diff --git a/SPECS/python-pycparser.spec b/SPECS/python-pycparser.spec
index 4a269c9..9504faa 100644
--- a/SPECS/python-pycparser.spec
+++ b/SPECS/python-pycparser.spec
@@ -3,7 +3,7 @@
 Name:           python-pycparser
 Summary:        C parser and AST generator written in Python
 Version:        2.20
-Release:        5%{?dist}
+Release:        6%{?dist}
 License:        BSD
 URL:            http://github.com/eliben/pycparser
 Source0:        %{url}/archive/release_v%{version}.tar.gz
@@ -71,6 +71,11 @@ popd
 %{python3_sitelib}/pycparser-*.egg-info/
 
 %changelog
+* Tue Feb 08 2022 Tomáš Hrnčiar <thrnciar@redhat.com> - 2.20-6
+- Add automatically generated Obsoletes tag with the python39- prefix
+  for smoother upgrade from RHEL8
+- Related: rhbz#1990421
+
 * Tue Aug 10 2021 Mohan Boddu <mboddu@redhat.com> - 2.20-5
 - Rebuilt for IMA sigs, glibc 2.34, aarch64 flags
   Related: rhbz#1991688