In its loss to Epic Games in court, Google has just a few weeks to implement some massive changes in the Play Store and Android.

A US federal court ruled Thursday that Google must open its Android operating system to rival app stores, after the internet giant lost an appeal in an antitrust case filed by Fortnite maker Epic Games.

On Thursday, a three-judge panel affirmed the lower court’s decision in Epic v. Google, according to a full opinion you can read below — and Google will now appeal again, the company confirms to The Verge.