```ruby
class TheUnarchiver < Cask
  url 'http://theunarchiver.googlecode.com/files/TheUnarchiver3.7.zip'
  homepage 'http://unarchiver.c3.cx/'
  version '3.7'
  sha1 'da29b9f591d299cf1f869b7c77aac38908748ad5'
  link 'The Unarchiver.app'
end
```

Update The Unarchiver to v. 3.8
user
```ruby
class TheUnarchiver < Cask
  url 'http://theunarchiver.googlecode.com/files/TheUnarchiver3.8.zip'
  homepage 'http://unarchiver.c3.cx/'
  version '3.8'
  sha1 'd4fca3f358df80dff6cccb67de2f5766a6d51d9f'
  link 'The Unarchiver.app'
end
```
assistant