```ruby
class Makemkv < Cask
  url 'http://www.makemkv.com/download/makemkv_v1.8.8_osx.dmg'
  homepage 'http://www.makemkv.com/'
  version '1.8.8'
  sha256 '3781cc41523417bd87d44177ed5d3943d8e37f18d8c398f90d799a76f4761dcd'
  link 'MakeMKV.app'
end
```

Update MakeMKV to version 1.8.9
user
```ruby
class Makemkv < Cask
  url 'http://www.makemkv.com/download/makemkv_v1.8.9_osx.dmg'
  homepage 'http://www.makemkv.com/'
  version '1.8.9'
  sha256 '9a854fb40b035c77e470ae523692243eb8f7d13485fb57a1e760f5f519cd705b'
  link 'MakeMKV.app'
end
```
assistant