diff --git a/src/static/dashboard.html b/src/static/dashboard.html
index 6f5defe..70c9cee 100644
--- a/src/static/dashboard.html
+++ b/src/static/dashboard.html
@@ -717,5 +717,6 @@
         </div>
     </div>
 
+    <script src="/static/js/update-system.js"></script>
 </body>
 </html>
diff --git a/src/static/js/update-system.js b/src/static/js/update-system.js
new file mode 100644
index 0000000..cb9dd7f
--- /dev/null
+++ b/src/static/js/update-system.js
@@ -0,0 +1,263 @@
+/**
+ * Update-System fuer den AegisSight Monitor.
+ *
+ * Zeigt zwei Dinge:
+ *   1) Beim ersten Page-Load nach einem Update -> Modal "Was ist neu?"
+ *      mit den Eintraegen aus RELEASES.json, die der User noch nicht gesehen hat.
+ *
+ *   2) Wenn der User die Seite offen hat und im Hintergrund ein neues Update
+ *      live geht -> kleiner Banner unten rechts:
+ *      "Eine neue Version ist verfuegbar. [Jetzt aktualisieren]"
+ *
+ * Datenquellen (Backend):
+ *   GET /api/version       -> { commit, deployed_at }
+ *   GET /api/release-notes -> { entries: [...], current }
+ *
+ * Persistenz im Browser:
+ *   localStorage 'aegis_last_seen_release' -> "version"-Feld des zuletzt
+ *                                              gesehenen Eintrags
+ */
+(function () {
+    'use strict';
+
+    const POLL_INTERVAL_MS = 60_000;          // alle 60 Sekunden
+    const STORAGE_KEY = 'aegis_last_seen_release';
+
+    let initialBootCommit = null;             // Commit-Hash beim Page-Load
+    let pollTimer = null;
+    let updateBannerShown = false;
+
+    // ---- Mini-DOM-Helpers ----
+    function el(tag, attrs, ...children) {
+        const e = document.createElement(tag);
+        for (const k in (attrs || {})) {
+            if (k === 'class') e.className = attrs[k];
+            else if (k === 'html') e.innerHTML = attrs[k];
+            else if (k.startsWith('on')) e.addEventListener(k.slice(2), attrs[k]);
+            else e.setAttribute(k, attrs[k]);
+        }
+        for (const c of children) {
+            if (c == null) continue;
+            e.appendChild(typeof c === 'string' ? document.createTextNode(c) : c);
+        }
+        return e;
+    }
+
+    // ---- Styles inline injecten (kein zusaetzlicher CSS-File noetig) ----
+    function injectStyles() {
+        if (document.getElementById('aegis-update-styles')) return;
+        const css = `
+        #aegis-update-banner {
+            position: fixed; bottom: 24px; right: 24px; z-index: 99999;
+            background: linear-gradient(135deg, #C8A851, #D4B96A);
+            color: #0A1832; padding: 14px 18px; border-radius: 10px;
+            box-shadow: 0 8px 32px rgba(10,24,50,0.4);
+            font-family: 'Inter', -apple-system, sans-serif; font-size: 0.92rem;
+            display: flex; align-items: center; gap: 12px; max-width: 380px;
+            animation: aegis-slide-in 0.4s cubic-bezier(0.4,0,0.2,1);
+        }
+        @keyframes aegis-slide-in {
+            from { transform: translateX(420px); opacity: 0; }
+            to   { transform: translateX(0);     opacity: 1; }
+        }
+        #aegis-update-banner b { font-weight: 700; }
+        #aegis-update-banner button {
+            background: #0A1832; color: #C8A851; border: 0; padding: 7px 14px;
+            border-radius: 6px; font: inherit; font-size: 0.86rem; font-weight: 600;
+            cursor: pointer; flex-shrink: 0;
+        }
+        #aegis-update-banner button:hover { background: #132844; }
+        #aegis-update-banner .close {
+            background: transparent; color: #0A1832; opacity: 0.6; padding: 0 4px;
+            font-size: 1.2rem; line-height: 1;
+        }
+        #aegis-update-banner .close:hover { opacity: 1; background: transparent; }
+
+        #aegis-update-modal-overlay {
