diff --git a/renderer/styles.css b/renderer/styles.css
index 29dd459..953505c 100644
--- a/renderer/styles.css
+++ b/renderer/styles.css
@@ -2381,7 +2381,7 @@ select.hs-input { max-width: none; width: auto; min-width: 140px; }
 }
 
 .update-dialog {
-  width: min(480px, 100%);
+  width: min(576px, 100%);
   display: grid;
   grid-template-columns: 48px minmax(0, 1fr);
   gap: 0 16px;
@@ -2468,7 +2468,7 @@ select.hs-input { max-width: none; width: auto; min-width: 140px; }
 
 .update-release-notes {
   grid-column: 1 / -1;
-  max-height: 150px;
+  max-height: 180px;
   margin-top: 18px;
   padding: 12px;
   overflow: auto;
diff --git a/tests/startup-renderer.test.js b/tests/startup-renderer.test.js
index 040a477..500c6a4 100644
--- a/tests/startup-renderer.test.js
+++ b/tests/startup-renderer.test.js
@@ -174,4 +174,6 @@ test('header occupies its final geometry before asynchronous initialization', ()
   assert.match(css, /\.upload-speed-baseline\s*\{[^}]*background:\s*var\(--success\);/su);
   assert.match(css, /\.header-update-button\.update-available\s*\{[^}]*background:\s*var\(--success\);[^}]*color:\s*#000;/su);
   assert.match(css, /\.header-update-button\.update-available:hover\s*\{[^}]*background:\s*var\(--success-end\);[^}]*color:\s*#000;/su);
+  assert.match(css, /\.update-dialog\s*\{[^}]*width:\s*min\(576px,\s*100%\);/su);
+  assert.match(css, /\.update-release-notes\s*\{[^}]*max-height:\s*180px;/su);
 });
diff --git a/tests/ui-smoke.js b/tests/ui-smoke.js
index 278d6aa..1794ea7 100644
--- a/tests/ui-smoke.js
+++ b/tests/ui-smoke.js
@@ -2449,6 +2449,8 @@ setTimeout(async () => {
     check('Update dialog exposes a red close action', updateCloseColor === 'rgb(255, 133, 140)');
     const updateDialogChangelog = await wc.executeJavaScript('(() => { const title = document.querySelector(".update-release-notes-title"); const body = document.getElementById("updateReleaseNotesBody"); const titleRect = title?.getBoundingClientRect(); const bodyRect = body?.getBoundingClientRect(); return { hidden: document.getElementById("updateReleaseNotes")?.hidden, title: title?.textContent?.trim(), body: body?.textContent, gap: bodyRect && titleRect ? bodyRect.top - titleRect.bottom : null }; })()');
     check('Update dialog renders a compact normalized changelog', updateDialogChangelog.hidden === false && updateDialogChangelog.title === 'Changelog' && updateDialogChangelog.body === 'New in this version\\n\\nMenus and navigation\\n\\n• Added live language switching.\\n• Improved settings layout.' && updateDialogChangelog.gap <= 10);
+    const updateDialogSize = await wc.executeJavaScript('(() => ({ width: document.querySelector(".update-dialog")?.getBoundingClientRect().width, notesMaxHeight: getComputedStyle(document.getElementById("updateReleaseNotes")).maxHeight }))()');
+    check('Update dialog and changelog provide twenty percent more room', updateDialogSize.width === 576 && updateDialogSize.notesMaxHeight === '180px');
 
     const updateHeaderHint = await wc.executeJavaScript('(() => { const button = document.getElementById("headerUpdateBtn"); const tooltip = getComputedStyle(button, "::after"); return [button?.textContent?.trim(), button?.getAttribute("aria-label"), button?.dataset.tooltip, button?.hasAttribute("title"), tooltip.left, tooltip.right].join("|"); })()');
     check('Available update uses one centered custom tooltip below the header action', updateHeaderHint === 'Update verfügbar|Update v9.9.9 verfügbar. Klicken zum Installieren.|Update v9.9.9 verfügbar. Klicken zum Installieren.|false|73px|auto');