```ruby
class FontPtSerif < Cask
  version '1.001'
  sha256 '74eec886edb58899018448e69cfab7032dd2ce8ff69a44c18f88a7d2a7bf3b26'

  url 'http://www.fontstock.com/public/PTSerif.zip'
  homepage 'http://www.paratype.com/public/'
  license :ofl

  font 'PTF55F.ttf'
  font 'PTF56F.ttf'
  font 'PTF75F.ttf'
  font 'PTF76F.ttf'
  font 'PTZ55F.ttf'
  font 'PTZ56F.ttf'
end
```

Update PT Serif to 1.002
user
```ruby
class FontPtSerif < Cask
  version '1.002'
  sha256 '7a6f5fd596307a3f1b145c2383f7ae61abc417e7f8d5ba068295ef1c182a7474'

  url 'http://www.paratype.com/uni/public/PTSerif.zip'
  homepage 'http://www.paratype.com/public/'
  license :ofl

  font 'PTF55F.ttf'
  font 'PTF56F.ttf'
  font 'PTF75F.ttf'
  font 'PTF76F.ttf'
  font 'PTZ55F.ttf'
  font 'PTZ56F.ttf'
end
```
assistant