Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php >=8.2 but your php version (8.1.34) does not satisfy that requirement. Problem 2 - Root composer.json requires peststan/peststan, it could not be found in any version, there may be a typo in the package name. Problem 3 - Root composer.json requires canvural/larastan-strict-rules ^3.0 -> satisfiable by canvural/larastan-strict-rules[3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.x-dev]. - canvural/larastan-strict-rules[3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.x-dev] require php ^8.2 -> your php version (8.1.34) does not satisfy that requirement. Problem 4 - Root composer.json requires guanguans/monorepo-builder-worker ^3.0 -> satisfiable by guanguans/monorepo-builder-worker[3.0.0, 3.1.0, 3.x-dev]. - guanguans/monorepo-builder-worker[3.0.0, 3.1.0, 3.x-dev] require php >=8.2 -> your php version (8.1.34) does not satisfy that requirement. Problem 5 - Root composer.json requires illuminate/support ^12.49 -> satisfiable by illuminate/support[v12.49.0, v12.50.0, v12.51.0, v12.52.0, v12.53.0, 12.x-dev]. - illuminate/support[v12.49.0, v12.50.0, v12.51.0, v12.52.0, v12.53.0, 12.x-dev] require php ^8.2 -> your php version (8.1.34) does not satisfy that requirement. Problem 6 - Root composer.json requires mrpunyapal/rector-pest ^0.1 -> satisfiable by mrpunyapal/rector-pest[0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.1.5, 0.1.6, 0.1.7, 0.1.8, 0.1.9]. - mrpunyapal/rector-pest[0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.1.5, 0.1.6, 0.1.7, 0.1.8, 0.1.9] require php ^8.2 -> your php version (8.1.34) does not satisfy that requirement. Problem 7 - Root composer.json requires peckphp/peck ^0.2 -> satisfiable by peckphp/peck[v0.2.0]. - peckphp/peck v0.2.0 requires php ^8.2 -> your php version (8.1.34) does not satisfy that requirement. Problem 8 - Root composer.json requires phiki/phiki ^2.1 -> satisfiable by phiki/phiki[v2.1.0, 2.x-dev]. - phiki/phiki[v2.1.0, 2.x-dev] require php ^8.2 -> your php version (8.1.34) does not satisfy that requirement. Problem 9 - Root composer.json requires larastan/larastan ^3.9 -> satisfiable by larastan/larastan[v3.9.0, v3.9.1, v3.9.2, v3.9.3, 3.x-dev]. - larastan/larastan[v3.9.0, v3.9.1, v3.9.2, v3.9.3, 3.x-dev] require php ^8.2 -> your php version (8.1.34) does not satisfy that requirement. Potential causes: - A typo in the package name - The package is not available in a stable-enough version according to your minimum-stability setting see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details. - It's a private package and you forgot to add a custom repository to find it Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.