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Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires simplesamlphp/simplesamlphp ~2.3.0 | ~2.4.0 -> satisfiable by simplesamlphp/simplesamlphp[v2.3.0, ..., v2.4.8]. - simplesamlphp/simplesamlphp[v2.3.0, ..., v2.3.4] require simplesamlphp/saml2 ^4.6 -> satisfiable by simplesamlphp/saml2[v4.6.0, ..., v4.20.3] from composer repo (https://repo.packagist.org) but simplesamlphp/saml2 dev-release-5.x is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - simplesamlphp/simplesamlphp v2.3.10 requires simplesamlphp/saml2 ^4.19.1 -> satisfiable by simplesamlphp/saml2[v4.19.1, ..., v4.20.3] from composer repo (https://repo.packagist.org) but simplesamlphp/saml2 dev-release-5.x is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - simplesamlphp/simplesamlphp v2.3.11 requires simplesamlphp/saml2 ^4.19.2 -> satisfiable by simplesamlphp/saml2[v4.19.2, ..., v4.20.3] from composer repo (https://repo.packagist.org) but simplesamlphp/saml2 dev-release-5.x is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - simplesamlphp/simplesamlphp[v2.3.5, ..., v2.3.6] require simplesamlphp/saml2 ^4.16 -> satisfiable by simplesamlphp/saml2[v4.16.14, ..., v4.20.3] from composer repo (https://repo.packagist.org) but simplesamlphp/saml2 dev-release-5.x is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - simplesamlphp/simplesamlphp[v2.3.7, ..., v2.3.9] require simplesamlphp/saml2 ^4.17 -> satisfiable by simplesamlphp/saml2[v4.17.0, ..., v4.20.3] from composer repo (https://repo.packagist.org) but simplesamlphp/saml2 dev-release-5.x is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - simplesamlphp/simplesamlphp[v2.4.0, ..., v2.4.8] require simplesamlphp/saml2 ^5.0.0 -> satisfiable by simplesamlphp/saml2[v5.0.0, ..., v5.0.7] from composer repo (https://repo.packagist.org) but simplesamlphp/saml2 dev-release-5.x is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance.