Your requirements could not be resolved to an installable set of packages. Problem 1 - contributte/forms-multiplier is present at version 4.1.x-dev and cannot be modified by Composer - Root composer.json requires nette/forms ^3.1.12 -> satisfiable by nette/forms[v3.1.12, ..., v3.2.x-dev]. - contributte/forms-multiplier 4.1.x-dev conflicts with nette/component-model v3.0.3. - contributte/forms-multiplier 4.1.x-dev conflicts with nette/component-model v3.0.1. - contributte/forms-multiplier 4.1.x-dev conflicts with nette/component-model v3.0.0. - nette/component-model v3.1.0 requires php 8.1 - 8.3 -> your php version (8.0.30) does not satisfy that requirement. - nette/forms[v3.2.0, ..., v3.2.3] require php 8.1 - 8.3 -> your php version (8.0.30) does not satisfy that requirement. - nette/component-model[v3.1.1, ..., v3.1.x-dev] require php 8.1 - 8.4 -> your php version (8.0.30) does not satisfy that requirement. - nette/forms[v3.2.4, ..., v3.2.x-dev] require php 8.1 - 8.4 -> your php version (8.0.30) does not satisfy that requirement. - nette/forms[v3.1.12, ..., v3.1.x-dev] require nette/component-model ^3.0 -> satisfiable by nette/component-model[v3.0.0, ..., v3.1.x-dev].