The next major update would point to 5.0 which is not in any pipeline yet. So please switch to the next patch (3.10+4.0) or next minor (4.1) in the mean time.

@zero-24 ok, I will switch to "next patch", but maybe it will be better to update link on page https://developer.joomla.org/nightly-builds.html ?

I mean 4.1 and write properly link in 4.0.

Ups yes we planed to change the plugin but It seems it got missed in the process and with much less sleep than recommended ;)

joomla/developer.joomla.org#44

Will also later check the update server itself as the file is not gone yet while it should be removed from there.

Ok so the next_major update servers should be gone by the next sync of the CDN.

https://docs.joomla.org/J3.x:Joomla_3.10_points_to_4.0_while_it_claims_to_be_on_the_Default_update_server

Ok, so it's time to merge joomla/developer.joomla.org#44 and update https://developer.joomla.org/nightly-builds.html - write new xml to 4.1-dev like next_minor_list.xml

When it happens, I will close issue :)

Yes its still on my radar but i have not yet had the time to fix it yet.

We are awaiting @HLeithner to merge the PR and deploy it to the site. I have removed the old update servers from the CDN already.

should be fine now.

Thanks @HLeithner