{% include JB/setup %}
Basically, newer version of Zeppelin works with previous version notebook directory and configurations. So, copying notebook and conf directory should be enough.
Stop Zeppelin
bin/zeppelin-daemon.sh stop
Copy your notebook and conf directory into a backup directory
Download newer version of Zeppelin and Install. See Install page.
Copy backup notebook and conf directory into newer version of Zeppelin notebook and conf directory
Start Zeppelin
bin/zeppelin-daemon.sh start