Install and Update Composer

Install Composer

wget https://getcomposer.org/installer

 php installer

 unlink installer

sudo mv composer.phar /usr/local/bin/composer.phar

alias composer='/usr/local/bin/composer.phar'

NOTE : Please check the SHA384 with https://getcomposer.org/download/

Check composer version

composer --version

You can get other versions of composer from : https://getcomposer.org/download/