diff --git a/plexus-classworlds.spec b/plexus-classworlds.spec
index f13f649..c477109 100644
--- a/plexus-classworlds.spec
+++ b/plexus-classworlds.spec
@@ -1,6 +1,6 @@
 Name:           plexus-classworlds
 Version:        2.5.1
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        Plexus Classworlds Classloader Framework
 License:        ASL 2.0 and Plexus
 URL:            http://plexus.codehaus.org/
@@ -11,6 +11,8 @@ BuildRequires:  maven-local
 BuildRequires:  mvn(org.apache.felix:maven-bundle-plugin)
 BuildRequires:  mvn(org.apache.maven.plugins:maven-dependency-plugin)
 
+Obsoletes:      classworlds < 1.1-13
+
 %description
 Classworlds is a framework for container developers
 who require complex manipulation of Java's ClassLoaders.
@@ -45,6 +47,9 @@ API documentation for %{name}.
 %doc LICENSE.txt LICENSE-2.0.txt
 
 %changelog
+* Thu Jun 12 2014 Mikolaj Izdebski <mizdebsk@redhat.com> - 2.5.1-5
+- Obsolete classworlds
+
 * Mon Jun  9 2014 Mikolaj Izdebski <mizdebsk@redhat.com> - 2.5.1-4
 - Add alias for classworlds:classworlds