WP admin style not refreshing

A more standard way to enqueue stylesheets in WP admin is to use wp_enqueue_style function on admin_enqueue_scripts hook.

if I do any changes afterwards it doesnt update

This sounds like a browser cache isssue. You can bust the cache by adding a dynamic version number parameter to the stylesheet url with the native php function filemtime. It returns the unix time when the file was last changed. Like so,

// add to functions.php
function my_prefix_add_admin_styles() {
  wp_enqueue_style( 'my_admin_styles', get_stylesheet_directory_uri() . '/wp-admin.css', false, filemtime( get_stylesheet_directory() . '/wp-admin.css' ) );
}
add_action( 'admin_enqueue_scripts', 'my_prefix_add_admin_styles' );