The blueooth packages are part of the OS (Raspbian) - they can be upgraded if a new version is released by the upstream Raspbian project and can be installed with the apt utility, or just choosing to update your OS packages from RetroPie-Setup when you do an upgrade.
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first