diff --git a/adventskalender/2025/js/background.js b/adventskalender/2025/js/background.js
index 2b979f7..ea40a72 100644
--- a/adventskalender/2025/js/background.js
+++ b/adventskalender/2025/js/background.js
@@ -50,7 +50,7 @@
 
     if (!picture || !img || !sources) return;
 
-    const breakpoints = [420, 768, 1024, 1280, 1600, 1920, 2560, 3840];
+    const breakpoints = [420, 768, 1024, 1366, 1600, 1920, 2560, 3840];
 
     // === <source> für AVIF und WebP aktualisieren ===
     sources.forEach(source => {