Run locate.updatedb nightly, not weekly?

man locate.updatedb says that the database for locate is updated weekly. That is confirmed by /System/Library/LaunchDaemons/com.apple.locate.plist, which has Weekday 6 To run nightly instead of only on that weekday, as root I tried to remove that part: plutil -remove StartCalendarInterval.Weekday /System/Library/LaunchDaemons/com.apple.locate.plist But that failed, "Operation not permitted," with no further explanation. How can I cause updatedb to run nightly? Sequoia 15.0.1, macbook pro, M3 pro.