How do young players get better?

[bgl216]

I am about 15 games into my franchise that i built with very young players. For example (Bryce Harper, Anthony Rizzo, Wil Myers, & Starlin Marte). Most of these players have 5 star potential. None of them have gained any points in their rating, or earned additional stars. Do you know how this is done? Do i need to change something in the settings? Is it possible for players ratings to increase throughout the franchise season, or do they earn stars? Thanks for the help!!

[KleShreen]

Their ratings don't change until the off-season.

[bbentle]

Yah, that happened to me in a different season.

[HammerOfGod]

Players only progress during the offseason, except for hot and cold streaks which give them bumps a week at a time. You'll see those after the first month of the season.

Players never gain potential however.