diff --git a/python-octave_kernel.spec b/python-octave_kernel.spec
index 76c75f0..c89f0b1 100644
--- a/python-octave_kernel.spec
+++ b/python-octave_kernel.spec
@@ -1,7 +1,7 @@
 %define pkgname %(echo %name | cut -d- -f2- | tr - _)
 Name:          python-octave_kernel
 Version:       0.35.1
-Release:       2mamba
+Release:       3mamba
 Summary:       An Octave kernel for Jupyter
 Group:         System/Libraries
 Vendor:        openmamba
@@ -22,6 +22,8 @@ BuildRequires: python3-devel >= 3.11.5-3mamba
 %{summary}.
 
 %if 0%{?with_pyver}
+%define py_requires_append \
+Obsoletes:     python-octave_kernel-py310 <= 0.35.1-2mamba
 %pyver_package
 %endif
 
@@ -52,6 +54,9 @@ CFLAGS="%{optflags}" %{__python} -m build --no-isolation --wheel
 %{_datadir}/jupyter/kernels/octave/*
 
 %changelog
+* Mon Jan 15 2024 Silvan Calarco <silvan.calarco@mambasoft.it> 0.35.1-3mamba
+- obsolete -py310 subpackages
+
 * Wed Sep 27 2023 Automatic Build System <autodist@mambasoft.it> 0.35.1-2mamba
 - rebuilt by autoport with build requirements: python3-devel>=3.11.5-3mamba