <item>
diff --git a/archives.html b/archives.html
index 27e3ff9..18dd312 100644
--- a/archives.html
+++ b/archives.html
@@ -50,19 +50,19 @@ <h2>CotEditor non-AppStore version</h2>
 
 <p>CotEditor is distributed on the <a href="https://itunes.apple.com/app/coteditor/id1024640650?ls=1" rel="external" title="CotEditor -Mac App Store">Mac App Store</a>. However, there is also a non-AppStore version just for in case.</p>
 
-<a href="https://github.com/coteditor/CotEditor/releases/download/4.7.4/CotEditor_4.7.4.dmg"
-		download="CotEditor_4.7.4.dmg"
-		title="Download | CotEditor_4.7.4.dmg">
+<a href="https://github.com/coteditor/CotEditor/releases/download/4.8.0/CotEditor_4.8.0.dmg"
+		download="CotEditor_4.8.0.dmg"
+		title="Download | CotEditor_4.8.0.dmg">
 		<img src="./img/appicon/64@2x.png" width="64" alt=""/>
-		CotEditor <span>4.7.4</span>
+		CotEditor <span>4.8.0</span>
 </a>
 <dl>
 	<dt>released on</dt>
-	<dd><time>2024-02-11</time></dd>
+	<dd><time>2024-04-15</time></dd>
 
 	<dt>release notes</dt>
-	<dd><a href="releasenotes/4.7.4.en" hreflang="en">en</a></dd>
-	<dd><a href="releasenotes/4.7.4.ja" hreflang="ja">ja</a></dd>
+	<dd><a href="releasenotes/4.8.0.en" hreflang="en">en</a></dd>
+	<dd><a href="releasenotes/4.8.0.ja" hreflang="ja">ja</a></dd>
 
 	<dt>requirements</dt>
 	<dd>macOS 13 or later</dd>
diff --git a/archives.ja.html b/archives.ja.html
index 164041d..8a50889 100644
--- a/archives.ja.html
+++ b/archives.ja.html
@@ -50,19 +50,19 @@ <h2>CotEditor non-AppStore版</h2>
 
 <p>CotEditorは<a href="https://itunes.apple.com/app/coteditor/id1024640650?ls=1" rel="external" title="CotEditor -Mac App Store">Mac App Store</a>で配布されていますが、直接ダウンロードできるnon-AppStore版も用意されています。</p>
 
-<a href="https://github.com/coteditor/CotEditor/releases/download/4.7.4/CotEditor_4.7.4.dmg"
-		download="CotEditor_4.7.4.dmg"
-		title="Download | CotEditor_4.7.4.dmg">
+<a href="https://github.com/coteditor/CotEditor/releases/download/4.8.0/CotEditor_4.8.0.dmg"
+		download="CotEditor_4.8.0.dmg"
+		title="Download | CotEditor_4.8.0.dmg">
 		<img src="./img/appicon/64@2x.png" width="64" alt=""/>
-		CotEditor <span>4.7.4</span>
+		CotEditor <span>4.8.0</span>
 </a>
 <dl>
 	<dt>リリース日</dt>
-	<dd><time>2024-02-11</time></dd>
+	<dd><time>2024-04-15</time></dd>
 
 	<dt>リリースノート</dt>
-	<dd><a href="releasenotes/4.7.4.en" hreflang="en">英語</a></dd>
-	<dd><a href="releasenotes/4.7.4.ja" hreflang="ja">日本語</a></dd>
+	<dd><a href="releasenotes/4.8.0.en" hreflang="en">英語</a></dd>
+	<dd><a href="releasenotes/4.8.0.ja" hreflang="ja">日本語</a></dd>
 
 	<dt>システム条件</dt>
 	<dd>macOS 13以降</dd>
diff --git a/archives.tr.html b/archives.tr.html
index adcaec2..3f26928 100644
--- a/archives.tr.html
+++ b/archives.tr.html
@@ -50,19 +50,19 @@ <h2>CotEditor AppStore olmayan sürüm</h2>
 
 <p>CotEditor, <a href="https://itunes.apple.com/app/coteditor/id1024640650?ls=1" rel="external" title="CotEditor -Mac App Store">Mac App Store</a>'da dağıtılır. Ancak, AppStore dışı dağıtılan bir sürüm de mevcuttur.</p>
 
-<a href="https://github.com/coteditor/CotEditor/releases/download/4.7.4/CotEditor_4.7.4.dmg"
-		download="CotEditor_4.7.4.dmg"
-		title="İndir | CotEditor_4.7.4.dmg">
+<a href="https://github.com/coteditor/CotEditor/releases/download/4.8.0/CotEditor_4.8.0.dmg"
+		download="CotEditor_4.8.0.dmg"
+		title="İndir | CotEditor_4.8.0.dmg">
 		<img src="./img/appicon/64@2x.png" width="64" alt=""/>
-		CotEditor <span>4.7.4</span>
+		CotEditor <span>4.8.0</span>
 </a>
 <dl>
 	<dt>yayımlama tarihi</dt>
-	<dd><time>2024-02-11</time></dd>
+	<dd><time>2024-04-15</time></dd>
 
 	<dt>sürüm notları</dt>
-	<dd><a href="releasenotes/4.7.4.en" hreflang="en">en</a></dd>
-	<dd><a href="releasenotes/4.7.4.ja" hreflang="ja">ja</a></dd>
+	<dd><a href="releasenotes/4.8.0.en" hreflang="en">en</a></dd>
+	<dd><a href="releasenotes/4.8.0.ja" hreflang="ja">ja</a></dd>
 
 	<dt>gereksinimler</dt>
 	<dd>macOS 13 veya sonrası</dd>
diff --git a/beta.html b/beta.html
index 2ef7e89..079d8d2 100644
--- a/beta.html
+++ b/beta.html
@@ -34,9 +34,9 @@ <h1>CotEditor <span>Beta</span></h1>
 </header>
 
 <main>
-<!--	<p>No beta version is currently available. Get the <a href="./">stable version</a>.</p>-->
+	<p>No beta version is currently available. Get the <a href="./">stable version</a>.</p>
 	
-	<p>This is a development version. Get the latest stable version on the <a href="https://itunes.apple.com/app/coteditor/id1024640650?ls=1">Mac App Store</a>.</p>
+<!--	<p>This is a development version. Get the latest stable version on the <a href="https://itunes.apple.com/app/coteditor/id1024640650?ls=1">Mac App Store</a>.</p>
 	<p>Before installing a beta version, you <strong>MUST</strong> read the release notes.</p>
 
 	<a href="https://github.com/coteditor/CotEditor/releases/download/4.8.0-rc/CotEditor_4.8.0-rc.dmg" class="download">
@@ -49,7 +49,7 @@ <h1>CotEditor <span>Beta</span></h1>
 		<li>release notes: <a href="releasenotes/4.8.0-beta.en" hreflang="en">en</a> | <a href="releasenotes/4.8.0-beta.ja" hreflang="ja">ja</a></li>
 	</ul>
 
-	<p id="issues">📃 <a href="https://github.com/coteditor/CotEditor/issues" title="Issues・coteditor/CotEditor">Report Bug</a></p>
+	<p id="issues">📃 <a href="https://github.com/coteditor/CotEditor/issues" title="Issues・coteditor/CotEditor">Report Bug</a></p>-->
 </main>
 
 
diff --git a/index.html b/index.html
index d430375..c699bd6 100644
--- a/index.html
+++ b/index.html
@@ -40,7 +40,7 @@
 
 <body>
 
-<a id="beta" href="beta">try <strong>beta</strong></a>
+<!--<a id="beta" href="beta">try <strong>beta</strong></a>-->
 
 <header>
 	<nav><ul>
diff --git a/index.ja.html b/index.ja.html
index 49f8b8c..755c8b7 100644
--- a/index.ja.html
+++ b/index.ja.html
@@ -36,7 +36,7 @@
 
