Bullseye refuses to install

The installation of the package rhasspy_amd64.deb (2.5.11) fails with Bullseye because the dependent package libgfortran4 cannot be installed.
The libgfortran5 package is used in Bullseye.
Regards Jens

p.s. I have corrected the dependency in the package:
wget https://github.com/rhasspy/rhasspy/releases/latest/download/rhasspy_amd64.deb
dpkg-deb --extract rhasspy_amd64.deb tmp
dpkg-deb --control rhasspy_amd64.deb tmp/DEBIAN
sed -n -i ‘s/libgfortran4/libgfortran5/gp’ ./tmp/DEBIAN/control
dpkg --build tmp rhasspy_amd64.deb
dpkg -i ./rhasspy_amd64.deb

sorry, sed is wrong
sed -i 's/libgfortran4/libgfortran5/' ./tmp/DEBIAN/control

Thank you so very much for getting back to me so soon!! Just for those that follow, make sure you delete the “control” file created in tmp if you’ve follow the previous instructions, and then restart the process at:
dpkg-deb --extract rhasspy_amd64.deb tmp.