Inspect Element Tool Showing Wrong WordPress Version

I know that the Inspect Element tool within the browser can be used to verify the version of WordPress that a site currently uses. However, my site has recently been updated to WordPress version 5.5.1 from 5.4.2, but the one of the meta tags in the header has a generator attribute which still shows the version as 5.4.2.
Any possible reasons why this may be happening?