diff --git a/backend/routes/admin.py b/backend/routes/admin.py
index facd4d2..141b82d 100644
--- a/backend/routes/admin.py
+++ b/backend/routes/admin.py
@@ -569,6 +569,18 @@ async def system_info(user=Depends(require_admin)):
     except (OSError, AttributeError):
         pass
 
+    # SW-Cache-Version aus sw.js lesen
+    sw_version = "?"
+    try:
+        import re as _re
+        static_dir = os.getenv("STATIC_DIR", "/app/static")
+        sw_content = open(os.path.join(static_dir, "sw.js")).readline()
+        m = _re.search(r"'(by-v\d+)'", sw_content)
+        if m:
+            sw_version = m.group(1)
+    except Exception:
+        pass
+
     return {
         "db_size_mb":     round(db_size_mb, 2),
         "media_size_mb":  round(media_size_mb, 2),
@@ -576,6 +588,7 @@ async def system_info(user=Depends(require_admin)):
         "python_version": sys.version.split()[0],
         "disk_total_gb":  round(disk_total_gb, 2),
         "disk_free_gb":   round(disk_free_gb, 2),
+        "sw_version":     sw_version,
     }
 
 
diff --git a/backend/static/js/app.js b/backend/static/js/app.js
index 187591e..d053796 100644
--- a/backend/static/js/app.js
+++ b/backend/static/js/app.js
@@ -3,7 +3,7 @@
    Router, State-Management, Navigation, Initialisierung.
    ============================================================ */
 
-const APP_VER = '417'; // ← bei jedem Deploy mit Frontend-Änderungen erhöhen
+const APP_VER = '418'; // ← bei jedem Deploy mit Frontend-Änderungen erhöhen
 
 const App = (() => {
 
diff --git a/backend/static/js/pages/admin.js b/backend/static/js/pages/admin.js
index 3d74055..a9c68c5 100644
--- a/backend/static/js/pages/admin.js
+++ b/backend/static/js/pages/admin.js
@@ -1064,8 +1064,11 @@ window.Page_admin = (() => {
             ${diskPct}% · ${diskUsedGb.toFixed(1)} / ${s.disk_total_gb.toFixed(1)} GB
           </div>
         </div>
-        <div style="margin-top:var(--space-3);font-size:var(--text-xs);color:var(--c-text-muted)">
-          Python ${_esc(s.python_version)}
+        <div style="margin-top:var(--space-3);font-size:var(--text-xs);color:var(--c-text-muted);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:4px">
+          <span>Python ${_esc(s.python_version)}</span>
+          <span style="font-family:monospace;font-size:var(--text-xs);background:var(--c-surface-2);padding:2px 8px;border-radius:4px;color:var(--c-text-secondary)">
+            APP v${typeof APP_VER !== 'undefined' ? APP_VER : '—'} · ${_esc(s.sw_version || '?')}
+          </span>
         </div>
       </div>
     `;
diff --git a/backend/static/sw.js b/backend/static/sw.js
index 125a592..06c2a1e 100644
--- a/backend/static/sw.js
+++ b/backend/static/sw.js
@@ -3,7 +3,7 @@
    Offline-Cache + Push Notifications + Tile-Cache
    ============================================================ */
 
-const CACHE_VERSION = 'by-v438';
+const CACHE_VERSION = 'by-v439';
 const CACHE_STATIC  = `${CACHE_VERSION}-static`;
 const CACHE_TILES   = 'ban-yaro-tiles-v1';  // bleibt über SW-Updates erhalten