diff --git a/activation-build.xml b/activation-build.xml
index da9e394..65b853e 100644
--- a/activation-build.xml
+++ b/activation-build.xml
@@ -16,7 +16,7 @@
 
   <property name="spec.version" value="1.2"/>
 
-  <property name="compiler.source" value="1.6"/>
+  <property name="compiler.source" value="1.8"/>
   <property name="compiler.target" value="${compiler.source}"/>
 
   <property name="build.finalName" value="${project.artifactId}-${project.version}"/>
diff --git a/glassfish-activation.changes b/glassfish-activation.changes
index be6e289..4e9d4a6 100644
--- a/glassfish-activation.changes
+++ b/glassfish-activation.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Fri Mar 18 16:49:05 UTC 2022 - Fridrich Strba <fstrba@suse.com>
+
+- Build with source/target levels 8
+
 -------------------------------------------------------------------
 Fri Mar 18 05:48:14 UTC 2022 - Fridrich Strba <fstrba@suse.com>
 
diff --git a/glassfish-activation.spec b/glassfish-activation.spec
index 5782bbb..5ddd92f 100644
--- a/glassfish-activation.spec
+++ b/glassfish-activation.spec
@@ -28,6 +28,7 @@ Source1:        activation-build.xml
 BuildRequires:  ant
 BuildRequires:  fdupes
 BuildRequires:  javapackages-local
+Obsoletes:      gnu-jaf
 Obsoletes:      jaf
 BuildArch:      noarch
 
@@ -40,6 +41,8 @@ bean to perform the operation(s).
 
 %package api
 Summary:        JavaBeans Activation Framework API jar
+Obsoletes:      gnu-jaf
+Obsoletes:      jaf
 
 %description api
 The JavaBeans Activation Framework (JAF) is a standard extension to the