diff --git a/python-actdiag.changes b/python-actdiag.changes
index 8488a8b..90b5104 100644
--- a/python-actdiag.changes
+++ b/python-actdiag.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed May 27 09:35:59 UTC 2020 - Petr Gajdos <pgajdos@suse.com>
+
+- %python3_only -> %python_alternative
+
 -------------------------------------------------------------------
 Tue Feb 25 15:57:30 UTC 2020 - Thomas Bechtold <tbechtold@suse.com>
 
diff --git a/python-actdiag.spec b/python-actdiag.spec
index 882c1d6..4ddda10 100644
--- a/python-actdiag.spec
+++ b/python-actdiag.spec
@@ -31,13 +31,15 @@ BuildRequires:  fdupes
 BuildRequires:  python-rpm-macros
 Requires:       python-blockdiag >= 1.5.0
 Requires:       python-setuptools
+Requires(post): update-alternatives
+Requires(postun): update-alternatives
+BuildArch:      noarch
 %if 0%{?suse_version} >= 1000 || 0%{?fedora_version} >= 24 ||  0%{?rhel} >= 8
 Suggests:       python-docutils
 Suggests:       python-nose
 Suggests:       python-pep8 >= 1.3
 Suggests:       python-reportlab
 %endif
-BuildArch:      noarch
 %python_subpackages
 
 %description
@@ -51,12 +53,19 @@ actdiag generates activity-diagram image files from spec-text files.
 
 %install
 %python_install
+%python_clone -a %{buildroot}%{_bindir}/actdiag
 %python_expand %fdupes %{buildroot}%{$python_sitelib}
 
+%post
+%python_install_alternative actdiag
+
+%postun
+%python_uninstall_alternative actdiag
+
 %files %{python_files}
 %license LICENSE
 %doc README.rst
-%python3_only %{_bindir}/actdiag
+%python_alternative %{_bindir}/actdiag
 %{python_sitelib}/*
 
 %changelog