+            position: fixed; inset: 0; background: rgba(10,24,50,0.75); z-index: 99998;
+            backdrop-filter: blur(3px);
+            display: flex; align-items: center; justify-content: center; padding: 24px;
+            animation: aegis-fade-in 0.25s ease;
+        }
+        @keyframes aegis-fade-in { from { opacity: 0; } to { opacity: 1; } }
+        #aegis-update-modal {
+            background: #132844; color: #E8E8E8; border-radius: 14px;
+            border: 1px solid rgba(200,168,81,0.25);
+            box-shadow: 0 24px 80px rgba(0,0,0,0.5);
+            font-family: 'Inter', -apple-system, sans-serif;
+            max-width: 540px; width: 100%; max-height: 80vh; overflow: hidden;
+            display: flex; flex-direction: column;
+        }
+        #aegis-update-modal header {
+            padding: 22px 28px 18px; border-bottom: 1px solid rgba(200,168,81,0.15);
+        }
+        #aegis-update-modal h2 { margin: 0 0 4px; color: #C8A851; font-size: 1.25rem; font-weight: 700; }
+        #aegis-update-modal header p { margin: 0; color: #A0A8B8; font-size: 0.88rem; }
+        #aegis-update-modal .body { padding: 8px 28px; overflow-y: auto; }
+        .aegis-release { padding: 16px 0; border-bottom: 1px solid rgba(255,255,255,0.06); }
+        .aegis-release:last-child { border: 0; }
+        .aegis-release-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 8px; }
+        .aegis-release-title { font-size: 1rem; font-weight: 600; color: #E8E8E8; }
+        .aegis-release-date { font-size: 0.78rem; color: #5A6478; }
+        .aegis-release-items { margin: 0; padding-left: 20px; color: #C0C8D8; font-size: 0.92rem; line-height: 1.6; }
+        .aegis-release-items li { margin-bottom: 4px; }
+        #aegis-update-modal footer {
+            padding: 16px 28px 20px; border-top: 1px solid rgba(200,168,81,0.15);
+            display: flex; justify-content: flex-end;
+        }
+        #aegis-update-modal footer button {
+            background: #C8A851; color: #0A1832; border: 0; padding: 10px 22px;
+            border-radius: 6px; font: inherit; font-size: 0.92rem; font-weight: 600;
+            cursor: pointer;
+        }
+        #aegis-update-modal footer button:hover { background: #D4B96A; }
+
+        @media (max-width: 600px) {
+            #aegis-update-banner { left: 12px; right: 12px; bottom: 12px; max-width: none; }
+        }`;
+        document.head.appendChild(el('style', { id: 'aegis-update-styles', html: css }));
+    }
+
+    // ---- Backend-Kommunikation ----
+    async function fetchVersion() {
+        try {
+            const r = await fetch('/api/version', { cache: 'no-store' });
+            if (!r.ok) return null;
+            return await r.json();
+        } catch (e) {
+            return null;
+        }
+    }
+
+    async function fetchReleaseNotes(since) {
+        try {
+            const url = '/api/release-notes' + (since ? '?since=' + encodeURIComponent(since) : '');
+            const r = await fetch(url, { cache: 'no-store' });
+            if (!r.ok) return null;
+            return await r.json();
+        } catch (e) {
+            return null;
+        }
+    }
+
+    // ---- Banner ----
+    function showUpdateBanner() {
+        if (updateBannerShown) return;
+        if (document.getElementById('aegis-update-banner')) return;
+        updateBannerShown = true;
+
+        const banner = el('div', { id: 'aegis-update-banner' },
+            el('div', null,
+                el('b', null, 'Update verfügbar'),
+                document.createElement('br'),
+                el('span', { style: 'font-size:0.85rem;opacity:0.85' },
+                    'Eine neue Version ist live. Bitte Seite neu laden, um sie zu nutzen.')
