How to hide dns version on ispconfig

Hello, how to hiden dns version on ispconfig, i am using debian stretch.

Message from dnsstuff:
One or more nameservers responded to version queries. This can be considered a breach of security. If a malicious person or
program had access to a version-specific exploit for your DNS server, displaying the version info openly will make their attack much
easier. This should be removed or obscured. The nameservers that responded to version queries are:
190.181.152.137 responded with "9.10.3-P4-Debian"
190.181.152.136 responded with "9.10.3-P4-Debian"

Thanks.

 

add
version "whatever you want";

to /etc/bind/named.conf.options and restart bind

 

Thanks.