Your requirements could not be resolved to an installable set of packages. Problem 1 - contao/manager-bundle 4.13.0 requires contao/core-bundle 4.13.0 -> found contao/core-bundle[4.13.0] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.1 requires contao/core-bundle 4.13.1 -> found contao/core-bundle[4.13.1] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.2 requires contao/core-bundle 4.13.2 -> found contao/core-bundle[4.13.2] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.3 requires contao/core-bundle 4.13.3 -> found contao/core-bundle[4.13.3] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.4 requires contao/core-bundle 4.13.4 -> found contao/core-bundle[4.13.4] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.5 requires contao/core-bundle 4.13.5 -> found contao/core-bundle[4.13.5] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.6 requires contao/core-bundle 4.13.6 -> found contao/core-bundle[4.13.6] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.7 requires contao/core-bundle 4.13.7 -> found contao/core-bundle[4.13.7] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.8 requires contao/core-bundle 4.13.8 -> found contao/core-bundle[4.13.8] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.9 requires contao/core-bundle 4.13.9 -> found contao/core-bundle[4.13.9] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.10 requires contao/core-bundle 4.13.10 -> found contao/core-bundle[4.13.10] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.11 requires contao/core-bundle 4.13.11 -> found contao/core-bundle[4.13.11] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.12 requires contao/core-bundle 4.13.12 -> found contao/core-bundle[4.13.12] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.13 requires contao/core-bundle 4.13.13 -> found contao/core-bundle[4.13.13] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.14 requires contao/core-bundle 4.13.14 -> found contao/core-bundle[4.13.14] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.15 requires contao/core-bundle 4.13.15 -> found contao/core-bundle[4.13.15] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.16 requires contao/core-bundle 4.13.16 -> found contao/core-bundle[4.13.16] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.17 requires contao/core-bundle 4.13.17 -> found contao/core-bundle[4.13.17] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.18 requires contao/core-bundle 4.13.18 -> found contao/core-bundle[4.13.18] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.19 requires contao/core-bundle 4.13.19 -> found contao/core-bundle[4.13.19] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.20 requires contao/core-bundle 4.13.20 -> found contao/core-bundle[4.13.20] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.21 requires contao/core-bundle 4.13.21 -> found contao/core-bundle[4.13.21] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.22 requires contao/core-bundle 4.13.22 -> found contao/core-bundle[4.13.22] but it conflicts with your root composer.json require (^5.3). - contao/manager-bundle 4.13.23 requires contao/core-bundle 4.13.23 -> found contao/core-bundle[4.13.