By default Pi-Hole updates it's block lists once a week.
Broadly speaking, this is fine for blocking Ad domains (although the recent trend towards advertisers generating new domains does undermine that a bit).
But, if you've added a Phishing block list (as detailed in Building Your Own DNS over HTTPS Server), this is far less optimal - Phishing domains tend to do the majority of their damage during the first 24 hours, so only getting an update into the blocklist (potentially) 7 days later isn't much use.
In this post we'll walk through the (simple) procedure to have Pi-Hole update the gravity lists more frequently
Gravity updates are triggered via cron, in /etc/cron.d/pihole
grep updateGravity /etc/cron.d/pihole 26 3 * * 7 root PATH="$PATH:/usr/local/bin/" pihole updateGravity >/var/log/pihole_updateGravity.log || cat /var/log/pihole_updateGravity.log
As that crontab is a core file within Pi-hole we're not going to edit that file, otherwise any changes we make would be lost the next time Pi-Hole is updated.
echo '30 */2 * * * root PATH="$PATH:/usr/local/bin/" pihole updateGravity >/var/log/pihole_updateGravity.log || cat /var/log/pihole_updateGravity.log' > /etc/cron.d/update_gravity systemctl restart cron
Lists will now be updated every 2 hours, at 30 mins past the hour.