$ composer require "laravelcollective/html":"^5.4.0" ./composer.json has been updated Loading composer repositories with package information Updating dependencies (including require-dev) Your requirements could not be resolved to an installable set of packages.
Problem 1 - This package requires php >=7.0.0 but your PHP version (5.6.30) does not satisfy that requirement. Problem 2 - swiftmailer/swiftmailer v6.0.2 requires php >=7.0.0 -> your PHP version (5.6.30) does not satisfy that requirement. - swiftmailer/swiftmailer v6.0.2 requires php >=7.0.0 -> your PHP version (5.6.30) does not satisfy that requirement. - swiftmailer/swiftmailer v6.0.2 requires php >=7.0.0 -> your PHP version (5.6.30) does not satisfy that requirement. - Installation request for swiftmailer/swiftmailer (locked at v6.0.2) -> satisfiable by swiftmailer/swiftmailer[v6.0.2].
Installation failed, reverting ./composer.json to its original content.
Well that's because version 5.4 of "laravelcollective/html" does require php 7. Try lowering your version to 5.3