diff --git a/app.py b/app.py
index 54324e3..5eca872 100644
--- a/app.py
+++ b/app.py
@@ -147,6 +147,25 @@ WEBP_SAVE_PARAMS = {
     "quality": 95,  # tylko jeśli lossless=False
 }
 
+
+def build_fingerprint(paths):
+    h = hashlib.sha256()
+    for base in paths:
+        if not os.path.exists(base):
+            continue
+        for root, _, files in os.walk(base):
+            for f in sorted(files):
+                p = os.path.join(root, f)
+                try:
+                    with open(p, "rb") as fh:
+                        h.update(fh.read())
+                except Exception:
+                    pass
+    return h.hexdigest()[:8]
+
+APP_VERSION = f"{datetime.now():%Y.%m.%d}+{build_fingerprint(['templates','static','app.py'])}"
+app.config['APP_VERSION'] = APP_VERSION
+
 db = SQLAlchemy(app)
 socketio = SocketIO(app, async_mode="eventlet")
 login_manager = LoginManager(app)
@@ -1320,6 +1339,11 @@ def load_user(user_id):
     return db.session.get(User, int(user_id))
 
 
+@app.context_processor
+def inject_version():
+    return {'APP_VERSION': app.config['APP_VERSION']}
+
+
 @app.context_processor
 def inject_time():
     return dict(time=time)
diff --git a/templates/admin/admin_panel.html b/templates/admin/admin_panel.html
index d41f051..bc7346a 100644
--- a/templates/admin/admin_panel.html
+++ b/templates/admin/admin_panel.html
@@ -218,7 +218,8 @@
         — <strong>{{ month_str|replace('-', ' / ') }}</strong>
         {% endif %}
       </h3>
-      <form method="post" action="{{ url_for('admin_delete_list') }}" onsubmit="return confirm('Na pewno usunąć tę listę?')" class="d-inline">
+      <form method="post" action="{{ url_for('admin_delete_list') }}"
+        onsubmit="return confirm('Na pewno usunąć tę listę?')" class="d-inline">
         <div class="table-responsive">
           <table class="table table-dark align-middle sortable">
             <thead>
@@ -350,7 +351,7 @@
       checkboxes.forEach(cb => cb.checked = this.checked);
     });
   </script>
-  <script src="{{ url_for('static_bp.serve_js', filename='preview_list_modal.js') }}"></script>
+  <script src="{{ url_for('static_bp.serve_js', filename='preview_list_modal.js') }}?v={{ APP_VERSION }}"></script>
   {% endblock %}
 
   {% endblock %}
\ No newline at end of file
diff --git a/templates/admin/edit_list.html b/templates/admin/edit_list.html
index 48cb8c6..ca18c13 100644
--- a/templates/admin/edit_list.html
+++ b/templates/admin/edit_list.html
@@ -122,10 +122,9 @@
       <div class="mb-4 border-top pt-3 mt-4">
         <h5 class="mb-3">🔐 Użytkownicy z dostępem</h5>
 
-       <a class="btn btn-outline-warning btn-sm mb-3"
-         href="{{ url_for('admin_lists_access', list_id=list.id) }}">
-         ⚙️ Edytuj uprawnienia
-       </a>
+        <a class="btn btn-outline-warning btn-sm mb-3" href="{{ url_for('admin_lists_access', list_id=list.id) }}">
+          ⚙️ Edytuj uprawnienia
+        </a>
 
         {% if permitted_users %}
         <ul class="list-group list-group-flush mb-3">
@@ -302,5 +301,5 @@
 
 {% endblock %}
 {% block scripts %}
-<script src="{{ url_for('static_bp.serve_js', filename='select.js') }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='select.js') }}?v={{ APP_VERSION }}"></script>
 {% endblock %}
\ No newline at end of file
diff --git a/templates/admin/list_products.html b/templates/admin/list_products.html
index a946f56..0be9c13 100644
--- a/templates/admin/list_products.html
+++ b/templates/admin/list_products.html
@@ -168,8 +168,8 @@
 </div>
 
