Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires symfony/http-kernel ^4.4 || ^5.4 || ^6.4 -> satisfiable by symfony/http-kernel[v4.4.0, ..., v4.4.51, v5.4.0, ..., v5.4.47, v6.4.0, ..., v6.4.15]. - Root composer.json requires symfony/symfony ^7.1 -> satisfiable by symfony/symfony[v7.1.0, ..., v7.1.8]. - symfony/http-kernel[v4.4.0, ..., v4.4.8] require php ^7.1.3 -> your php version (8.4.0-dev) does not satisfy that requirement. - Conclusion: don't install symfony/http-kernel v4.4.18 (conflict analysis result) - Conclusion: don't install symfony/http-kernel v4.4.26 (conflict analysis result) - Conclusion: don't install symfony/http-kernel v4.4.29 (conflict analysis result) - Conclusion: don't install symfony/http-kernel v4.4.51 (conflict analysis result) - Conclusion: don't install symfony/http-kernel v5.4.20 (conflict analysis result) - Conclusion: don't install symfony/http-kernel v5.4.47 (conflict analysis result) - Conclusion: don't install symfony/http-kernel v6.4.15 (conflict analysis result) - Only one of these can be installed: symfony/symfony[v7.1.0, ..., v7.1.8], symfony/http-kernel[v4.4.0, ..., v4.4.51, v5.4.0, ..., v5.4.47, v6.4.0, ..., v6.4.15]. symfony/symfony replaces symfony/http-kernel and thus cannot coexist with it.