Install latest version of git on CentOS release 6.8 -

Step 1. Install Dependencies - 
yum install curl-devel expat-devel gettext-devel openssl-devel zlib-devel gcc perl-ExtUtils

Step 2. Get the latest version of git to your server -
cd /usr/src
wget https://www.kernel.org/pub/software/scm/git/git-2.10.0.tar.gz

Step 3. Extract the zip folder -  tar -xvzf git-2.10.0.tar.gz

Step 4. Compile the code -

cd git-2.10.0
make prefix=/usr/local/git all
make prefix=/usr/local/git install
echo "export PATH=$PATH:/usr/local/git/bin" >> /etc/bashrc
source /etc/bashrc

Step5. Check git version - git --version