Symfony doesnt update minor version fix

If you cannot update your Symfony project to new minor version (for example, from 4.2 to 4.3), and your packages only checks packages only previous versions like this:

The requested package symfony/security-bundle 4.3.4 exists as symfony/security-bundle[4.2.x-dev, v4.2.0, v4.2.0-BETA1, v4.2.0-BETA2, v4.2.0-RC1, v4.2.1, v4.2.10, v4.2.11, v4.2.2, v4.2.3, v4.2.4, v4.2.5, v4.2.6, v4.2.7, v4.2.8, v4.2.9] but these are rejected by your constraint.
  Problem 2
    - The requested package symfony/translation ^4.3 exists as symfony/translation[4.2.x-dev, v4.2.0, v4.2.0-BETA1, v4.2.0-BETA2, v4.2.0-RC1, v4.2.1, v4.2.10, v4.2.11, v4.2.2, v4.2.3, v4.2.4, v4.2.5, v4.2.6, v4.2.7, v4.2.8, v4.2.9] but these are rejected by your constraint.
  Problem 3
    - The requested package symfony/twig-bundle ^4.3 exists as symfony/twig-bundle[4.2.x-dev, v4.2.0, v4.2.0-BETA1, v4.2.0-BETA2, v4.2.0-RC1, v4.2.1, v4.2.10, v4.2.11, v4.2.2, v4.2.3, v4.2.4, v4.2.5, v4.2.6, v4.2.7, v4.2.8, v4.2.9] but these are rejected by your constraint.

it means you should to change extra node in your composer.json file:
"extra": {
        "symfony": {
            "allow-contrib": false,
            "require": "4.3.*"
        }
    }