Gitlab 7.5.3

HI
i have https://downloads-packages.s3.amazonaws.com/centos-6.6/gitlab-7.5.3_omnibus.5.2.1.ci-1.el6.x86_64.rpm

How to upgrade to the latest version ? Any guide?
my version linux Linux version 2.6.32-431.el6.x86_64 (mockbuild@c6b8.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC) )