diff --git a/python-Glymur.changes b/python-Glymur.changes
index 0e583f1..5be2613 100644
--- a/python-Glymur.changes
+++ b/python-Glymur.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Tue May 26 06:34:26 UTC 2020 - Petr Gajdos <pgajdos@suse.com>
+
+- %python3_only -> %python_alternative
+
 -------------------------------------------------------------------
 Thu Mar 26 10:14:42 UTC 2020 - Marketa Calabkova <mcalabkova@suse.com>
 
diff --git a/python-Glymur.spec b/python-Glymur.spec
index 2281028..07653fd 100644
--- a/python-Glymur.spec
+++ b/python-Glymur.spec
@@ -31,6 +31,8 @@ BuildRequires:  fdupes
 BuildRequires:  procps
 BuildRequires:  python-rpm-macros
 Requires:       python-numpy >= 1.7.1
+Requires(post): update-alternatives
+Requires(postun): update-alternatives
 Recommends:     python-lxml
 BuildArch:      noarch
 # SECTION test requirements
@@ -52,15 +54,22 @@ Python interface to the OpenJPEG library
 
 %install
 %python_install
+%python_clone -a %{buildroot}%{_bindir}/jp2dump
 %python_expand %fdupes %{buildroot}%{$python_sitelib}
 
 %check
 %pytest
 
+%post
+%python_install_alternative jp2dump
+
+%postun
+%python_uninstall_alternative jp2dump
+
 %files %{python_files}
 %doc README.md CHANGES.txt
 %license LICENSE.txt
-%python3_only %{_bindir}/jp2dump
+%python_alternative %{_bindir}/jp2dump
 %{python_sitelib}/*
 
 %changelog