All forms of Guinness - including draft, cans, and bottles - are now suitable for vegans.
Guinness used to be filtered with isinglass (fish swim bladders) but the company announced back in 2015 that it would be using implementing a new filtration system that was veg-friendly.
By April 2017, draft Guinness was suitable for vegans - but bottles and cans still contained isinglass.
In a statement, Guinness manufacturer Diageo said: "Our new filtration process has removed the use of isinglass as a means of filtration and vegans can now enjoy a pint of Guinness."
According to Diego, the recipe hasn't changed - just the filtration method.