diff --git a/python-Pallets-Sphinx-Themes.spec b/python-Pallets-Sphinx-Themes.spec
index 2bbe555..ab646e1 100644
--- a/python-Pallets-Sphinx-Themes.spec
+++ b/python-Pallets-Sphinx-Themes.spec
@@ -29,11 +29,13 @@ BuildRequires:  %{python_module Sphinx >= 3.7}
 BuildRequires:  %{python_module flit-core}
 BuildRequires:  %{python_module packaging}
 BuildRequires:  %{python_module pip}
+BuildRequires:  %{python_module sphinx-notfound-page}
 BuildRequires:  %{python_module wheel}
 BuildRequires:  fdupes
 BuildRequires:  python-rpm-macros
-Requires:       python-Sphinx >= 3
+Requires:       python-Sphinx >= 5
 Requires:       python-packaging
+Requires:       python-sphinx-notfound-page
 BuildArch:      noarch
 %python_subpackages