diff --git a/openpgm.changes b/openpgm.changes
index 3d83f27..472f0d5 100644
--- a/openpgm.changes
+++ b/openpgm.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Jun 28 17:37:10 UTC 2021 - Matej Cepl <mcepl@suse.com>
+
+- Add use_python3.patch to allow use of Python3 instead of
+  Python2 for generating files.
+
 -------------------------------------------------------------------
 Mon Oct 19 13:39:35 UTC 2020 - Cristian Rodríguez <crrodriguez@opensuse.org>
 
diff --git a/openpgm.spec b/openpgm.spec
index aba5b3f..468f16a 100644
--- a/openpgm.spec
+++ b/openpgm.spec
@@ -2,7 +2,7 @@
 #
 # spec file for package openpgm
 #
-# Copyright (c) 2020 SUSE LLC
+# Copyright (c) 2021 SUSE LLC
 # Copyright (c) 2012 Pascal Bleser <pascal.bleser@opensuse.org>
 #
 # All modifications and additions to the file contributed by third parties
@@ -41,6 +41,9 @@ Patch1:         libpgm-5.2.122-reproducible-architecture.patch
 Patch2:         libpgm-5.2.122-pkg-config-do-not-add-I-to-non-existing-directory.patch
 # upstream pending patch https://github.com/steve-o/openpgm/pull/63
 Patch3:         libpgm-5.2.122-configure-rdtsc-checking-chg.patch
+# PATCH-{FIX|FEATURE}-{OPENSUSE|SLE|UPSTREAM} name-of-file.patch bsc#[0-9]+ mcepl@suse.com
+# this patch makes things totally awesome
+Patch4:         use_python3.patch
 BuildRequires:  autoconf
 BuildRequires:  automake
 BuildRequires:  gcc-c++
@@ -48,7 +51,7 @@ BuildRequires:  glibc-devel
 BuildRequires:  libtool
 BuildRequires:  make
 BuildRequires:  pkgconfig
-BuildRequires:  python-devel
+BuildRequires:  python3-base
 
 %description
 OpenPGM is an implementation of the Pragmatic General Multicast (PGM)
@@ -81,10 +84,7 @@ This subpackage contains the header files for OpenPGM.
 
 %prep
 %setup -q -n "%{name}-release-%{tarball_version}/openpgm/pgm"
-%patch0 -p1
-%patch1 -p1
-%patch2 -p1
-%patch3 -p1
+%autopatch -p1
 
 %build
 export ac_cv_func_ftime=no
diff --git a/use_python3.patch b/use_python3.patch
new file mode 100644
index 0000000..8485c0f
--- /dev/null
+++ b/use_python3.patch
@@ -0,0 +1,71 @@
+---
+ SConscript.libpgm    |    2 +-
+ version_generator.py |   23 ++++++++++++-----------
+ 2 files changed, 13 insertions(+), 12 deletions(-)
+
+--- a/SConscript.libpgm
++++ b/SConscript.libpgm
+@@ -60,7 +60,7 @@ e.Append(CCFLAGS = '-DGETTEXT_PACKAGE=\'
+ e.Command ('galois_tables.c', 'galois_generator.pl', "perl $SOURCE > $TARGET");
+ 
+ # Version stamping
+-e.Command ('version.c', 'version_generator.py', "python $SOURCE > $TARGET");
++e.Command ('version.c', 'version_generator.py', "python3 $SOURCE > $TARGET");
+ e.Depends ('version.c', src);
+ src += ['version.c'];
+ 
+--- a/version_generator.py
++++ b/version_generator.py
+@@ -1,4 +1,4 @@
+-#!/usr/bin/python
++#!/usr/bin/python3
+ 
+ import os
+ import platform
+@@ -7,19 +7,19 @@ import time
+ timestamp = time.gmtime(int(os.environ.get('SOURCE_DATE_EPOCH', time.time())))
+ build_date = time.strftime ("%Y-%m-%d", timestamp)
+ build_time = time.strftime ("%H:%M:%S", timestamp)
+-build_rev = filter (str.isdigit, "$Revision$")
++build_rev = ''.join (list (filter (str.isdigit, "$Revision$")))
+ build_system = platform.system()
+ build_machine = platform.machine()
+ if 'SOURCE_DATE_EPOCH' in os.environ:
+         build_system = 'BuildSystem'
+         build_machine = 'BuildMachine'
+ 
+-print """
++print ("""
+ /* vim:ts=8:sts=8:sw=4:noai:noexpandtab
+  * 
+  * OpenPGM version.
+  *
+- * Copyright (c) 2006-2011 Miru Limited.
++ * Copyright (c) 2006-2014 Miru Limited.
+  *
+  * This library is free software; you can redistribute it and/or
+  * modify it under the terms of the GNU Lesser General Public
+@@ -47,15 +47,16 @@ print """
+ 
+ const unsigned pgm_major_version = 5;
+ const unsigned pgm_minor_version = 2;
+-const unsigned pgm_micro_version = 122;
+-const char* pgm_build_date = "%s";
+-const char* pgm_build_time = "%s";
+-const char* pgm_build_system = "%s";
+-const char* pgm_build_machine = "%s";
+-const char* pgm_build_revision = "%s";
++const unsigned pgm_micro_version = 128;
++const char* pgm_build_date = "{0}";
++const char* pgm_build_time = "{1}";
++const char* pgm_build_system = "{2}";
++const char* pgm_build_machine = "{3}";
++const char* pgm_build_revision = "{4}";
+ 
+ 
+ /* eof */
+-"""%(build_date, build_time, build_system, build_machine, build_rev)
++""".format (build_date, build_time, build_system, build_machine, build_rev))
+ 
+ # end of file
++