diff --git a/mlt.spec b/mlt.spec
index be5a77e..0cdbecb 100644
--- a/mlt.spec
+++ b/mlt.spec
@@ -1,7 +1,7 @@
 %define apiver %(echo %version | cut -d. -f1)
 Name:          mlt
 Version:       7.20.0
-Release:       2mamba
+Release:       3mamba
 Summary:       An open source multimedia framework, designed and developed for television broadcasting
 Group:         Development/Tools
 Vendor:        openmamba
@@ -57,7 +57,7 @@ BuildRequires: librtaudio-devel >= 5.0.0-1mamba
 BuildRequires: ladspa-devel
 BuildRequires: frei0r-plugins-devel
 BuildRequires: sox-devel >= 14.4.2
-Obsoletes:     mlt < 7.0.0
+Obsoletes:     mlt6 < 7.0.0
 
 %description
 MLT is an open source multimedia framework, designed and developed for television broadcasting. It provides a toolkit for broadcasters, video editors, media players, transcoders, web streamers and many more types of applications. The functionality of the system is provided via an assortment of ready to use tools, xml authoring components, and an extendible plug-in based API.
@@ -68,7 +68,7 @@ Group:         System/Libraries
 Requires:      %{name} = %{version}-%{release}
 Provides:      libmlt++
 Obsoletes:     libmlt++ < 7.0.0
-Obsoletes:     libmlt < 7.0.0
+Obsoletes:     libmlt6 < 7.0.0
 
 %description -n lib%{name}
 MLT is an open source multimedia framework, designed and developed for television broadcasting. It provides a toolkit for broadcasters, video editors, media players, transcoders, web streamers and many more types of applications. The functionality of the system is provided via an assortment of ready to use tools, xml authoring components, and an extendible plug-in based API.
@@ -83,7 +83,7 @@ Provides:      libmlt++-devel
 Obsoletes:     libmlt++-devel < 7.0.0
 Provides:      mlt-devel
 Obsoletes:     mlt-devel < 7.0.0
-Obsoletes:     libmlt-devel < 7.0.0
+Obsoletes:     libmlt6-devel < 7.0.0
 
 %description -n lib%{name}-devel
 MLT is an open source multimedia framework, designed and developed for television broadcasting. It provides a toolkit for broadcasters, video editors, media players, transcoders, web streamers and many more types of applications. The functionality of the system is provided via an assortment of ready to use tools, xml authoring components, and an extendible plug-in based API.
@@ -161,6 +161,9 @@ This package contains the Python binding for %{name}.
 %{python3_sitearch}/mlt7.py
 
 %changelog
+* Thu Oct 19 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 7.20.0-3mamba
+- fix obsolete for mlt6
+
 * Tue Oct 10 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 7.20.0-2mamba
 - obsolete mlt6