diff --git a/python-cssutils.spec b/python-cssutils.spec
index feeb541..74cf244 100644
--- a/python-cssutils.spec
+++ b/python-cssutils.spec
@@ -26,6 +26,7 @@ Group:          Development/Languages/Python
 URL:            https://github.com/jaraco/cssutils
 Source0:        https://files.pythonhosted.org/packages/source/c/cssutils/cssutils-%{version}.tar.gz
 Source1:        %{name}.rpmlintrc
+BuildRequires:  %{python_module base >= 3.9}
 BuildRequires:  %{python_module setuptools_scm}
 BuildRequires:  %{python_module setuptools}
 BuildRequires:  fdupes