Fedora silverblue38: flatpak update fails

[pippo@fc38sb ~]$ sudo flatpak update
Looking for updates…

    ID                                   Branch          Op          Remote          Download
  1. org.fedoraproject.Platform           f38             u           fedora          < 910.3 MB
    

Proceed with these changes to the system installation? [Y/n]:
error: Failed to execute child process “dbus-launch” (No such file or directory)

Try without sudo. It’s not necessary.