How to wean baby off bottle?

So my daughter is 21 months. Shes usually a great sleeper. Lately shes been waking up just for her bottle. She sleeps in her crib in her own room. She falls right back to sleep as soon as I fill up her bottle and give it to her. Any suggestions on how to have this stop. I know it’s a very mild inconvenience, but it has me waking up sometimes 3 times a night to settle her back. Do u think it’s time to ditch the bottle?