diff --git a/gnuhealth-thalamus.changes b/gnuhealth-thalamus.changes
index 8390962..549a727 100644
--- a/gnuhealth-thalamus.changes
+++ b/gnuhealth-thalamus.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Jan 22 10:11:10 UTC 2024 - Axel Braun <axel.braun@gmx.de>
+
+- switch to wheel, enable %{?sle15_python_module_pythons}
+
 -------------------------------------------------------------------
 Thu Apr  8 12:34:35 UTC 2021 - Axel Braun <axel.braun@gmx.de>
 
diff --git a/gnuhealth-thalamus.spec b/gnuhealth-thalamus.spec
index 4571039..ebf9ac7 100644
--- a/gnuhealth-thalamus.spec
+++ b/gnuhealth-thalamus.spec
@@ -1,8 +1,8 @@
 #
-# spec file
+# spec file for package gnuhealth-thalamus
 #
-# Copyright (c) 2022 SUSE LLC
-# Copyright (c) 2017-2022 Dr. Axel Braun
+# Copyright (c) 2024 SUSE LLC
+# Copyright (c) 2017-2024 Dr. Axel Braun
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -18,6 +18,8 @@
 
 
 %bcond_without test
+%{?sle15_python_module_pythons}
+%define         skip_python39 1
 
 %define modname thalamus
 Name:           gnuhealth-%{modname}
@@ -28,29 +30,36 @@ License:        GPL-3.0-or-later
 Group:          Development/Languages/Python
 URL:            http://health.gnu.org
 Source:         https://files.pythonhosted.org/packages/source/t/%{modname}/%{modname}-%{version}.tar.gz
+BuildRequires:  %{python_module devel}
+BuildRequires:  %{python_module pip}
+BuildRequires:  %{python_module setuptools}
+BuildRequires:  %{python_module wheel}
+BuildRequires:  fdupes
 BuildRequires:  postgresql-server
 BuildRequires:  python-rpm-macros
-BuildRequires:  python3-devel
-BuildRequires:  python3-setuptools
+
 %if %{with test}
-BuildRequires:  python3-Flask
-BuildRequires:  python3-Flask-Cors
-BuildRequires:  python3-Flask-HTTPAuth
-BuildRequires:  python3-Flask-RESTful
-BuildRequires:  python3-Flask-WTF
-BuildRequires:  python3-bcrypt
-BuildRequires:  python3-psycopg2
+BuildRequires:  %{python_module Flask-Cors}
+BuildRequires:  %{python_module Flask-HTTPAuth}
+BuildRequires:  %{python_module Flask-RESTful}
+BuildRequires:  %{python_module Flask-WTF}
+BuildRequires:  %{python_module Flask}
+BuildRequires:  %{python_module bcrypt}
+BuildRequires:  %{python_module psycopg2}
 %endif
-BuildRequires:  fdupes
-Requires:       postgresql-server
-Requires:       python3-Flask
-Requires:       python3-Flask-HTTPAuth
-Requires:       python3-Flask-RESTful
-Requires:       python3-Flask-WTF
-Requires:       python3-bcrypt
-Requires:       python3-psycopg2
+
+Requires:       %{python_module Flask-HTTPAuth}
+Requires:       %{python_module Flask-RESTful}
+Requires:       %{python_module Flask-WTF}
+Requires:       %{python_module Flask}
+Requires:       %{python_module bcrypt}
+Requires:       %{python_module psycopg2}
+# postgres may run on own cluster
+Suggests:       postgresql-server
 BuildArch:      noarch
 
+%python_subpackages
+
 %description
 Thalamus: The GNU Health Federation Message and Authentication Server
 =====================================================================
@@ -72,19 +81,19 @@ Thalamus is part of the GNU Health project, but it is a self contained,
 independent server that can be used in different health related scenarios.
 
 %prep
-%setup -q -n %{modname}-%{version}
+%autosetup -n %{modname}-%{version}
 
 %build
-python3 setup.py build
+%pyproject_wheel
 
 %install
-python3 setup.py install --prefix="%{_prefix}" --root=%{buildroot}
-%fdupes %{buildroot}%{$python_sitelib}
+%pyproject_install
+%python_expand %fdupes %{buildroot}%{$python_sitelib}
 
-%files
+%files %{python_files}
 %defattr(-,root,root)
 %doc README.rst
 %license LICENSE
-%{python3_sitelib}/*
+%{python_sitelib}/*
 
 %changelog