diff --git a/qwt6.changes b/qwt6.changes
index c470b9c..53cd369 100644
--- a/qwt6.changes
+++ b/qwt6.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Jul 21 08:06:44 UTC 2021 - Luigi Baldoni <aloisio@gmx.com>
+
+- Obsolete previous library version
+
 -------------------------------------------------------------------
 Tue Jul 20 07:16:05 UTC 2021 - Christophe Giboudeaux <christophe@krop.fr>
 
diff --git a/qwt6.spec b/qwt6.spec
index 8d60d25..4a49f93 100644
--- a/qwt6.spec
+++ b/qwt6.spec
@@ -17,6 +17,7 @@
 
 
 %define sover   6_2
+%define oldver  6_0
 Name:           qwt6
 Version:        6.2.0
 Release:        0
@@ -51,6 +52,7 @@ double.
 %package -n libqwt%{sover}
 Summary:        Shared library for Qt5 Widgets for Technical Applications
 Group:          System/Libraries
+Obsoletes:      lib%{name}-qt5-%{oldver} < %{version}
 Provides:       lib%{name}-qt5-%{sover} = %{version}
 Obsoletes:      lib%{name}-qt5-%{sover} < %{version}