I was having the same issue
turns out I was using an older version of laravel 2.x
# reinstall `laravel` using `composer`
composer global remove laravel/installer
composer global require "laravel/installer:^4.0"
this didn't work for me, because I had php 5.5
and laravel 4.0
requires php 7.x
# update `php` using `brew`
brew upgrade php
# or
brew install php@7.1
didn't work for me, because i was using an older unsupported mac osx 10.11
# download `php` with third-party support
curl -s https://php-osx.liip.ch/install.sh | bash -s 7.1
# add `php` to path
echo 'export PATH="/usr/local/php5/bin:${PATH}"' >> .bash_profile
# reinstall composer
rm /usr/local/bin/composer
php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('sha384', 'composer-setup.php') === '756890a4488ce9024fc62c56153228907f1545c228516cbf63f885e036d37e9a59d27d63f46af1d4d07ee0f76181c7d3') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"
mv composer.phar /usr/local/bin/composer
# reinstall `laravel` with `composer`
composer global remove laravel/installer
composer global require "laravel/installer:^4.0" --ignore-platform-reqs
refrences
How to Uninstall Laravel?
Package laravel/ui at version has a PHP requirement incompatible with your PHP version (5.6.40)
Install PHP 7.3 for Mac WITHOUT HomeBrew
Remove composer