fzf 0.60.3-1 from March 3rd is the latest in Debian, 0.61.1 from April 4 the latest upstream, so Debian is not exactly ancient. I guess you are using stable Debian? That doesn't get newer upstream releases, if you want the latest Debian fzf you can just install the build from unstable, which should work fine since Go does static linking, and there are often backports for when unstable packages can't be installed on stable.

https://github.com/junegunn/fzf/tags https://tracker.debian.org/pkg/fzf