diff --git a/adventskalender/2025/index.html b/adventskalender/2025/index.html
index 90ed8da..502725c 100644
--- a/adventskalender/2025/index.html
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@@ -19,7 +19,7 @@
     <h1>Bratonien Adventskalender 2025</h1>
 
     <div class="kalenderbild">
-  <img src="assets/images/Basisbild.png" alt="Bratonien Adventskalender 2025">
+  <img src="assets/images/Basisbild.webp" alt="Bratonien Adventskalender 2025">
     <div class="door hinge-right" data-day="18" data-left="6" data-top="9" data-width="8.5">18</div>
     <div class="openfield" data-day="18" data-left="6" data-top="9" data-width="8.5"></div>