WordPress 4.9.5 is now available. This is a security and maintenance release for all versions since WordPress 3.7. You need to update your site(s) immediately.
WordPress versions 4.9.4 and earlier are affected by three security issues.
While WordPress.org already started automatic background updates that do not require you to do anything it may take some time for them to get to your website. If it does not update automatically today, do it yourself (if you are confident enough) or contact Dusk Owl for help.