Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires psalm/plugin-phpunit ^0.18.4 -> satisfiable by psalm/plugin-phpunit[0.18.4].
- Root composer.json requires phpunit/phpunit ^11.0.0 -> satisfiable by phpunit/phpunit[11.0.0, ..., 11.3.2].
- vimeo/psalm[5.15.0, ..., 5.24.0] require nikic/php-parser ^4.16 -> satisfiable by nikic/php-parser[v4.16.0, ..., v4.19.1].
- Conclusion: don't install one of nikic/php-parser[v5.1.0], vimeo/psalm[5.25.0] | install nikic/php-parser[v4.17.0] (conflict analysis result)
- You can only install one version of a package, so only one of these can be installed: nikic/php-parser[v4.16.0, ..., v4.19.1, v5.0.0, v5.0.1, v5.0.2, v5.1.0].
- Conclusion: install nikic/php-parser v5.1.0 (conflict analysis result)
- Root composer.json requires vimeo/psalm ^5.15 -> satisfiable by vimeo/psalm[5.15.0, ..., 5.25.0].
Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.