I’m assuming that the operating system is current at 5.10 and the reading of 5.9 should probably have been 5.09? I don’t want to go backwards. Are we counting like…
5.9 = 5.09
5.10
5.11
5.12
The dot isn’t a decimal point, it’s a divider between the major version number and the minor version number.
The minor number was 9 (nine), so the next one is 10 (ten).
It’s basic software versioning.