--- a/src/main/java/net/timbusproject/dpes/alternative/kb/Package.java
+++ b/src/main/java/net/timbusproject/dpes/alternative/kb/Package.java
@@ -18,6 +18,7 @@
 
 package net.timbusproject.dpes.alternative.kb;
 
+import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.LinkedList;
@@ -26,7 +27,9 @@
 /**
  * @author Rudolf Mayer
  */
-public class Package {
+public class Package implements Serializable {
+    private static final long serialVersionUID = 1L;
+
     public Package() {
         this.conflicts = new LinkedList<VersionedPackage>();
         this.depends = new LinkedList<VersionedPackage>();