I had this same issue recently. Even though Chrome was fully updated, Gmail was still acting like I was using an older version, and it turned out my Chrome user profile had gotten corrupted. What does update your browser mean in this situation?
Well, even though the browser itself is up-to-date, Gmail was seeing my profile as outdated because something in my local data was off.
Creating a fresh Chrome user profile fixed it right away. So, even if the browser is updated, the local data or user profile might cause issues. Sometimes it’s not the browser version at all but how Gmail interprets your local settings!