Your lock file does not contain a compatible set of packages. Please run composer update. Problem 1 - drupal/search_api_pantheon is locked to version 8.1.4 and an update of this package was not requested. - drupal/search_api_pantheon 8.1.4 requires ext-zip * -> it is missing from your system. Install or enable PHP's zip extension. To enable extensions, verify that they are enabled in your .ini files: - /usr/local/etc/php/conf.d/docker-php-ext-gd.ini - /usr/local/etc/php/conf.d/docker-php-ext-sodium.ini You can also run `php --ini` in a terminal to see which files are used by PHP in CLI mode. Alternatively, you can run Composer with `--ignore-platform-req=ext-zip` to temporarily ignore these required extensions.