Currently, 20161029 is packaged, but upstream, 20171227 is now available. There don't seem to be many major changes, except that they added an explicit soversion at 1, which would be a bump for us.
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Moving to Rawhide so it doesn't close, but it's outdated everywhere.
This bug appears to have been reported against 'rawhide' during the Fedora 29 development cycle. Changing version to '29'.
mbroz's argon2-20171227-1.fc31 completed http://koji.fedoraproject.org/koji/buildinfo?buildID=1234906