diff --git a/lxqt-session.spec b/lxqt-session.spec
index 5008318..064abc7 100644
--- a/lxqt-session.spec
+++ b/lxqt-session.spec
@@ -1,6 +1,6 @@
 Name:          lxqt-session
 Version:       1.0.0
-Release:       1mamba
+Release:       2mamba
 Summary:       Tools to handle LXQt sessions
 Group:         Graphical Desktop/Applications/Environment
 Vendor:        openmamba
@@ -60,6 +60,7 @@ Requires:      lxqt-admin
 Requires:      qps
 Requires:      screengrab
 Requires(post): shared-mime-info
+Obsoletes:     lxde <= 1.0-4mamba
 
 %description
 Tools to handle LXQt sessions.
@@ -123,6 +124,9 @@ update-mime-database /usr/share/mime >/dev/null 2>&1
 %doc AUTHORS LICENSE
 
 %changelog
+* Wed Dec 29 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 1.0.0-2mamba
+- obsolete lxde
+
 * Sun Nov 21 2021 Automatic Build System <autodist@mambasoft.it> 1.0.0-1mamba
 - automatic version update by autodist