Please follow the below template, it will help us to help you!
Expected Behaviour:
after pihole -up update pihole
Actual Behaviour:
pi@rasperrypi:~ $ pihole -up
[i] Checking for updates...
[i] Pi-hole Core: up to date
[i] Web Interface: update available
curl: (22) The requested URL returned error: 404 Not Found
[i] FTL: update available
[i] Pi-hole Web Admin files out of date, updating local repo.
[✓] Check for existing repository in /var/www/html/admin
[i] Update repo in /var/www/html/admin...
: Could not update local repository. Contact support.