It takes PMI usually 4-6 months after a new PMBOK Guide is published to update and adjust the CAPM. So if you take your CAPM exam in 2021 it will be on the Sixth edition.
I just purchased the course a couple of weeks ago and I just saw that the new PMBOK Guide is coming out in August 2021. Will my exam have the new content or will my exam be on the sixth edition?
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®