Composer update / prohibits (core + modules) till D8.6.11
composer outdated drupal/* composer show drupal/*
This manual works till version D8.6.11 (8.6.11 and higher require twig 1.38.2), so need at first update twig to this version with:
composer require 'twig/twig:1.38.2'
Composer prohibits - zobrazí závislosti, kvôli ktorým update zlyhá:
composer prohibits drupal/core:8.6.15
Composer update - update modulov podla composer.json