[packetlost]

C doesn't seem to have substantially changed in 20+ years.

[flohofwoe]

The C99 changes were pretty radical, but couldn't be broadly used until around 2016 when the Microsoft compiler finally caught up and started to implement the most important C99 features.

[kevin_thibedeau]

C11 provides a lot of useful goodies too. I don't relish the idea of writing C89 and giving up all the improvements.

[RobotToaster]

C23 adds support for type inference.

[kahrl]

It has.