macOS update not showing

Hi, I am currently using macOS 10.13.4, and I couldn't find macOS 10.13.5 update in my app store updates page. I tried clearing cache and rebooting, and it still doesn't show up.

There is only a download button on the High Sierra page, but when I click on it, it says "10.13.4 is already installed on this computer. Use the Updates page to install the 10.13.5 update. If you would like to download the full macOS installer, click Continue."

Is there any way to update the macOS instead of downloading the whole system?