How to upgrade php in plesk

It is easy to upgrade php in plesk as follows,

wget -q -O - http://www.atomicorp.com/installers/atomic |sh
yum upgrade php-cli -y
yum upgrade php-devel -y
/etc/init.d/psa stop
/etc/init.d/psa start
/etc/init.d/httpd restart

Thats it ?