diff --git a/cdk.changes b/cdk.changes
index 306593c..6abf682 100644
--- a/cdk.changes
+++ b/cdk.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Fri Jun 23 10:44:54 UTC 2023 - Dr. Werner Fink <werner@suse.de>
+
+- Let libcdk6_3_4 conflict with older libcdk6_2_4 
+
 -------------------------------------------------------------------
 Fri Jun 23 06:18:15 UTC 2023 - Dr. Werner Fink <werner@suse.de>
 
diff --git a/cdk.spec b/cdk.spec
index 4e27f4a..92a77e3 100644
--- a/cdk.spec
+++ b/cdk.spec
@@ -45,6 +45,7 @@ menu, a radio list, a viewer widget, and a dialog box.
 Summary:        The Runtime for the Curses Development Kit - Shared library
 Group:          Development/Libraries/C and C++
 Conflicts:      libcdk5
+Conflicts:      libcdk6_2_4
 
 %description -n %lname
 CDK is a widget set developed on top of the basic curses library. It