 <body>
 
-<a id="beta" href="beta">try <strong>beta</strong></a>
+<!--<a id="beta" href="beta">try <strong>beta</strong></a>-->
 
 <header>
 	<nav><ul>
diff --git a/index.tr.html b/index.tr.html
index b881409..75a3d87 100644
--- a/index.tr.html
+++ b/index.tr.html
@@ -33,7 +33,7 @@
 
 <body>
 
-<a id="beta" href="beta"><strong>beta</strong> sürümü deneyin</a>
+<!--<a id="beta" href="beta"><strong>beta</strong> sürümü deneyin</a>-->
 
 <header>
 	<nav><ul>
diff --git a/releasenotes/4.8.0.en.html b/releasenotes/4.8.0.en.html
new file mode 100644
index 0000000..52800af
--- /dev/null
+++ b/releasenotes/4.8.0.en.html
@@ -0,0 +1,113 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head prefix="og: http://ogp.me/ns#">
+	<meta charset="UTF-8"/>
+
+	<title>What's new on CotEditor 4.8.0 - CotEditor</title>
+
+	<meta name="description"  content="What's new on CotEditor 4.8.0"/>
+
+	<meta property="og:type"         content="article"/>
+	<meta property="og:url"          content="https://coteditor.com/releasenotes/4.8.0.en"/>
+	<meta property="og:title"        content="CotEditor"/>
+	<meta property="og:description"  content="What's new on CotEditor 4.8.0"/>
+	<meta property="og:image"        content="https://coteditor.com/img/appicon/512@2x.png"/>
+	<meta property="og:site_name"    content="CotEditor"/>
+	<meta property="og:locale"       content="en_US"/>
+	<meta property="twitter:card"    content="summary"/>
+	<meta property="twitter:creator" content="@CotEditor"/>
+
+	<link rel="shortcut icon" href="/favicon.png"    type="image/png" sizes="16x16"/>
+	<link rel="shortcut icon" href="/favicon@2x.png" type="image/png" sizes="32x32"/>
+	<link rel="alternate"     href="4.8.0.ja" hreflang="ja"/>
+	<link rel="stylesheet"    href="../css/common.css"/>
+	<link rel="stylesheet"    href="../css/releasenotes.css"/>
+</head>
+
+<body>
+<header>
+	<a href="/">CotEditor</a>
+</header>
+
+<main>
+
+<section class="highlights">
+<h1>Highlights on CotEditor 4.8</h1>
+
+<dl>
+	<dt>Different behavior for different document</dt>
+	<dd>The concept of modes is introduced in CotEditor. Depending on the type of document, you can customize the font and typing behavior of the editor.</dd>
+	
+	<dt>Completely rewritten syntax editor</dt>
+	<dd>The functionality remains the same, but the syntax editor for the Format setting has been 100% rewritten in SwiftUI and looks a bit more modern.</dd>
+</dl>
+</section>
+
+
+
+<article>
+	<header>
+		<h1>CotEditor 4.8.0</h1>
+		<p>release: <time>2024-04-15</time></p>
+	</header>
+
+
+	<section>
+		<h2>New Features</h2>
+
+		<ul>
+			<li>Add the Mode feature that enables altering the editor’s behavior depending on the document’s syntax (Go Settings > Mode settings pane to set).</li>
+			<li>Add the Restore Defaults button to the File Drop settings.</li>
+			<li>Add Dutch localization (thanks to Yasin Gunaydin!).</li>
+		</ul>
+	</section>
+
+
+	<section>
+		<h2>Improvements</h2>
+
+		<ul>
+			<li>Improve the look and feel of the syntax editor.</li>
