60Hz not available for 4k using DL 5.2.1

[iamjono]

Via my USB-C dock (Targus USB-C Universal DV4K), I have found that I am getting only 4k at 30Hz. Via HDMI 2 I should be getting 4k at 60Hz.

Any ideas why?

Thanks!

[danielmain]

I also get just 30hz in my 4k monitor.

Using Macbook Pro 15" 2018 and connecting just one monitor 4k using display port cable.

Please provide an drive update