Don't use the globally installed version of composer. As a general rule: never use the globally installed version of composer, if you have no control over it. Download the composer.phar manually via
Code:
wget https://getcomposer.org/download/1.6.3/composer.phar
and then execute a composer update via
Code:
php composer.phar update -o
Important: replace "php" with the path to the correct PHP CLI - it needs to be the same version as the PHP version your web server uses for your Contao Installation.
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