+			<li>Renew the “About CotEditor” window.</li>
+			<li>Change the line count behavior to ignore the new line character at the end of the last line.</li>
+			<li>Improve selected line number emphasis in the line number view by the vertical text orientation.</li>
+			<li>Change the filter field for the outline inspector to apply the selection of the filter history immediately.</li>
+			<li>Make the encoding priority view undoable.</li>
+			<li>Disable the pane transition animation in the Settings window when the user sets to reduce motion in the system Accessibility settings.</li>
+			<li>Deprecate “Append a space to comment delimiter” option.</li>
+			<li>Remove wrapped line marks in the line number view.</li>
+			<li>Update the Makefile syntax to add “GNUmakefile” to the filename mapping.</li>
+			<li><span class="label">non-AppStore ver.</span>: Update Sparkle from 2.5.2 to 2.6.0.</li>
+			<li><span class="trivial">trivial</span>: Enable delete selected separators in the encoding priority view with the Delete key.</li>
+			<li><span class="trivial">trivial</span>: Avoid users using reserved syntax names.</li>
+			<li><span class="trivial">trivial</span>: Remove the dialog urging to restart the application by changing the “Reopen windows from last session” option in the General settings pane.</li>
+			<li><span class="trivial">dev</span>: Migrate the settings window, syntax editor, and status bar to SwiftUI.</li>
+			<li><span class="trivial">dev</span>: Migrate all localizable strings to String Catalog.</li>
+			<li><span class="trivial">dev</span>: Update the build environment to Xcode 15.3 (Swift 5.10).</li>
+			<li><span class="trivial">dev</span>: Update Yams from 5.0.6 to 5.1.2.</li>
+		</ul>
+	</section>
+
+
+	<section>
+		<h2>Fixes</h2>
+
+		<ul>
+			<li>Fix an issue that the application crashed when trying to share a custom syntax.</li>
+			<li>Fix an issue on the filter field for the outline inspector that the filter history was initially empty.</li>
+			<li>Fix an issue on macOS 14 that multiple cursors in editors remained when they are inactive.</li>
+			<li>Fix missing localizations.</li>
+		</ul>
+	</section>
+
+<p><a href="4.7.4.en">previous release notes</a></p>
+</article>
+</main>
+
+
+<footer>
+	<p class="copyright">© 2024 CotEditor Project</p>
+</footer>
+</body>
+</html>
diff --git a/releasenotes/4.8.0.ja.html b/releasenotes/4.8.0.ja.html
new file mode 100644
index 0000000..b8b6c53
--- /dev/null
+++ b/releasenotes/4.8.0.ja.html
@@ -0,0 +1,113 @@
+<!DOCTYPE html>
+<html lang="ja">
+
+<head prefix="og: http://ogp.me/ns#">
+	<meta charset="UTF-8"/>
+
+	<title>CotEditor 4.8.0の変更点 - CotEditor</title>
+
+	<meta name="description"  content="CotEditor 4.8.0の変更点"/>
+
+	<meta property="og:type"         content="article"/>
+	<meta property="og:url"          content="https://coteditor.com/releasenotes/4.8.0.ja"/>
+	<meta property="og:title"        content="CotEditor"/>
+	<meta property="og:description"  content="CotEditor 4.8.0の変更点"/>