 {% block scripts %}
-<script src="{{ url_for('static_bp.serve_js', filename='product_suggestion.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='table_search.js') }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='product_suggestion.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='table_search.js') }}?v={{ APP_VERSION }}"></script>
 {% endblock %}
 
 {% endblock %}
\ No newline at end of file
diff --git a/templates/admin/mass_edit_categories.html b/templates/admin/mass_edit_categories.html
index 2946ca8..250cf50 100644
--- a/templates/admin/mass_edit_categories.html
+++ b/templates/admin/mass_edit_categories.html
@@ -151,6 +151,6 @@
 
 {% endblock %}
 {% block scripts %}
-<script src="{{ url_for('static_bp.serve_js', filename='preview_list_modal.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='categories_select_admin.js') }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='preview_list_modal.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='categories_select_admin.js') }}?v={{ APP_VERSION }}"></script>
 {% endblock %}
\ No newline at end of file
diff --git a/templates/admin/receipts.html b/templates/admin/receipts.html
index a90f165..5f3563c 100644
--- a/templates/admin/receipts.html
+++ b/templates/admin/receipts.html
@@ -20,27 +20,27 @@
       {{ (page_filesize / 1024) | round(1) }} kB
       {% endif %}
     </strong>
-      {% if not (id != 'all' and (id|string).isdigit()) %}
-        | Łącznie:
-        <strong>
-          {% if total_filesize >= 1024*1024 %}
-            {{ (total_filesize / 1024 / 1024) | round(2) }} MB
-          {% else %}
-            {{ (total_filesize / 1024) | round(1) }} kB
-          {% endif %}
-        </strong>
+    {% if not (id != 'all' and (id|string).isdigit()) %}
+    | Łącznie:
+    <strong>
+      {% if total_filesize >= 1024*1024 %}
+      {{ (total_filesize / 1024 / 1024) | round(2) }} MB
+      {% else %}
+      {{ (total_filesize / 1024) | round(1) }} kB
       {% endif %}
+    </strong>
+    {% endif %}
   </p>
 
   <div>
     {% if id is string and id.isdigit() and id|int > 0 %}
-      <a href="{{ url_for('admin_receipts', id='all') }}" class="btn btn-outline-light me-2">
-        Pokaż wszystkie paragony
-      </a>
+    <a href="{{ url_for('admin_receipts', id='all') }}" class="btn btn-outline-light me-2">
+      Pokaż wszystkie paragony
+    </a>
     {% else %}
-      <a href="{{ url_for('recalculate_filesizes_all') }}" class="btn btn-outline-light me-2">
-        Przelicz rozmiary plików
-      </a>
+    <a href="{{ url_for('recalculate_filesizes_all') }}" class="btn btn-outline-light me-2">
+      Przelicz rozmiary plików
+    </a>
     {% endif %}
     <a href="{{ url_for('admin_panel') }}" class="btn btn-outline-secondary">← Powrót do panelu</a>
   </div>
@@ -209,9 +209,9 @@
 </div>
 
 {% block scripts %}
-<script src="{{ url_for('static_bp.serve_js', filename='receipt_crop.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='admin_receipt_crop.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='receipt_crop_logic.js') }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='receipt_crop.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='admin_receipt_crop.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='receipt_crop_logic.js') }}?v={{ APP_VERSION }}"></script>
 {% endblock %}
 
 {% endblock %}
\ No newline at end of file
diff --git a/templates/admin/user_management.html b/templates/admin/user_management.html
index e6ad2d7..f4c63b3 100644
--- a/templates/admin/user_management.html
+++ b/templates/admin/user_management.html
@@ -115,7 +115,7 @@
 </div>
 
 {% block scripts %}
-<script src="{{ url_for('static_bp.serve_js', filename='user_management.js') }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='user_management.js') }}?v={{ APP_VERSION }}"></script>
 {% endblock %}
 
 
diff --git a/templates/base.html b/templates/base.html
index d50f9ca..3f0f0eb 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -9,27 +9,32 @@
 
   {# --- Bootstrap i główny css zawsze --- #}
   <link href="{{ url_for('static_bp.serve_css', filename='style.css') }}" rel="stylesheet">
-  <link href="{{ url_for('static_bp.serve_css_lib', filename='bootstrap.min.css') }}" rel="stylesheet">
+  <link href="{{ url_for('static_bp.serve_css_lib', filename='bootstrap.min.css') }}?v={{ APP_VERSION }}"
+    rel="stylesheet">
 
   {# --- Style CSS ładowane tylko dla niezablokowanych --- #}
   {% set exclude_paths = ['/system-auth'] %}
   {% if (exclude_paths | select("in", request.path) | list | length == 0)
   and has_authorized_cookie
   and not is_blocked %}
-  <link href="{{ url_for('static_bp.serve_css_lib', filename='glightbox.min.css') }}" rel="stylesheet">
-  <link href="{{ url_for('static_bp.serve_css_lib', filename='sort_table.min.css') }}" rel="stylesheet">
+  <link href="{{ url_for('static_bp.serve_css_lib', filename='glightbox.min.css') }}?v={{ APP_VERSION }}"
+    rel="stylesheet">
+  <link href="{{ url_for('static_bp.serve_css_lib', filename='sort_table.min.css') }}?v={{ APP_VERSION }}"
+    rel="stylesheet">
   {% endif %}
 
   {# --- Cropper CSS tylko dla wybranych podstron --- #}
   {% set substrings_cropper = ['/admin/receipts', '/edit_my_list'] %}
   {% if substrings_cropper | select("in", request.path) | list | length > 0 %}
-  <link href="{{ url_for('static_bp.serve_css_lib', filename='cropper.min.css') }}" rel="stylesheet">
+  <link href="{{ url_for('static_bp.serve_css_lib', filename='cropper.min.css') }}?v={{ APP_VERSION }}"
+    rel="stylesheet">
   {% endif %}
 
   {# --- Tom Select CSS tylko dla wybranych podstron --- #}
   {% set substrings_tomselect = ['/edit_my_list', '/admin/edit_list', '/admin/mass_edit_categories'] %}
   {% if substrings_tomselect | select("in", request.path) | list | length > 0 %}
-  <link href="{{ url_for('static_bp.serve_css_lib', filename='tom-select.bootstrap5.min.css') }}" rel="stylesheet">
+  <link href="{{ url_for('static_bp.serve_css_lib', filename='tom-select.bootstrap5.min.css') }}?v={{ APP_VERSION }}"
+    rel="stylesheet">
   {% endif %}
 </head>
 
@@ -81,6 +86,7 @@
     <hr class="text-secondary">
     <p class="mb-0">© 2025 <strong>linuxiarz.pl</strong> · <a href="https://gitea.linuxiarz.pl/gru/lista_zakupowa_live"
         target="_blank" class="link-success text-decoration-none"> source code</a>
+    <div class="small">v{{ APP_VERSION }}</div>
   </footer>
 
   <script src="{{ url_for('static_bp.serve_js_lib', filename='bootstrap.bundle.min.js') }}"></script>
@@ -101,14 +107,14 @@
   </script>
 
   {% if request.endpoint != 'system_auth' %}
-  <script src="{{ url_for('static_bp.serve_js_lib', filename='glightbox.min.js') }}"></script>
-  <script src="{{ url_for('static_bp.serve_js_lib', filename='socket.io.min.js') }}"></script>
-  <script src="{{ url_for('static_bp.serve_js_lib', filename='sort_table.min.js') }}"></script>
-  <script src="{{ url_for('static_bp.serve_js', filename='functions.js') }}"></script>
-  <script src="{{ url_for('static_bp.serve_js', filename='live.js') }}"></script>
-  <script src="{{ url_for('static_bp.serve_js', filename='sockets.js') }}"></script>
+  <script src="{{ url_for('static_bp.serve_js_lib', filename='glightbox.min.js') }}?v={{ APP_VERSION }}"></script>
+  <script src="{{ url_for('static_bp.serve_js_lib', filename='socket.io.min.js') }}?v={{ APP_VERSION }}"></script>
+  <script src="{{ url_for('static_bp.serve_js_lib', filename='sort_table.min.js') }}?v={{ APP_VERSION }}"></script>
+  <script src="{{ url_for('static_bp.serve_js', filename='functions.js') }}?v={{ APP_VERSION }}"></script>
+  <script src="{{ url_for('static_bp.serve_js', filename='live.js') }}?v={{ APP_VERSION }}"></script>
+  <script src="{{ url_for('static_bp.serve_js', filename='sockets.js') }}?v={{ APP_VERSION }}"></script>
   {% endif %}
-  <script src="{{ url_for('static_bp.serve_js', filename='toasts.js') }}"></script>
+  <script src="{{ url_for('static_bp.serve_js', filename='toasts.js') }}?v={{ APP_VERSION }}"></script>
   <script>
     let lightbox = GLightbox({
       selector: '.glightbox'
@@ -117,12 +123,13 @@
 
