Thank you Andreas. I have added the new jquery lib of 1.9 version to my theme/md by adding the folder like src/customer/comp.theme/templates/jquery/lib
Also changed the head.begin.vm by adding the new version.
I have deployed and still shows older version.
<script type="text/javascript" src="/loymain/javax.faces.resource/sap/comp.theme/templates/jquery/lib/jquery-1.4.2.min.js.jsf"></script>