Update Repository (Debug)

When I try to update my new Leap 15.3 system by invoking "zypper patch" or "zypper up", the following warning message appears:        Repository 'Update Repository (Debug)' appears to be        outdated. Consider using a different mirror or server. For suppressing the warning message, I have inactivated this repository in yast. But I am looking for a better solution. On the site http://download.opensuse.org/repositories/, I did not find anything appropriate. Is there a better site available? And if so, what is its URL? Thank you in advance. Best regards, Wolfgang