Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires roave/infection-static-analysis-plugin ^1.36.0 -> satisfiable by roave/infection-static-analysis-plugin[1.36.0]. - roave/infection-static-analysis-plugin 1.36.0 requires vimeo/psalm ^6.0 -> found vimeo/psalm[6.0.0, ..., 6.4.0] but it conflicts with your root composer.json require (^5.26.1). Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.