asdf-nodejs: Can not install nodejs 10.15.3

When running asdf install nodejs 10.15.3 I’ll get the following output:

asdf install nodejs 10.15.3
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  3884    0  3884    0     0   6313      0 --:--:-- --:--:-- --:--:--  6305
gpg: Signature made Tue Mar  5 18:15:03 2019 CET
gpg:                using RSA key 4ED778F539E3634C779C87C6D7062848A1AB005C
gpg: Good signature from "Beth Griggs <Bethany.Griggs@uk.ibm.com>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 4ED7 78F5 39E3 634C 779C  87C6 D706 2848 A1AB 005C
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 15.6M  100 15.6M    0     0  6468k      0  0:00:02  0:00:02 --:--:-- 6469k
sha256sum or shasum is not available for use
Authenticity of package archive can not be assured. Exiting.