diff --git a/build.xml b/build.xml
index 01ad2690..1cf07860 100644
--- a/build.xml
+++ b/build.xml
@@ -362,7 +362,7 @@
         </copy>
         <delete file="${build}/MANIFEST.MF"/>
         <manifest file="${build}/MANIFEST.MF">
-            <attribute name="Specification-Version" value="6.0.0-rc1"/>
+            <attribute name="Specification-Version" value="6.0.0-dev"/>
         </manifest>
 
         <jar jarfile="${dist}/lib/metviewer.jar" basedir="${build}" manifest="${build}/MANIFEST.MF">