Your requirements could not be resolved to an installable set of packages. Problem 1 - jms/serializer-bundle[1.4.0, ..., 1.5.0] require symfony/framework-bundle ~2.3|~3.0 -> found symfony/framework-bundle[v2.3.0, ..., v2.8.52, v3.0.0, ..., v3.4.47] but it conflicts with your root composer.json require (^5.1 || ^6.0 || ^7.0). - jms/serializer-bundle[2.3.0, ..., 2.4.4] require php ^5.4|^7.0 -> your php version (8.3.1) does not satisfy that requirement. - jms/serializer-bundle[3.0.0, ..., 3.7.0] require php ^7.2 -> your php version (8.3.1) does not satisfy that requirement. - jms/serializer-bundle[3.8.0, ..., 3.10.0] require symfony/dependency-injection ^3.3 || ^4.0 || ^5.0 -> found symfony/dependency-injection[v3.3.0, ..., v3.4.47, v4.0.0, ..., v4.4.49, v5.0.0, ..., v5.4.34] but these were not loaded, likely because it conflicts with another require. - jms/serializer-bundle[4.0.0, ..., 4.0.2] require symfony/dependency-injection ^3.3 || ^4.0 || ^5.0 || ^6.0 -> found symfony/dependency-injection[v3.3.0, ..., v3.4.47, v4.0.0, ..., v4.4.49, v5.0.0, ..., v5.4.34, v6.0.0, ..., v6.4.2] but these were not loaded, likely because it conflicts with another require. - jms/serializer-bundle[4.1.0, ..., 4.2.0] require symfony/dependency-injection ^3.4 || ^4.0 || ^5.0 || ^6.0 -> found symfony/dependency-injection[v3.4.0, ..., v3.4.47, v4.0.0, ..., v4.4.49, v5.0.0, ..., v5.4.34, v6.0.0, ..., v6.4.2] but these were not loaded, likely because it conflicts with another require. - Root composer.json requires jms/serializer-bundle ^1.4 || ^2.3 || ^3.0 || ^4.0 -> satisfiable by jms/serializer-bundle[1.4.0, 1.5.0, 2.3.0, ..., 2.4.4, 3.0.0, ..., 3.10.0, 4.0.0, ..., 4.2.0].