diff --git a/karldns/web/layout.py b/karldns/web/layout.py
index 4738496..378a23e 100644
--- a/karldns/web/layout.py
+++ b/karldns/web/layout.py
@@ -139,7 +139,7 @@ def _page(
         <script src="/clipboard.js?v=3" defer></script>
         {extra_scripts_html}
         <link href="/bootstrap-subset.css?v=3" rel="stylesheet">
-        <link href="/app.css?v=12" rel="stylesheet">
+        <link href="/app.css?v=13" rel="stylesheet">
         {extra_styles_html}
         {structured_data_html}
       </head>
diff --git a/tests/test_ui.py b/tests/test_ui.py
index 7b6c493..add55dc 100644
--- a/tests/test_ui.py
+++ b/tests/test_ui.py
@@ -554,7 +554,7 @@ def test_application_pages_use_stricter_script_csp(tmp_path: Path) -> None:
     assert '<script src="/clipboard.js?v=3" defer></script>' in response.text
     assert '<script src="/admin-tables.js?v=2" defer></script>' not in response.text
     assert '<link href="/bootstrap-subset.css?v=3" rel="stylesheet">' in response.text
-    assert '<link href="/app.css?v=12" rel="stylesheet">' in response.text
+    assert '<link href="/app.css?v=13" rel="stylesheet">' in response.text
     assert '<link href="/admin.css" rel="stylesheet">' not in response.text
     assert "cdn.jsdelivr.net/npm/bootstrap" not in response.text
     assert "<style>" not in response.text