Updating core to a specific version with Composer My site hasn't been updated for two months, a few new updates has been released. 
My site's core version is 8.5.6.
Before running composer update -with-dependencies I read the release notes to the latest version of core (8.6.2), they say:


  Sites on 8.5.x should update immediately to Drupal 8.5.8 instead, and
  plan to update to the latest 8.6.x release before May 2019.


How do I update the old core to Drupal 8.5.8 instead? 
How do I specify that version in CLI, what command?
Eventually I want to update it to the latest version.
I was in the same position. I used : 

composer require drupal/core:^8.5.10


And it worked. Cheers.