Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires enshrined/svg-sanitize ^0.16.0, found enshrined/svg-sanitize[0.16.0] but these were not loaded, because they are affected by security advisories ("PKSA-4g5g-4rkv-myqs"). Go to https://packagist.org/security-advisories/ to find advisory details. To ignore the advisories, add them to the audit "ignore" config. To turn the feature off entirely, you can set "block-insecure" to false in your "audit" config. Problem 2 - Root composer.json requires firebase/php-jwt ~5.0, found firebase/php-jwt[v5.0.0, ..., v5.5.1] but these were not loaded, because they are affected by security advisories ("PKSA-2kqm-ps5x-s4f5"). Go to https://packagist.org/security-advisories/ to find advisory details. To ignore the advisories, add them to the audit "ignore" config. To turn the feature off entirely, you can set "block-insecure" to false in your "audit" config. Problem 3 - Root composer.json requires phpoffice/phpexcel ~1.8, found phpoffice/phpexcel[1.8.0, 1.8.1, 1.8.2] but these were not loaded, because they are affected by security advisories ("PKSA-2vt6-y6jz-crs9", "PKSA-n1xd-9q81-6m2k", "PKSA-5bk7-32wt-w1f6", "PKSA-wd5y-fztj-66t8", "PKSA-996h-kvqc-cdky", "PKSA-p4bt-rmgm-ynz5", "PKSA-kxx5-ph1r-5bg2", "PKSA-bx2k-kfb8-w1zm", "PKSA-79jx-g5m1-5ybs", "PKSA-j2jw-2hjb-39hn", "PKSA-yb2q-9cbc-scfr", "PKSA-xzzd-fyzv-1nm2", "PKSA-b7bk-6mnf-vvf4", "PKSA-gn6r-3fbg-vpq7", "PKSA-81dj-mb26-861s", "PKSA-1p4c-ysfb-v9ph", "PKSA-j343-tkpg-k39h", "PKSA-xj88-cdcs-bgkr", "PKSA-s9h9-dzpw-9hsj", "PKSA-hn36-2kk8-hb3y", "PKSA-22dg-9jng-vjc5"). Go to https://packagist.org/security-advisories/ to find advisory details. To ignore the advisories, add them to the audit "ignore" config. To turn the feature off entirely, you can set "block-insecure" to false in your "audit" config. Problem 4 - Root composer.json requires robrichards/xmlseclibs 3.0.*, found robrichards/xmlseclibs[3.0.0, ..., 3.0.4] but these were not loaded, because they are affected by security advisories ("PKSA-pcdf-qvqm-w4tv", "PKSA-9qfh-kpgp-dw7t", "PKSA-2f54-4t85-fzzg"). Go to https://packagist.org/security-advisories/ to find advisory details. To ignore the advisories, add them to the audit "ignore" config. To turn the feature off entirely, you can set "block-insecure" to false in your "audit" config. Problem 5 - Root composer.json requires symfony/http-foundation ~2.8|~3.0, found symfony/http-foundation[v2.8.0, ..., v2.8.52, v3.0.0, ..., v3.4.47] but these were not loaded, because they are affected by security advisories ("PKSA-365x-2zjk-pt47", "PKSA-b35n-565h-rs4q", "PKSA-9w98-4rwq-spxr", "PKSA-324d-pqmd-hptz", "PKSA-nqj4-v43p-2gxc", "PKSA-f8b8-pbjy-s9k8"). Go to https://packagist.org/security-advisories/ to find advisory details. To ignore the advisories, add them to the audit "ignore" config. To turn the feature off entirely, you can set "block-insecure" to false in your "audit" config. Problem 6 - Root composer.json requires symfony/validator ~3.0|~4.0, found symfony/validator[v3.0.0, ..., v3.4.47, v4.0.0, ..., v4.4.48] but these were not loaded, because they are affected by security advisories ("PKSA-w2tw-kmfg-rt9s"). Go to https://packagist.org/security-advisories/ to find advisory details. To ignore the advisories, add them to the audit "ignore" config. To turn the feature off entirely, you can set "block-insecure" to false in your "audit" config. Problem 7 - Root composer.json requires twig/twig 1.*, found twig/twig[1.3.0, ..., v1.44.8] but these were not loaded, because they are affected by security advisories ("PKSA-yhcn-xrg3-68b1", "PKSA-2wrf-1xmk-1pky", "PKSA-6319-ffpf-gx66", "PKSA-n7sg-8f52-pqtf", "PKSA-6cvh-gt46-wq7q", "PKSA-19rw-dqx2-75hc", "PKSA-g1zx-twcw-9z6k"). Go to https://packagist.org/security-advisories/ to find advisory details. To ignore the advisories, add them to the audit "ignore" config. To turn the feature off entirely, you can set "block-insecure" to false in your "audit" config. Problem 8 - Root composer.json