Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpactor/source-code-filesystem-extension ~0.1 -> satisfiable by phpactor/source-code-filesystem-extension[0.1.0, ..., 0.1.x-dev (alias of dev-master)]. - Root composer.json requires roave/security-advisories dev-master -> satisfiable by roave/security-advisories[dev-master]. - Root composer.json requires vimeo/psalm 6.3.0 -> satisfiable by vimeo/psalm[6.3.0]. - phpactor/source-code-filesystem dev-master requires symfony/filesystem ^4.2 || ^5.0 -> satisfiable by symfony/filesystem[v4.2.0-BETA1, ..., 4.4.x-dev, v5.0.0-BETA1, ..., 5.4.x-dev]. - phpactor/source-code-filesystem dev-master requires symfony/process ^4.0||^5.0 -> satisfiable by symfony/process[v4.0.0-BETA1, ..., 4.4.x-dev, v5.0.0-BETA1, ..., 5.4.x-dev]. - phpactor/source-code-filesystem-extension[0.1.0, ..., 0.1.4] require phpactor/container ^1.2 -> found phpactor/container[1.2.0, ..., 1.3.3] but it conflicts with your root composer.json require (^2.0). - phpactor/source-code-filesystem-extension dev-master requires phpactor/source-code-filesystem ^0.1.6 -> satisfiable by phpactor/source-code-filesystem[0.1.6, 0.1.7, 0.1.8, 0.1.x-dev (alias of dev-master)]. - roave/security-advisories dev-master conflicts with symfony/process v7.1.6. - roave/security-advisories dev-master conflicts with symfony/process v6.4.13. - roave/security-advisories dev-master conflicts with symfony/process v5.4.45. - roave/security-advisories dev-master conflicts with symfony/process v5.3.2. - roave/security-advisories dev-master conflicts with symfony/process v4.4.26. - roave/security-advisories dev-master conflicts with symfony/process 5.3.x-dev. - roave/security-advisories dev-master conflicts with symfony/process 5.0.x-dev. - roave/security-advisories dev-master conflicts with symfony/process 4.4.x-dev. - symfony/filesystem[v4.2.0-BETA1, ..., v4.4.8] require php ^7.1.3 -> your php version (8.3.6) does not satisfy that requirement. - symfony/process[v4.0.0-BETA1, ..., v4.4.10] require php ^7.1.3 -> your php version (8.3.6) does not satisfy that requirement. - symfony/filesystem[v5.0.0-BETA1, ..., v5.0.0-RC1] require php ^7.2.9 -> your php version (8.3.6) does not satisfy that requirement. - symfony/process[v5.0.0-BETA1, ..., v5.0.0-RC1] require php ^7.2.9 -> your php version (8.3.6) does not satisfy that requirement. - symfony/filesystem[v5.0.0, ..., v5.1.0-RC1] require php ^7.2.5 -> your php version (8.3.6) does not satisfy that requirement. - symfony/process[v5.0.0, ..., v5.1.0-RC1] require php ^7.2.5 -> your php version (8.3.6) does not satisfy that requirement. - symfony/filesystem v7.0.7 requires symfony/process ^6.4|^7.0 -> satisfiable by symfony/process[v6.4.0-BETA1, ..., 6.4.x-dev, v7.0.0-BETA1, ..., 7.3.x-dev]. - vimeo/psalm 6.3.0 requires symfony/filesystem ^6.0 || ^7.0 -> satisfiable by symfony/filesystem[v6.0.0-BETA1, ..., 6.4.x-dev, v7.0.0-BETA1, ..., 7.3.x-dev]. - Conclusion: don't install symfony/filesystem 5.3.x-dev (conflict analysis result) - Conclusion: don't install symfony/filesystem 5.4.x-dev (conflict analysis result) - Conclusion: don't install symfony/filesystem v5.4.39 (conflict analysis result) - Conclusion: don't install symfony/filesystem 6.4.x-dev (conflict analysis result) - Conclusion: don't install symfony/filesystem 7.3.x-dev (conflict analysis result) - Conclusion: don't install symfony/filesystem v6.4.7 (conflict analysis result) - phpactor/source-code-filesystem 0.1.x-dev is an alias of phpactor/source-code-filesystem dev-master and thus requires it to be installed too. - phpactor/source-code-filesystem-extension 0.1.x-dev is an alias of phpactor/source-code-filesystem-extension dev-master and thus requires it to be installed too. - You can only install one version of a package, so only one of these can be installed: symfony/filesystem[v4.2.0-BETA1, ..., 4.4.x-dev, v5.0.0-BETA1, ..., 5.4.x-dev, v6.0.0-BETA1