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The WordPress version couldn't be determined.
Maybe your site is using a security plugin which hides the version. If you use such a plugin keep it activated and check your WordPress version directly within wp-admin.
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Current WordPress version: 5.0.3
That's a call to action!
Update your site as fast as possible. Using old versions of WordPress is a security-risc. Create a backup of your database and files. Check if all plugins you use are compatible with the current WordPree version. Set your site to maintainance mode. Install the new WordPress version. Disable maintainance mode.
Wonderfull, you don't have to do anything.
But keep in mind: you should also check your installed plugins. Old plugins are one of the highest riscs for your WordPress system.
How it works
Normally your WordPress site tells its version to every visitor. It's written down several times in the source code of your website. This version number can be read easily by any visitor (and this tool).
9180 WordPress sites have been tested
About 66% of the tested sites weren't up to date and had to be updated. Round about 34% were up to date.