HBO has renewed its hit fantasy drama Game of Thrones for a fifth and sixth season.

The renewal comes on the heels of a record-breaking fourth season premiere April 6, with the series garnering 6.6 million viewers. That made the premiere episode HBO’s most-watched program since The Sopranos’ series finale in 2007. Two replays of the Thrones episode propelled the full-night tally up to 8.2 million viewers.

Game of Thrones is a phenomenon like no other,” said Michael Lombardo, president, HBO Programming, in a statement. “David Benioff and D.B. Weiss, along with their talented collaborators, continue to surpass themselves, and we look forward to more of their dazzling storytelling.”

For EW’s Game of Thrones season premiere coverage, see our recap, “A Storm of Swords and Swingers,” and our interview with actress Maisie Williams and the showrunners on Arya’s dark twist. Keep up with Game of Thrones news: Sign up for EW’s new email Thrones newsletter. Game of Thrones airs Sundays at 9 p.m. on HBO.