diff --git a/python-blockdiag.changes b/python-blockdiag.changes
index 1895398..aa8f238 100644
--- a/python-blockdiag.changes
+++ b/python-blockdiag.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Dec 1 20:18:05 UTC 2016 - termim@gmail.com
+
+- use update-alternatives
+
 -------------------------------------------------------------------
 Thu May 12 07:12:05 UTC 2016 - tbechtold@suse.com
 
diff --git a/python-blockdiag.spec b/python-blockdiag.spec
index c8f1e60..a476a90 100644
--- a/python-blockdiag.spec
+++ b/python-blockdiag.spec
@@ -23,9 +23,12 @@ Summary:        Generates block-diagram image from text
 License:        Apache-2.0
 Group:          Development/Languages/Python
 Url:            http://blockdiag.com/
-Source:         https://pypi.python.org/packages/source/b/blockdiag/blockdiag-%{version}.tar.gz
+Source:         https://files.pythonhosted.org/packages/source/b/blockdiag/blockdiag-%{version}.tar.gz
 BuildRequires:  python-devel
 BuildRequires:  python-setuptools
+BuildRequires:  fdupes
+Requires(post): update-alternatives
+Requires(postun): update-alternatives
 Requires:       python-Pillow
 Requires:       python-funcparserlib
 Requires:       python-webcolors
@@ -50,11 +53,23 @@ python setup.py build
 
 %install
 python setup.py install --prefix=%{_prefix} --root=%{buildroot}
+%fdupes %{buildroot}%{python_sitelib}
+mv %{buildroot}%{_bindir}/blockdiag %{buildroot}%{_bindir}/blockdiag-%{py_ver}
+
+%post
+update-alternatives \
+    --install %{_bindir}/blockdiag blockdiag %{_bindir}/blockdiag-%{py_ver} 50
+
+%postun
+if [ $1 -eq 0 ] ; then
+  update-alternatives --remove blockdiag %{_bindir}/blockdiag-%{py_ver}
+fi
 
 %files
 %defattr(-,root,root,-)
 %doc CHANGES.rst LICENSE README.rst
-%{_bindir}/blockdiag
+%{_bindir}/blockdiag-%{py_ver}
 %{python_sitelib}/*
+%ghost %{_sysconfdir}/alternatives/blockdiag
 
 %changelog