apt get update/upgrade

I just ran sudo apt-get update&&sudo apt-get upgrade and got the following
error:

E: Repository 'http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu
bionic InRelease' changed its 'Label' value from 'gimp' to 'gimp stable'
N: This must be accepted explicitly before updates for this repository can
be applied. See apt-secure(8) manpage for details.

please, how do I fix this?
--
:-)~MIKE~(-:
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