Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires simplesamlphp/saml11, it could not be found in any version, there may be a typo in the package name. Problem 2 - Root composer.json requires simplesamlphp/ws-security ^1.0 -> satisfiable by simplesamlphp/ws-security[v1.0.0, v1.0.1]. - simplesamlphp/ws-security[v1.0.0, ..., v1.0.1] require simplesamlphp/saml2 ^5@dev -> found simplesamlphp/saml2[v5.0.0-alpha.1, ..., v5.0.0-alpha.14] but it does not match your minimum-stability. 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.