+            ),
+            el('button', { onclick: () => location.reload() }, 'Aktualisieren'),
+            el('button', {
+                class: 'close', title: 'Schließen',
+                onclick: () => banner.remove()
+            }, '×')
+        );
+        document.body.appendChild(banner);
+    }
+
+    // ---- Modal ----
+    function showWhatsNewModal(entries, currentVersion) {
+        if (document.getElementById('aegis-update-modal-overlay')) return;
+        if (!entries || !entries.length) return;
+
+        const releases = entries.map(e => {
+            const items = (e.items || []).map(i => el('li', null, i));
+            return el('div', { class: 'aegis-release' },
+                el('div', { class: 'aegis-release-head' },
+                    el('span', { class: 'aegis-release-title' }, e.title || 'Update'),
+                    el('span', { class: 'aegis-release-date' }, e.date || '')
+                ),
+                items.length ? el('ul', { class: 'aegis-release-items' }, ...items) : null
+            );
+        });
+
+        const overlay = el('div', { id: 'aegis-update-modal-overlay' },
+            el('div', { id: 'aegis-update-modal' },
+                el('header', null,
+                    el('h2', null, 'Was ist neu?'),
+                    el('p', null, 'Diese Änderungen sind seit deinem letzten Besuch dazugekommen.')
+                ),
+                el('div', { class: 'body' }, ...releases),
+                el('footer', null,
+                    el('button', {
+                        onclick: () => {
+                            // Hoechste (= neueste) Version als gesehen markieren
+                            const newest = entries[0]?.version;
+                            if (newest) localStorage.setItem(STORAGE_KEY, newest);
+                            overlay.remove();
+                        }
+                    }, 'Verstanden')
+                )
+            )
+        );
+
+        // ESC oder Klick auf Hintergrund -> wie "Verstanden"
+        overlay.addEventListener('click', (ev) => {
+            if (ev.target === overlay) {
+                const newest = entries[0]?.version;
+                if (newest) localStorage.setItem(STORAGE_KEY, newest);
+                overlay.remove();
+            }
+        });
+        document.addEventListener('keydown', function escHandler(ev) {
+            if (ev.key === 'Escape' && document.getElementById('aegis-update-modal-overlay')) {
+                const newest = entries[0]?.version;
+                if (newest) localStorage.setItem(STORAGE_KEY, newest);
+                overlay.remove();
+                document.removeEventListener('keydown', escHandler);
+            }
+        });
+
+        document.body.appendChild(overlay);
+    }
+
+    // ---- Polling ----
+    async function pollVersion() {
+        const v = await fetchVersion();
+        if (v && v.commit && initialBootCommit && v.commit !== initialBootCommit) {
+            showUpdateBanner();
+            // Polling beenden, sobald Banner gezeigt
+            if (pollTimer) { clearInterval(pollTimer); pollTimer = null; }
+        }
+    }
+
+    // ---- Initial-Boot ----
+    async function init() {
+        injectStyles();
+
+        const v = await fetchVersion();
+        if (v && v.commit) initialBootCommit = v.commit;
+
+        // Was-ist-neu-Modal: nur wenn Eintraege NEUER als 'lastSeen' existieren
+        const lastSeen = localStorage.getItem(STORAGE_KEY);
+        const notes = await fetchReleaseNotes(lastSeen);
+        if (notes && notes.entries && notes.entries.length > 0) {
+            // Wenn lastSeen leer ist (erster Besuch ueberhaupt), kein Modal,
+            // sondern nur den aktuellen Stand als "gesehen" markieren.
+            if (!lastSeen) {
+                if (notes.entries[0]?.version) {
+                    localStorage.setItem(STORAGE_KEY, notes.entries[0].version);
+                }
+            } else {
+                // mit etwas Verzoegerung, damit das Dashboard erst rendert
+                setTimeout(() => showWhatsNewModal(notes.entries, v?.commit), 800);
+            }
+        }
+
+        // Polling starten
+        pollTimer = setInterval(pollVersion, POLL_INTERVAL_MS);
+    }
+
+    if (document.readyState === 'loading') {
+        document.addEventListener('DOMContentLoaded', init);
+    } else {
+        init();
+    }
+})();