Simple RAW for 5e V: The Disadvantage Strikes Back

[Galithar]

Q28 are cantrips level dependent in regard to their damage?

A28
Yes that are. Cantrips increase in damage according to the spell description. They follow a pattern of increasing at levels 5, 11, and 17. Usually by increasing the number of damage dice rolled by one. At least one (magic stone) doesn't increase, so be sure to consult the spell description.

Edit: Note that these scale by character level, not class level. A Wizard 2/Fighter 3 has cantrips as if they are 5th level, typically 2 damage dice.