diff --git a/ernaehrung.html b/ernaehrung.html
index 81e9f63..78428fc 100644
--- a/ernaehrung.html
+++ b/ernaehrung.html
@@ -10,7 +10,7 @@
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Questrial&display=swap" rel="stylesheet">
-  <link rel="stylesheet" href="assets/site.css">
+  <link rel="stylesheet" href="assets/site.css?v=c9d7b72e">
 </head>
 <body>
   <header class="site-header">
@@ -101,6 +101,6 @@
       <div class="footer-meta"><span>© 2026 Schmacko Napf &amp; Hundetraining by Katha</span><span>Fotos: Steffi Biller, KK-Fotografie</span></div>
     </footer>
   </main>
-  <script src="assets/site.js"></script>
+  <script src="assets/site.js?v=4a2c8d49"></script>
 </body>
 </html>
diff --git a/hundeschule.html b/hundeschule.html
index bbfa12c..f974579 100644
--- a/hundeschule.html
+++ b/hundeschule.html
@@ -10,7 +10,7 @@
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Questrial&display=swap" rel="stylesheet">
-  <link rel="stylesheet" href="assets/site.css">
+  <link rel="stylesheet" href="assets/site.css?v=c9d7b72e">
 </head>
 <body>
   <header class="site-header">
@@ -104,6 +104,6 @@
       <div class="footer-meta"><span>© 2026 Schmacko Napf &amp; Hundetraining by Katha</span><span>Fotos: Steffi Biller, KK-Fotografie</span></div>
     </footer>
   </main>
-  <script src="assets/site.js"></script>
+  <script src="assets/site.js?v=4a2c8d49"></script>
 </body>
 </html>
diff --git a/impressum.html b/impressum.html
index bf628a9..b134713 100644
--- a/impressum.html
+++ b/impressum.html
@@ -10,7 +10,7 @@
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Questrial&display=swap" rel="stylesheet">
-  <link rel="stylesheet" href="assets/site.css">
+  <link rel="stylesheet" href="assets/site.css?v=c9d7b72e">
 </head>
 <body>
   <header class="site-header">
@@ -53,6 +53,6 @@
       <div class="footer-meta"><span>© 2026 Schmacko Napf &amp; Hundetraining by Katha</span><span>Fotos: Steffi Biller, KK-Fotografie</span></div>
     </footer>
   </main>
-  <script src="assets/site.js"></script>
+  <script src="assets/site.js?v=4a2c8d49"></script>
 </body>
 </html>
diff --git a/index.html b/index.html
index 8591a50..32589ab 100644
--- a/index.html
+++ b/index.html
@@ -10,7 +10,7 @@
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Questrial&display=swap" rel="stylesheet">
-  <link rel="stylesheet" href="assets/site.css">
+  <link rel="stylesheet" href="assets/site.css?v=c9d7b72e">
 </head>
 <body class="is-home">
   <header class="site-header">
@@ -159,6 +159,6 @@
       <div class="footer-meta"><span>© 2026 Schmacko Napf &amp; Hundetraining by Katha</span><span>Fotos: Steffi Biller, KK-Fotografie</span></div>
     </footer>
   </main>
-  <script src="assets/site.js"></script>
+  <script src="assets/site.js?v=4a2c8d49"></script>
 </body>
 </html>
diff --git a/shop.html b/shop.html
index fcdcb13..38d7f1b 100644
--- a/shop.html
+++ b/shop.html
@@ -10,7 +10,7 @@
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Questrial&display=swap" rel="stylesheet">
-  <link rel="stylesheet" href="assets/site.css">
+  <link rel="stylesheet" href="assets/site.css?v=c9d7b72e">
 </head>
 <body>
   <header class="site-header">
@@ -72,6 +72,6 @@
       <div class="footer-meta"><span>© 2026 Schmacko Napf &amp; Hundetraining by Katha</span><span>Fotos: Steffi Biller, KK-Fotografie</span></div>
     </footer>
   </main>
-  <script src="assets/site.js"></script>
+  <script src="assets/site.js?v=4a2c8d49"></script>
 </body>
 </html>
diff --git a/tools/build_pages.py b/tools/build_pages.py
index dd9241b..4b797b2 100644
--- a/tools/build_pages.py
+++ b/tools/build_pages.py
@@ -1,6 +1,11 @@
-import os
+import hashlib, os
 OUT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 
+def version(path):
+    # Prüfsumme als ?v=… – Browser laden CSS/JS nach jeder Änderung neu statt aus dem Cache
+    return hashlib.md5(open(os.path.join(OUT, path), "rb").read()).hexdigest()[:8]
+CSS_V, JS_V = version("assets/site.css"), version("assets/site.js")
+
 WP = "https://schmacko-napf.de/wp-content/uploads/"
 LOGO = WP + "2024/12/Logo-Transparent-Rechnung.png"
 KK = {n: f"{WP}2025/01/KK-Fotografie-{n}.jpg" for n in (35, 46, 51, 66)}
@@ -48,7 +53,7 @@ def head(title, desc):
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Questrial&display=swap" rel="stylesheet">
-  <link rel="stylesheet" href="assets/site.css">
+  <link rel="stylesheet" href="assets/site.css?v={CSS_V}">
 </head>
 '''
 
@@ -99,7 +104,7 @@ def footer():
       <div class="footer-meta"><span>© 2026 Schmacko Napf &amp; Hundetraining by Katha</span><span>Fotos: Steffi Biller, KK-Fotografie</span></div>
     </footer>
   </main>
-  <script src="assets/site.js"></script>
+  <script src="assets/site.js?v={JS_V}"></script>
 </body>
 </html>
 '''
diff --git a/transportboxen.html b/transportboxen.html
index 2a557ca..097c23e 100644
--- a/transportboxen.html
+++ b/transportboxen.html
@@ -10,7 +10,7 @@
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Questrial&display=swap" rel="stylesheet">
-  <link rel="stylesheet" href="assets/site.css">
+  <link rel="stylesheet" href="assets/site.css?v=c9d7b72e">
 </head>
 <body>
   <header class="site-header">
@@ -79,6 +79,6 @@
       <div class="footer-meta"><span>© 2026 Schmacko Napf &amp; Hundetraining by Katha</span><span>Fotos: Steffi Biller, KK-Fotografie</span></div>
     </footer>
   </main>
-  <script src="assets/site.js"></script>
+  <script src="assets/site.js?v=4a2c8d49"></script>
 </body>
 </html>