How to update node version

[KhronosPy]

Hi! I'm new at developing. I starting to work with this project, just for fun.
I tried to update react and react-dom to the lastest and it worked well.. except for "node" version, that says is 8.15
I update my node but.. the project still says that is 8.15.
So.. how do i update the node version in the proyect?
I'm using docker and yarn (basically)

[KhronosPy]

I finally figure out