To downgrade gnupg with homebrew to version 2.2.21, run the following.
brew tap xvfionn/tap
brew install [email protected]
# This may produce some errors, that's ok
brew link --overwrite [email protected]
Test it by checking the output of gpg --version.
To reinstall the latest version from homebrew, run the below commands.
brew unlink gnupg
brew unlink [email protected]
brew link gnupg