[kronolith] update to 4.2.0 failed

[Johannes Mock]

Hello together

I tried to upgrade kronolith from 4.1.5 to 4.2.0alpha2, and got the
following message:

# pear -d preferred_state=alpha upgrade -a horde/kronolith
horde/kronolith is already installed and is the same as the released
version 4.1.5
upgrade failed

Is there another way to upgrade to 4.2.0alpha2 or at least 4.2.0alpha1.

Best regards
Johannes Mock