All upgrades of M3 are handled through upgrading the M3 yum package.
SSH into your m3 server and issue the following yum commands.
yum clean all yum -y upgrade m3
You should now see something similar to this
Total size: 2.3 M Installed size: 2.3 M Is this ok [y/N]: y Downloading Packages: Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Warning: RPMDB altered outside of yum. Installing : m3-5.3.1.0-10.noarch 1/1 Starting mysqld: [ OK ] Starting httpd: Done Verifying : m3-5.3.1.0-10.noarch 1/1 Installed: m3.noarch 0:5.3.1.0-10 Complete! [root@m3 ~]#
Your m3 has now been upgraded to the latest and greatest.