Strollers for toddlers

Ka

So this may be a dumb question but is it worth getting a new stroller for my 20 month old? We are still using the stroller that came with her infant seat. Right now she's unable to sit up all the way straight as the back of the stroller doesn't sit up right any further. Google said they shouldn't be in strollers past 3. I'm not sure if it's worth buying a new one for a year