Series star Danielle Fishel broke the news via Twitter on Thursday.
"Got the great news tonight that #GirlMeetsWorld was picked up for 8 more episodes—a total of 21! Can't wait for everyone to see them all," Fishel wrote.
The show will find Ben Savage and Fishel reprising their roles as Cory and Topanga, now raising their family in New York City. Grown up Cory is a teacher at his daughter Riley's school and Topanga owns a cool after-school hangout spot.
Starring Rowan Blanchard, Ben Savage and Fishel, Girl Meets World will premiere some time in 2014.