No macOS update after 10.14.3 on early 2015 MacBook Pro? I have a MacBook Pro (Retina, 13-inch, Early 2015) 3.1 GHZ i7 (16 GB memory, ~380GB diskspace left). It is currently running Mojave 10.14.3. It seems like the latest version is actually 10.14.6, but when I go to System Preferences &gt; Software Update... it says "Your Mac is up to date". (Under Advanced..., every box is ticked.)

Does my Mac not support the newer update? If it does, how do I make it see the update?
Have you tried this 

https://support.apple.com/kb/DL2010?locale=en_US

It allows you to download the dmg and you can try to push manually. I think, your MBP 2015 should support the latest Mojave as you have installed its older version already.