Upgrading to the latest minor or patch version is (almost) as simple as running:
composer update
If there are schema changes in the changelog, you will also need to run the migration scripts to update your database. This is all handled for you.
vendor/bin/doctrine-migrations migrate
You can safely run this command whether there are migrations or not, so if you are not sure what version you are currently running, it may be best to run it every time you upgrade anything beyond a patch.

Version 1.9 deprecated footerText in the Theme entity. This is now set in the admin so you should remove this function call if you have set a custom theme.

Version 1.14 contains enhancements to the .htaccess file that you may want to copy into youe local project.
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Upgrading to 1.9
Upgrading to 1.14