/opt/pihole/updatecheck.sh: line 47: jq: command not found

Core: v5.12
Web: v5.14.2
FTL: v5.17

Since latest upgrade I receive mails with the content:

/opt/pihole/updatecheck.sh: line 47: jq: command not found
/opt/pihole/updatecheck.sh: line 51: jq: command not found
/opt/pihole/updatecheck.sh: line 55: jq: command not found

jq was not installed. Should it be a dependency of pihole?

Buster on armv7 (bananapi)