Firmware Bug update microcode to version: 0x22 (or later [2] Fixed

I installed the CentOS rpm:

Firmware Bug update microcode to version: 0x22 (or later

I have a [Firmware Bug]: TSC_DEADLINE disabled due to Errata; please update microcode to version: 0x22 (or later). This diagnostic is displayed during boot and is recorded in /var/log/dmesg . How does one obtain the necessary microcode? For Ubuntu and presumably other .deb based