```ruby
class Makemkv < Cask
  version '1.8.11'
  sha256 '6551e167079d49c4bc414ce9494afae2857338ea5fbcd2ed63d705d2313b48a6'

  url 'http://www.makemkv.com/download/makemkv_v1.8.11_osx.dmg'
  homepage 'http://www.makemkv.com/'

  link 'MakeMKV.app'
end
```

Update MakeMKV to version 1.8.12
user
```ruby
class Makemkv < Cask
  version '1.8.12'
  sha256 '06a7868764871cbf9b1db90def501bee1f4563a7c9bc54f2b1dab2302317aef0'

  url 'http://www.makemkv.com/download/makemkv_v1.8.12_osx.dmg'
  homepage 'http://www.makemkv.com/'

  link 'MakeMKV.app'
end
```
assistant