DNSSEC error resolving gpo.gov ?

[Stephane Bortzmeyer]

On Tue, Mar 14, 2023 at 11:08:28AM -0400,
 Alexandra Yang <drayales at gmail.com> wrote 
 a message of 154 lines which said:

> I wonder if anyone can shed some light on this, our nameserver(BIND
> 9.16.37 )keeps giving error on resolving gpo.gov and ns3.gpo.gov,
> here are the
> errors:

"DS record for zone gpo.gov with keytag 18496 was created by digest
algorithm 1 (SHA-1) which is deprecated."
https://zonemaster.fr/en/result/9161c8485223705c