diff --git a/python-sphinxcontrib-htmlhelp.spec b/python-sphinxcontrib-htmlhelp.spec
index 0470046..4e1f6bc 100644
--- a/python-sphinxcontrib-htmlhelp.spec
+++ b/python-sphinxcontrib-htmlhelp.spec
@@ -1,6 +1,6 @@
 Name:          python-sphinxcontrib-htmlhelp
 Version:       2.0.0
-Release:       1mamba
+Release:       2mamba
 Summary:       A sphinx extension which renders HTML help files
 Group:         System/Libraries
 Vendor:        openmamba
@@ -17,6 +17,8 @@ BuildRequires: libpython3-devel
 %{summary}.
 
 %if 0%{?with_pyver}
+%define py_requires_append \
+Obsoletes:     python-sphinxcontrib-htmlhelp < 2.0.0
 %pyver_package
 %endif
 
@@ -44,6 +46,9 @@ sed -i "\,\.egg-info/,d;s,.*/man/.*,&.gz," %{name}.filelist
 %doc LICENSE
 
 %changelog
+* Thu Jun 03 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 2.0.0-2mamba
+- obsolete python-sphinxconfig-htmlhelp
+
 * Sun May 30 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 2.0.0-1mamba
 - update to 2.0.0