WordPress version 5.1 is here, you can find the details here https://wordpress.org/support/wordpress-version/version-5-1/ . If you are using an older version of WordPress, I suggest you upgrade as soon as possible.
Before you upgrade, always verify the plugins that you have installed are compatible. An upgrade to the outdated plugins may require. Do a backup of your WordPress website before the upgrade.
It is a common mistake made, the users backup the WordPress files only. WordPress website is a database CMS. Content updates are changes in the database table, thus making a database dump / backup is important.
Without the latest database backup, you have a high chance of getting a broken website during restoration