But, what version of the OS do you have? The Window 10 Mobile OS support ended this year. I'm not sure if it means that you can't update anymore doesn't matter the version of the OS you have. Or if it means that you can always update to the last version released at the moment of the end of support, but you don't get new updates anymore.
So, in my opinion (I didn't try it), you should be able to update to the last W10M OS version released. Check if you have it, and then, you can't expect a new one.