Your requirements could not be resolved to an installable set of packages. Problem 1 - illuminate/contracts 11.x-dev is an alias of illuminate/contracts dev-master and thus requires it to be installed too. - Conclusion: don't install illuminate/contracts dev-master (conflict analysis result) - pestphp/pest-plugin-laravel[v2.3.0, ..., 2.x-dev] require pestphp/pest ^2.33.6 -> satisfiable by pestphp/pest[v2.33.6, v2.34.0, v2.34.1, 2.x-dev]. - pestphp/pest-plugin-laravel v2.2.0 requires pestphp/pest ^2.13.0 -> satisfiable by pestphp/pest[v2.13.0, ..., 2.x-dev]. - pestphp/pest-plugin-laravel v2.1.0 requires pestphp/pest ^2.8.3 -> satisfiable by pestphp/pest[v2.8.3, ..., 2.x-dev]. - pestphp/pest-plugin-laravel v2.0.0 requires pestphp/pest ^2.0.0 -> satisfiable by pestphp/pest[v2.0.1, ..., 2.x-dev]. - pestphp/pest[v2.0.1, ..., v2.0.2] require nunomaduro/collision ^7.2.0 -> found nunomaduro/collision[v7.2.0, ..., v7.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest v2.1.0 requires nunomaduro/collision ^7.3.1 -> found nunomaduro/collision[v7.3.1, ..., v7.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest[v2.2.0, ..., v2.2.1] require nunomaduro/collision ^7.3.2 -> found nunomaduro/collision[v7.3.2, ..., v7.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest[v2.2.2, ..., v2.3.0] require nunomaduro/collision ^7.3.3 -> found nunomaduro/collision[v7.3.3, ..., v7.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest[v2.4.0, ..., v2.5.0] require nunomaduro/collision ^7.4.0 -> found nunomaduro/collision[v7.4.0, ..., v7.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest[v2.5.1, ..., v2.5.2] require nunomaduro/collision ^7.5.0 -> found nunomaduro/collision[v7.5.0, ..., v7.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest[v2.5.3, ..., v2.6.3] require nunomaduro/collision ^7.5.2 -> found nunomaduro/collision[v7.5.2, ..., v7.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest[v2.7.0, ..., v2.8.1] require nunomaduro/collision ^7.6.0 -> found nunomaduro/collision[v7.6.0, ..., v7.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest[v2.8.2, ..., v2.12.0] require nunomaduro/collision ^7.7.0 -> found nunomaduro/collision[v7.7.0, ..., v7.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest v2.12.1 requires nunomaduro/collision ^7.8.0 -> found nunomaduro/collision[v7.8.0, ..., v7.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest[v2.12.2, ..., v2.19.1] require nunomaduro/collision ^7.8.1 -> found nunomaduro/collision[v7.8.1, v7.9.0, v7.10.0, v7.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest[v2.19.2, ..., v2.22.1] require nunomaduro/collision ^7.9.0 -> found nunomaduro/collision[v7.9.0, v7.10.0, v7.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest[v2.23.0, ..., v2.23.2] require nunomaduro/collision ^7.9.0|^8.0.0 -> found nunomaduro/collision[v7.9.0, v7.10.0, v7.x-dev, v8.0.0, v8.0.1, v8.1.0, v8.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest[v2.24.0, ..., v2.28.1] require nunomaduro/collision ^7.10.0|^8.0.0 -> found nunomaduro/collision[v7.10.0, v7.x-dev, v8.0.0, v8.0.1, v8.1.0, v8.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest[v2.29.0, ..., v2.31.0] require nunomaduro/collision ^7.10.0|^8.0.1 -> found nunomaduro/collision[v7.10.0, v7.x-dev, v8.0.1, v8.1.0, v8.x-dev] but it conflicts with your root composer.json require (^6.0). - pestphp/pest[v2.32.0, ..., 2.x-dev] require nunomaduro/collision ^7.10.0|^8.1.0 -> found nunomaduro/collision[v7.10.0, v7.x-dev, v8.1.0, v8.x-dev] but it conflicts with your root composer.json require (^6.0). - laravel/framework[v7.0.0, ..., v7.28.4] require php ^7.2.5 -> yo