Why is iOS 9.3.5 is the latest software on my iPOD?

What iPod do you have?

iPod models earlier than iPod touch 6th Generation cannot upgrade past iOS 9.3.5.

Here's how to identify what model you have: Identify your iPod model - Apple Support

Mona527 wrote:

I want to upgrade my software to the latest version. But it won't let me go past iOS 9.3.5. Help...

There is no help, you have an outdated ipod, you can't get the latest update.

Only help you'll get it to purchase a newer ipod.