diff --git a/calypso.spec b/calypso.spec
index b31039e..251bbcb 100644
--- a/calypso.spec
+++ b/calypso.spec
@@ -6,7 +6,7 @@
 
 Name: calypso
 Version: 2.0
-Release: 0.24.%{date}git%{shortcommit}%{?dist}
+Release: 0.17.%{date}git%{shortcommit}%{?dist}
 Summary: Free and open-source CalDAV calendar server
 # Automatically converted from old format: GPLv3+ - review is highly recommended.
 License: GPL-3.0-or-later
@@ -18,17 +18,22 @@ Source3: %{name}.pam
 Source4: %{name}.systemd
 # fix python-daemon dependency name
 Patch0: %{name}-daemon.patch
+BuildRequires: python3-daemon
 BuildRequires: python3-devel
+BuildRequires: python3-setuptools
+BuildRequires: python3-iniparse
+BuildRequires: python3-vobject
 BuildRequires: systemd-rpm-macros
 %if %{with check}
 BuildRequires: git-core
-BuildRequires: python3-iniparse
 BuildRequires: python3-pytest
 %endif
+Requires(pre): shadow-utils
 Requires(post): git-core
 Requires: git-core
 Requires: python3-lockfile
 Recommends: python3-kerberos
+Recommends: python3-PyPAM
 BuildArch: noarch
 
 %description
@@ -40,36 +45,31 @@ patches to Radicale but was eventually split off as a separate project.
 * Uses git to retain a history of the database
 
 %prep
-%autosetup -p1 -n %{name}-%{commit}
-
-# Create a sysusers.d config file
-cat >calypso.sysusers.conf <<EOF
-u calypso - 'CalDAV/CardDAV server with git storage' %{_sharedstatedir}/calypso -
-EOF
-
-%generate_buildrequires
-%pyproject_buildrequires
+%setup -q -n %{name}-%{commit}
+%patch -P0 -p1 -b .daemon
 
 %build
-%pyproject_wheel
+%py3_build
 
 %install
-%pyproject_install
-%pyproject_save_files -l calypso
+%py3_install
 mkdir -p %{buildroot}%{_sharedstatedir}/calypso
 install -Dpm644 calypso.1 %{buildroot}%{_mandir}/man1/calypso.1
 install -Dpm644 %{S:2} %{buildroot}%{_sysconfdir}/calypso/config
 install -Dpm644 %{S:3} %{buildroot}%{_sysconfdir}/pam.d/calypso
 install -Dpm644 %{S:4} %{buildroot}%{_unitdir}/calypso.service
 
-install -m0644 -D calypso.sysusers.conf %{buildroot}%{_sysusersdir}/calypso.conf
-
 %if %{with check}
 %check
-%pyproject_check_import -t
 %pytest
 %endif
 
+%pre
+getent group calypso >/dev/null || groupadd -r calypso
+getent passwd calypso >/dev/null || \
+    useradd -r -g calypso -d %{_sharedstatedir}/calypso -s /sbin/nologin \
+    -c "CalDAV/CardDAV server with git storage" calypso
+exit 0
 
 %preun
 %systemd_preun calypso.service
@@ -91,7 +91,8 @@ fi
 %postun
 %systemd_postun_with_restart calypso.service
 
-%files -f %{pyproject_files}
+%files
+%license COPYING
 %doc README collection-config config
 %dir %attr(0750,root,calypso) %{_sysconfdir}/calypso
 %config(noreplace) %{_sysconfdir}/calypso/config
@@ -99,32 +100,11 @@ fi
 %{_bindir}/calypso
 %{_mandir}/man1/calypso.1*
 %{_unitdir}/calypso.service
+%{python3_sitelib}/calypso-%{version}-py%{python3_version}.egg-info
+%{python3_sitelib}/calypso
 %dir %attr(0750,calypso,calypso) %{_sharedstatedir}/calypso
-%{_sysusersdir}/calypso.conf
 
 %changelog
-* Fri Sep 19 2025 Python Maint <python-maint@redhat.com> - 2.0-0.24.20190429git7317d88
-- Rebuilt for Python 3.14.0rc3 bytecode
-
-* Fri Aug 15 2025 Python Maint <python-maint@redhat.com> - 2.0-0.23.20190429git7317d88
-- Rebuilt for Python 3.14.0rc2 bytecode
-
-* Wed Jul 23 2025 Fedora Release Engineering <releng@fedoraproject.org> - 2.0-0.22.20190429git7317d88
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild
-
-* Mon Jul 21 2025 Dominik Mierzejewski <dominik@greysector.net> 2.0-0.21.20190429git7317d88
-- switch to modern python packaging macros (resolves rhbz#2377219)
-- drop nonexistent Recommends:
-
-* Tue Jun 03 2025 Python Maint <python-maint@redhat.com> - 2.0-0.20.20190429git7317d88
-- Rebuilt for Python 3.14
-
-* Tue Feb 11 2025 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 2.0-0.19.20190429git7317d88
-- Add sysusers.d config file to allow rpm to create users/groups automatically
-
-* Thu Jan 16 2025 Fedora Release Engineering <releng@fedoraproject.org> - 2.0-0.18.20190429git7317d88
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild
-
 * Thu Jul 25 2024 Miroslav Suchý <msuchy@redhat.com> - 2.0-0.17.20190429git7317d88
 - convert license to SPDX