Your requirements could not be resolved to an installable set of packages. Problem 1 - ramsey/uuid[4.0.0-alpha1, ..., 4.1.0] require brick/math ^0.8 -> found brick/math[0.8.0, ..., 0.8.17] but it conflicts with your root composer.json require (^0.12). - ramsey/uuid[4.1.1, ..., 4.3.1] require brick/math ^0.8 || ^0.9 -> found brick/math[0.8.0, ..., 0.9.3] but it conflicts with your root composer.json require (^0.12). - ramsey/uuid 4.4.0 requires brick/math ^0.8 || ^0.9 || ^0.10 -> found brick/math[0.8.0, ..., 0.10.2] but it conflicts with your root composer.json require (^0.12). - ramsey/uuid[4.5.0, ..., 4.7.3] require brick/math ^0.8.8 || ^0.9 || ^0.10 -> found brick/math[0.8.8, ..., 0.10.2] but it conflicts with your root composer.json require (^0.12). - ramsey/uuid[4.7.4, ..., 4.x-dev] require brick/math ^0.8.8 || ^0.9 || ^0.10 || ^0.11 -> found brick/math[0.8.8, ..., 0.11.0] but it conflicts with your root composer.json require (^0.12). - laravel/horizon[v5.22.0, ..., 5.x-dev] require ramsey/uuid ^4.0 -> satisfiable by ramsey/uuid[4.0.0-alpha1, ..., 4.x-dev]. - Root composer.json requires laravel/horizon ^5.22 -> satisfiable by laravel/horizon[v5.22.0, 5.x-dev]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.