How to update from Drupal core 8.5.0 to 8.5.5?


In the past (Drupal 7), security-only update via drush was simple as:

drush up --security-only

now, Drush 9.3 returns:

Command “up” is ambiguous.
Did you mean one of these?

composer does not help either:

composer outdated drupal/*

returns nothing.

In fact, my Drupal is outdated:

How can I update Drupal security updates via command line?

UPDATE (composer prohibits):

$ composer prohibits drupal/core:8.5.5
There is no installed package depending on "drupal/core" in versions not matching 8.5.5

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