First install all needed dependence:

yum install gcc perl-devel perl perl-DBD-Multi zlib-devel zlib openssh-server 
openssh libcurl expat expat-devel xinetd

Now Download Git via a tarball:

mkdir -p /var/src
cd /var/src
rm -rf git-git*
wget --no-check-certificate https://github.com/git/git/tarball/master
tar -xzf git-git*
cd git-git*

Or if you already have git installed, via git it’s self:

mkdir -p /var/src
git clone git://git.kernel.org/pub/scm/git/git.git
cd git

Now compile the install.

make configure
./configure --prefix=/usr
make
make install