+	<meta property="og:image"        content="https://coteditor.com/img/appicon/512@2x.png"/>
+	<meta property="og:site_name"    content="CotEditor"/>
+	<meta property="og:locale"       content="ja_JP"/>
+	<meta property="twitter:card"    content="summary"/>
+	<meta property="twitter:creator" content="@CotEditor"/>
+
+	<link rel="shortcut icon" href="/favicon.png"    type="image/png" sizes="16x16"/>
+	<link rel="shortcut icon" href="/favicon@2x.png" type="image/png" sizes="32x32"/>
+	<link rel="alternate"     href="4.8.0.en" hreflang="en"/>
+	<link rel="stylesheet"    href="../css/common.css"/>
+	<link rel="stylesheet"    href="../css/releasenotes.css"/>
+</head>
+
+<body>
+<header>
+	<a href="/">CotEditor</a>
+</header>
+
+<main>
+
+<section class="highlights">
+<h1>CotEditor 4.8のハイライト</h1>
+
+<dl>
+	<dt>それぞれの書類にそれぞれの振る舞い</dt>
+	<dd>CotEditorにモードという概念が取り入れられました。書類のタイプに合わせて、エディタのフォントや入力時の振る舞いを使い分けることができます。</dd>
+	
+	<dt>新しく書き直されたシンタックスエディタ</dt>
+	<dd>機能は変わらないですが、「フォーマット」設定のシンタックスエディタが100% SwiftUIで書き直され、見た目もちょっとモダンになりました。</dd>
+</dl>
+</section>
+
+
+
+<article>
+	<header>
+		<h1>CotEditor 4.8.0</h1>
+		<p>リリース: <time>2024-04-15</time></p>
+	</header>
+
+
+	<section>
+		<h2>新機能</h2>
+
+		<ul>
+			<li>書類のシンタックスに応じてエディタの振る舞いを変更できるモード機能を追加（設定 &gt; 「モード」設定ペインで設定）</li>
+			<li>ファイルドロップ設定に「デフォルトに戻す」ボタンを追加</li>
+			<li>オランダ語ローカリゼーションを追加（Yasin Gunaydinさんに感謝!）</li>
+		</ul>
+	</section>
+
+
+	<section>
+		<h2>改良</h2>
+
+		<ul>
+			<li>シンタックスエディタの見た目を刷新</li>
+			<li>「CotEditorについて」ウインドウを刷新</li>
+			<li>行カウントで最後の改行コードをカウントしないように変更</li>
+			<li>縦書きのときの行番号ビューの選択行強調を改良</li>
+			<li>アウトラインインスペクタのフィルタ履歴の選択をすぐフィルタに反映するように変更</li>
+			<li>エンコーディング優先度編集でアンドゥ/リドゥを可能に</li>
+			<li>ユーザがシステムのアクセシビリティ設定で視差効果を減らしている場合は、設定ウインドウのペイン切り替えアニメーションを無効に</li>
+			<li>「コメント記号にスペースを追加」オプションを廃止</li>
+			<li>行番号ビューの行折り返しマークを削除</li>
+			<li>Makefileシンタックスを更新し「GNUmakefile」をファイル名マッピングに追加</li>
+			<li><span class="label">非AppStore版</span>: Sparkleを2.5.2から2.6.0に更新</li>
+			<li><span class="trivial">trivial</span>: Deleteキーで選択した区切り線を削除できるようにエンコーディング優先度編集を改良</li>
+			<li><span class="trivial">trivial</span>: 予約されたシンタックス名をユーザが使用することを防止</li>
+			<li><span class="trivial">trivial</span>: 一般設定の「最後のセッションのウインドウを開く」オプションを変更したときに表示されていたアプリケーションの再起動を促すダイアログを削除</li>
+			<li><span class="trivial">開発</span>: 設定ウインドウとシンタックスエディタ、ステータスバーを全面的にSwiftUIに移行</li>
+			<li><span class="trivial">開発</span>: すべてのローカリゼーション文字列管理をString Catalogに移行</li>
+			<li><span class="trivial">開発</span>: ビルド環境をXcode 15.3（Swift 5.10）に更新</li>
+			<li><span class="trivial">開発</span>: Yamsを5.0.6から5.1.2に更新</li>
+		</ul>
+	</section>
+
+
+	<section>
+		<h2>修正</h2>
+
+		<ul>
+			<li>カスタムシンタックスを共有しようとするとアプリケーションがクラッシュする不具合を修正</li>
+			<li>初期表示時の履歴メニューが空だったアウトラインインスペクタのフィルタ欄の不具合を修正</li>
+			<li>マルチカーソルのカーソル描画がエディタがアクティブでないときも残ることがあるmacOS 14の不具合を修正</li>
+			<li>ローカライズされていなかったテキストを修正</li>
+		</ul>
+	</section>
+
+	<p><a href="4.7.4.ja">以前のリリースノート</a></p>
+</article>
+</main>
+
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