diff --git a/public/app.js b/public/app.js
index 0b8a7a8..b578f8a 100644
--- a/public/app.js
+++ b/public/app.js
@@ -9,6 +9,7 @@ const dialogArtist = document.getElementById('dialogArtist');
 const trackList = document.getElementById('trackList');
 const sendBtn = document.getElementById('sendBtn');
 const cleanupToggle = document.getElementById('cleanupToggle');
+const updateLibraryBtn = document.getElementById('updateLibraryBtn');
 
 let selectedAlbum = null;
 
@@ -221,6 +222,23 @@ async function sendToLidarr(event) {
   }
 }
 
+async function updateLibrary() {
+  setStatus('Starte Lidarr Bibliothek-Update...');
+  updateLibraryBtn.disabled = true;
+
+  try {
+    const data = await fetchJson('/api/lidarr/update-library', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' }
+    });
+    setStatus(`Bibliothek-Update gestartet (${data.commandNames.join(', ')}).`);
+  } catch (err) {
+    setStatus(`Fehler beim Bibliothek-Update: ${err.message}`, true);
+  } finally {
+    updateLibraryBtn.disabled = false;
+  }
+}
+
 searchBtn.addEventListener('click', searchSpotify);
 queryInput.addEventListener('keydown', (event) => {
   if (event.key === 'Enter') {
@@ -228,3 +246,4 @@ queryInput.addEventListener('keydown', (event) => {
   }
 });
 sendBtn.addEventListener('click', sendToLidarr);
+updateLibraryBtn.addEventListener('click', updateLibrary);
diff --git a/public/index.html b/public/index.html
index 3ae6469..64c8cf9 100644
--- a/public/index.html
+++ b/public/index.html
@@ -22,6 +22,9 @@
           <input type="checkbox" id="cleanupToggle" />
           <span>Ueberfluessige Dateien nach Download loeschen</span>
         </label>
+        <div style="margin-top: 0.8rem;">
+          <button id="updateLibraryBtn" type="button">Lidarr Bibliothek updaten</button>
+        </div>
         <p class="hint">
           Wenn nur einzelne Songs gewaehlt sind, versucht die App unnoetige Track-Dateien in Lidarr zu entfernen.
         </p>
diff --git a/server.js b/server.js
index e10800f..e6356a3 100644
--- a/server.js
+++ b/server.js
@@ -176,6 +176,30 @@ async function triggerAlbumSearch(albumId) {
   });
 }
 
+async function triggerLibraryUpdate() {
+  const started = [];
+
+  try {
+    await lidarrRequest('post', '/api/v1/command', { name: 'RescanFolders' });
+    started.push('RescanFolders');
+  } catch (err) {
+    console.warn('RescanFolders konnte nicht gestartet werden:', err.message);
+  }
+
+  try {
+    await lidarrRequest('post', '/api/v1/command', { name: 'RefreshArtist' });
+    started.push('RefreshArtist');
+  } catch (err) {
+    console.warn('RefreshArtist konnte nicht gestartet werden:', err.message);
+  }
+
+  if (started.length === 0) {
+    throw new Error('Kein Bibliothek-Update-Kommando konnte in Lidarr gestartet werden.');
+  }
+
+  return started;
+}
+
 async function cleanupUnselectedTrackFiles(albumId, selectedTrackIds) {
   const allFiles = await fetchTrackFiles(albumId);
   if (!Array.isArray(allFiles) || allFiles.length === 0) {
@@ -416,6 +440,17 @@ app.post('/api/lidarr/send-album', async (req, res) => {
   }
 });
 
+app.post('/api/lidarr/update-library', async (_req, res) => {
+  try {
+    const commandNames = await triggerLibraryUpdate();
+    res.json({ success: true, commandNames });
+  } catch (err) {
+    const status = err.response?.status || 500;
+    const details = err.response?.data || err.message;
+    res.status(status).json({ error: typeof details === 'string' ? details : JSON.stringify(details) });
+  }
+});
+
 app.get('*', (_req, res) => {
   res.sendFile(path.join(__dirname, 'public', 'index.html'));
 });