diff --git a/python-Flask.changes b/python-Flask.changes
index 58712f4..a9f9e03 100644
--- a/python-Flask.changes
+++ b/python-Flask.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Sun Aug 22 19:07:48 UTC 2021 - Stefan Schubert <schubi@suse.de>
+
+- Use libalternatives instead of update-alternatives.
+
 -------------------------------------------------------------------
 Sat Jun 19 07:28:01 UTC 2021 - Michael Ströder <michael@stroeder.com>
 
diff --git a/python-Flask.spec b/python-Flask.spec
index 1408ffa..5a3c57f 100644
--- a/python-Flask.spec
+++ b/python-Flask.spec
@@ -16,6 +16,12 @@
 #
 
 
+%if 0%{?suse_version} > 1500
+%bcond_without libalternatives
+%else
+%bcond_with libalternatives
+%endif
+
 %define oldpython python
 %define skip_python2 1
 %{?!python_module:%define python_module() python-%{**} python3-%{**}}
@@ -35,13 +41,17 @@ BuildRequires:  %{python_module itsdangerous >= 2.0}
 BuildRequires:  %{python_module pytest >= 6.2.4}
 BuildRequires:  %{python_module setuptools}
 BuildRequires:  fdupes
-BuildRequires:  python-rpm-macros
+BuildRequires:  python-rpm-macros >= 20210929
 Requires:       python-Jinja2 >= 3.0
 Requires:       python-Werkzeug >= 2.0
 Requires:       python-click >= 7.1.2
 Requires:       python-itsdangerous >= 2.0
+%if %{with libalternatives}
+Requires:       alts
+%else
 Requires(post): update-alternatives
 Requires(postun):update-alternatives
+%endif
 BuildArch:      noarch
 %if %{?suse_version} < 1500
 BuildRequires:  python
@@ -71,13 +81,16 @@ reference for python-Flask.
 %install
 %python_install
 %python_clone -a %{buildroot}%{_bindir}/flask
-
 %fdupes %{buildroot}%{python_sitelib}
 
 %check
 export LANG=en_US.UTF-8
 %pytest
 
+%pre
+# If libalternatives is used: Removing old update-alternatives entries.
+%python_libalternatives_reset_alternative flask
+
 %post
 %python_install_alternative flask