Need Help flashing 4.4.4 To AT&T HTC One M8. topic

I have an HTC One M8 AT&T Branded but it has 4.4.2 on it and i wanna flash viperrom 3.2.1 but it requires androids 4.4.4 software. im S-ON, 3.16 Bootloader with 1.58.502.1 Software number. Baseband Version is 1.16.21331931.LA11G_20.31A.4145.02L. im just looking to Update from 4.4.2 to 4.4.4 but i cant seem to find out how. Any help would be great.