Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phan/phan ^5.0 -> satisfiable by phan/phan[5.0.0a1, ..., v5.x-dev]. - Root composer.json requires vimeo/psalm 6.16.1 -> satisfiable by vimeo/psalm[6.16.1]. - felixfbecker/advanced-json-rpc v3.0.4 requires phpdocumentor/reflection-docblock ^4.0.0 -> satisfiable by phpdocumentor/reflection-docblock[4.0.0, ..., 4.3.4]. - felixfbecker/advanced-json-rpc v3.1.0 requires netresearch/jsonmapper ^1.0 -> satisfiable by netresearch/jsonmapper[v1.0.0, ..., v1.6.0]. - felixfbecker/advanced-json-rpc[v3.1.1, ..., v3.2.0] require netresearch/jsonmapper ^1.0 || ^2.0 -> satisfiable by netresearch/jsonmapper[v1.0.0, ..., v1.6.0, v2.0.0, v2.1.0]. - felixfbecker/advanced-json-rpc v3.2.1 requires netresearch/jsonmapper ^1.0 || ^2.0 || ^3.0 || ^4.0 -> satisfiable by netresearch/jsonmapper[v1.0.0, ..., v1.6.0, v2.0.0, v2.1.0, v3.0.0, v3.1.0, v3.1.1, v4.0.0, ..., v4.5.0]. - phan/phan[5.0.0a1, ..., 5.4.5] require netresearch/jsonmapper ^1.6.0|^2.0|^3.0|^4.0 -> satisfiable by netresearch/jsonmapper[v1.6.0, v2.0.0, v2.1.0, v3.0.0, v3.1.0, v3.1.1, v4.0.0, ..., v4.5.0]. - phan/phan[5.4.6, ..., v5.x-dev] require felixfbecker/advanced-json-rpc ^3.0.4 -> satisfiable by felixfbecker/advanced-json-rpc[v3.0.4, ..., v3.2.1]. - phpdocumentor/reflection-docblock[4.0.0, ..., 4.3.4] require php ^7.0 -> your php version (8.1.34) does not satisfy that requirement. - vimeo/psalm 6.16.1 requires netresearch/jsonmapper ^5.0 -> satisfiable by netresearch/jsonmapper[v5.0.0, v5.0.1]. - You can only install one version of a package, so only one of these can be installed: netresearch/jsonmapper[v1.0.0, ..., v1.6.0, v2.0.0, v2.1.0, v3.0.0, v3.1.0, v3.1.1, v4.0.0, ..., v4.5.0, v5.0.0, v5.0.1].