   {% set substrings = ['/admin/receipts', '/edit_my_list'] %}
   {% if substrings | select("in", request.path) | list | length > 0 %}
-  <script src="{{ url_for('static_bp.serve_js_lib', filename='cropper.min.js') }}"></script>
+  <script src="{{ url_for('static_bp.serve_js_lib', filename='cropper.min.js') }}?v={{ APP_VERSION }}"></script>
   {% endif %}
 
   {% set substrings = ['/edit_my_list', '/admin/edit_list', '/admin/mass_edit_categories'] %}
   {% if substrings | select("in", request.path) | list | length > 0 %}
-  <script src="{{ url_for('static_bp.serve_js_lib', filename='tom-select.complete.min.js') }}"></script>
+  <script
+    src="{{ url_for('static_bp.serve_js_lib', filename='tom-select.complete.min.js') }}?v={{ APP_VERSION }}"></script>
   {% endif %}
 
   {% endif %}
diff --git a/templates/edit_my_list.html b/templates/edit_my_list.html
index 0f7f436..1603ff6 100644
--- a/templates/edit_my_list.html
+++ b/templates/edit_my_list.html
@@ -104,17 +104,17 @@
       <label class="form-label">🔗 Link udostępniania (wejście przez link daje dostęp; zalogowani dostają
         uprawnienia na stałę po kliknięciu w link)</label>
 
-        {% if list.share_token %}
-        <div class="input-group mb-3">
-          <input type="text" class="form-control bg-dark text-white border-secondary"
-                readonly value="{{ url_for('shared_list', token=list.share_token, _external=True) }}"
-                id="sharedListUrl" aria-label="Udostępniony link">
-          <a class="btn btn-outline-light" href="{{ url_for('shared_list', token=list.share_token) }}" target="_blank"
-            title="Otwórz">Otwórz
-          </a>
-        </div>
+      {% if list.share_token %}
+      <div class="input-group mb-3">
+        <input type="text" class="form-control bg-dark text-white border-secondary" readonly
+          value="{{ url_for('shared_list', token=list.share_token, _external=True) }}" id="sharedListUrl"
+          aria-label="Udostępniony link">
+        <a class="btn btn-outline-light" href="{{ url_for('shared_list', token=list.share_token) }}" target="_blank"
+          title="Otwórz">Otwórz
+        </a>
+      </div>
       {% else %}
-        <div class="text-warning small">Brak tokenu udostępniania.</div>
+      <div class="text-warning small">Brak tokenu udostępniania.</div>
       {% endif %}
       <div class="text-info small">Ustawienie „🌐 Publiczna” nie jest wymagane dla dostępu z linku.</div>
     </div>
@@ -140,7 +140,8 @@
       {% if permitted_users and permitted_users|length > 0 %}
       <ul class="list-group list-group-flush">
         {% for u in permitted_users %}
-        <li class="list-group-item bg-dark text-white d-flex justify-content-between align-items-center border-secondary">
+        <li
+          class="list-group-item bg-dark text-white d-flex justify-content-between align-items-center border-secondary">
           <div>
             <span class="fw-semibold">@{{ u.username }}</span>
           </div>
@@ -277,8 +278,8 @@
 {% endblock %}
 
