Apple on Monday lodged an appeal to challenge a U.S. judge’s ruling that ordered the tech company to immediately open its lucrative App Store to more competition.

Last week a federal judge issued a scathing ruling over Apple’s handling of fees for in-app transactions. As promised, Apple has appealed the latest decision in the protracted lawsuit brought by Epic Games over the company’s anti-competitive App Store policies.

After a stinging rebuke in the lower courts over its legal battle with Epic, Apple filed a notice of appeal to the Ninth Circuit on Monday. The appeal will challenge last week’s ruling that prevents the company from charging developers fees on purchases made outside the App Store.