Juveniles convicted of certain crimes can no longer automatically be sentenced to life in prison without the possiblity of parole.
Governor Rick Snyder signed legislation changing the sentencing procedures on Tuesday.
The governor's office said this brings Michigan in line with national standards.
Senate Bill 319, sponsored by Sen. Rick Jones, creates a new sentencing process for pending and future cases involving juvenile defendants.
A juvenile convicted of first degree murder, felony murder or a repeat offender in certain sexual assault cases can no longer automatically be sentenced to life without parole.
"These changes will ensure Michiganders of all ages receive a fair trial while aligning our state justice system with federal law," Snyder said.