Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires yiisoft/db ^2.0 -> satisfiable by yiisoft/db[2.0.0]. - yiisoft/db 2.0.0 requires yiisoft/db-implementation 1.0.0 -> could not be found in any version, but the following packages provide it: - yiisoft/dummy-provider Yii Dummy Provider - yiisoft/db-mysql MySQL/MariaDB driver for Yii Database - yiisoft/db-sqlite SQLite driver for Yii Database - yiisoft/db-pgsql PostgreSQL driver for Yii Database - yiisoft/db-mssql Microsoft SQL Server driver for Yii Database - yiisoft/db-oracle Oracle driver for Yii Database Consider requiring one of these to satisfy the yiisoft/db-implementation requirement. Problem 2 - Root composer.json requires roave/infection-static-analysis-plugin ^1.40 -> satisfiable by roave/infection-static-analysis-plugin[1.40.0, 1.41.0, 1.42.0, 1.43.0]. - roave/infection-static-analysis-plugin 1.40.0 requires php ~8.2.0 || ~8.3.0 || ~8.4.0 -> your php version (8.1.34) does not satisfy that requirement. - roave/infection-static-analysis-plugin 1.41.0 requires php ~8.3.0 || ~8.4.0 -> your php version (8.1.34) does not satisfy that requirement. - roave/infection-static-analysis-plugin[1.42.0, ..., 1.43.0] require php ~8.3.0 || ~8.4.0 || ~8.5.0 -> 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.