diff --git a/libavif.spec b/libavif.spec
index 9000c1b..dd2247c 100644
--- a/libavif.spec
+++ b/libavif.spec
@@ -1,6 +1,6 @@
 Name:          libavif
 Version:       1.0.4
-Release:       1mamba
+Release:       2mamba
 Summary:       Library for encoding and decoding .avif files
 Group:         System/Libraries
 Vendor:        openmamba
@@ -29,6 +29,7 @@ BuildRequires: cmake
 BuildRequires: libsvt-av1-devel >= 1.0.0
 %endif
 Obsoletes:     libavif13 < 1.0.1
+Obsoletes:     libavif15 <= 0.11.1-2mamba
 
 %description
 Library for encoding and decoding .avif files .
@@ -39,6 +40,7 @@ Summary:       Development files for %{name}
 Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
 Requires:      pkg-config
 Obsoletes:     libavif13-devel < 1.0.1
+Obsoletes:     libavif15-deveo <= 0.11.1-2mamba
 
 %description devel
 This package contains libraries and header files for developing applications that use %{name}.
@@ -105,6 +107,9 @@ This package contains utility applications for %{name}.
 %{_bindir}/avifenc
 
 %changelog
+* Tue Mar 26 2024 Silvan Calarco <silvan.calarco@mambasoft.it> 1.0.4-2mamba
+- obsolete libavif15
+
 * Fri Feb 09 2024 Automatic Build System <autodist@openmamba.org> 1.0.4-1mamba
 - automatic version update by autodist