 {% block scripts %}
-<script src="{{ url_for('static_bp.serve_js', filename='confirm_delete.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='user_receipt_crop.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='receipt_crop_logic.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='select.js') }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='confirm_delete.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='user_receipt_crop.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='receipt_crop_logic.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='select.js') }}?v={{ APP_VERSION }}"></script>
 {% endblock %}
\ No newline at end of file
diff --git a/templates/expenses.html b/templates/expenses.html
index 1281412..119dfac 100644
--- a/templates/expenses.html
+++ b/templates/expenses.html
@@ -210,13 +210,13 @@
 {% endblock %}
 
 {% block scripts %}
-<script src="{{ url_for('static_bp.serve_js_lib', filename='chart.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='show_all_expense.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='expense_chart.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='expense_table.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='expense_tab.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='select_all_table.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='chart_controls.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='modal_chart.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='download_chart.js') }}"></script>
+<script src="{{ url_for('static_bp.serve_js_lib', filename='chart.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='show_all_expense.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='expense_chart.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='expense_table.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='expense_tab.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='select_all_table.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='chart_controls.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='modal_chart.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='download_chart.js') }}?v={{ APP_VERSION }}"></script>
 {% endblock %}
\ No newline at end of file
diff --git a/templates/list.html b/templates/list.html
index 6e80d0f..158eb53 100644
--- a/templates/list.html
+++ b/templates/list.html
@@ -260,9 +260,9 @@
   window.LIST_ID = {{ list.id }};
   window.IS_OWNER = {{ 'true' if is_owner else 'false' }};
 </script>
-<script src="{{ url_for('static_bp.serve_js', filename='mass_add.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='receipt_upload.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='sort_mode.js') }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='mass_add.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='receipt_upload.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='sort_mode.js') }}?v={{ APP_VERSION }}"></script>
 <script>
   setupList({{ list.id }}, '{{ current_user.username if current_user.is_authenticated else 'Gość' }}');
 </script>
diff --git a/templates/list_share.html b/templates/list_share.html
index 415bf22..98dfd83 100644
--- a/templates/list_share.html
+++ b/templates/list_share.html
@@ -244,12 +244,12 @@
     var isSorting = false;
   }
 </script>
-<script src="{{ url_for('static_bp.serve_js_lib', filename='Sortable.min.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='notes.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='clickable_row.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='receipt_section.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='receipt_upload.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='receipt_analysis.js') }}"></script>
+<script src="{{ url_for('static_bp.serve_js_lib', filename='Sortable.min.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='notes.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='clickable_row.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='receipt_section.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='receipt_upload.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='receipt_analysis.js') }}?v={{ APP_VERSION }}"></script>
 <script>
   setupList({{ list.id }}, '{{ current_user.username if current_user.is_authenticated else 'Gość' }}');
 </script>
diff --git a/templates/main.html b/templates/main.html
index 3b13d92..c7a006c 100644
--- a/templates/main.html
+++ b/templates/main.html
@@ -136,7 +136,8 @@
 {% endif %}
 
 
-<h3 class="mt-4"> {% if current_user.is_authenticated %}Udostępnione i publiczne listy innych użytkowników {% else %} Publiczne listy innych użytkowników {% endif %}</h3>
+<h3 class="mt-4"> {% if current_user.is_authenticated %}Udostępnione i publiczne listy innych użytkowników {% else %}
+  Publiczne listy innych użytkowników {% endif %}</h3>
 
 
 {% set lists_to_show = accessible_lists %}
@@ -250,8 +251,8 @@
 </div>
 
 {% block scripts %}
-<script src="{{ url_for('static_bp.serve_js', filename='toggle_button.js') }}"></script>
-<script src="{{ url_for('static_bp.serve_js', filename='select_month.js') }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='toggle_button.js') }}?v={{ APP_VERSION }}"></script>
+<script src="{{ url_for('static_bp.serve_js', filename='select_month.js') }}?v={{ APP_VERSION }}"></script>
 {% endblock %}
 
 {% endblock %}
\ No newline at end of file