Ruby 3.2.5 with fpm-cookery 0.37.0 has uninitialized constant

[aalmenar]

/opt/rbenv/versions/3.2.5/lib/ruby/gems/3.2.0/gems/fpm-cookery-0.37.0/lib/fpm/cookery/utils.rb:89:in `patch': uninitialized constant FPM::Cookery::Utils::Fixnum (NameError)

this is on a recipe where patch iscalled:

def build
    patch(workdir("patches/0001-fixes_null.patch"), 1)

Cant find the reason why is not working, since with ruby 3.1.x worked, but after upgrading to 3.2.x it broke.