diff --git a/czytanie.html b/czytanie.html
index 7bf6514..7310e76 100644
--- a/czytanie.html
+++ b/czytanie.html
@@ -4,7 +4,7 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width,initial-scale=1,viewport-fit=cover" />
     <title>Czytanie</title>
-    <link rel="stylesheet" href="styles.css" />
+    <link rel="stylesheet" href="styles.css?v=20260521" />
   </head>
   <body>
 
@@ -47,7 +47,7 @@
       <button id="next-line-btn" class="next-line-btn" aria-label="Następna linia">▼</button>
     </div>
 
-    <script src="nav.js"></script>
-    <script src="czytanie.js"></script>
+    <script src="nav.js?v=20260521"></script>
+    <script src="czytanie.js?v=20260521"></script>
   </body>
 </html>
diff --git a/dzielenie.html b/dzielenie.html
index d02f7f4..e44c0bc 100644
--- a/dzielenie.html
+++ b/dzielenie.html
@@ -4,7 +4,7 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width,initial-scale=1,viewport-fit=cover" />
     <title>Nauka Dzielenia</title>
-    <link rel="stylesheet" href="styles.css" />
+    <link rel="stylesheet" href="styles.css?v=20260521" />
   </head>
   <body>
   <nav class="nav-wrap">
@@ -91,7 +91,7 @@
   </div>
 
   <footer class="app-footer">Commit: <span id="commit-sha">—</span></footer>
-  <script src="nav.js"></script>
-  <script src="dzielenie.js"></script>
+  <script src="nav.js?v=20260521"></script>
+  <script src="dzielenie.js?v=20260521"></script>
   </body>
 </html>
diff --git a/index.html b/index.html
index 8d1b623..189c4bd 100644
--- a/index.html
+++ b/index.html
@@ -4,7 +4,7 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width,initial-scale=1,viewport-fit=cover" />
     <title>Edu — Główne Menu</title>
-    <link rel="stylesheet" href="styles.css" />
+    <link rel="stylesheet" href="styles.css?v=20260521" />
   </head>
   <body>
     <div class="app-wrap">
@@ -47,6 +47,6 @@
     </div>
 
     <footer class="app-footer">Version: <span id="commit-sha">(loading)</span></footer>
-    <script src="version.js" defer></script>
+    <script src="version.js?v=20260521" defer></script>
   </body>
 </html>
diff --git a/mnozenie.html b/mnozenie.html
index e927987..325d604 100644
--- a/mnozenie.html
+++ b/mnozenie.html
@@ -4,7 +4,7 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width,initial-scale=1,viewport-fit=cover" />
     <title>Nauka Mnożenia</title>
-    <link rel="stylesheet" href="styles.css" />
+    <link rel="stylesheet" href="styles.css?v=20260521" />
   </head>
   <body>
   <nav class="nav-wrap">
@@ -91,7 +91,7 @@
   </div>
 
   <footer class="app-footer">Commit: <span id="commit-sha">—</span></footer>
-  <script src="nav.js"></script>
-  <script src="mnozenie.js"></script>
+  <script src="nav.js?v=20260521"></script>
+  <script src="mnozenie.js?v=20260521"></script>
   </body>
 </html>
diff --git a/testy.html b/testy.html
index b99a3ff..fbcd21d 100644
--- a/testy.html
+++ b/testy.html
@@ -4,7 +4,7 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width,initial-scale=1,viewport-fit=cover" />
     <title>Testy Matematyczne</title>
-    <link rel="stylesheet" href="styles.css" />
+    <link rel="stylesheet" href="styles.css?v=20260521" />
   </head>
   <body>
   <nav class="nav-wrap">
@@ -147,8 +147,8 @@
 
   <footer class="app-footer">Version: <span id="commit-sha">(loading)</span></footer>
 
-  <script src="version.js" defer></script>
-  <script src="nav.js"></script>
-  <script src="app.js"></script>
+  <script src="version.js?v=20260521" defer></script>
+  <script src="nav.js?v=20260521"></script>
+  <script src="app.js?v=20260521"></script>
   </body>
 </html>
