George R.R. Martin gave fans an update on his book "The Winds of Winter," and unfortunately it wasn't good news. The author of the books that make up HBO's "Game of Thrones" posted on his LiveJournal blog Saturday that he's not sure when his new book will be hitting store shelves.

“You wanted an update. Here’s the update. You won’t like it,” he wrote. “’The Winds of Winter’ is not finished.” 

He continued, “Believe me, it gave me no pleasure to type those words. For months now I have wanted nothing so much as to be able to say, I have completed and delivered ‘The Winds of Winer’ on or before the last day of 2015. But the book’s not done. Nor is it likely to be finished tomorrow, or next week.” 

Martin blamed the delay on his missing two deadlines — one in October and the other before the end of 2015.

“I tried, I promise,” he wrote. “I failed. I blew the Halloween deadline, and I’ve now blown the end of the year deadline. And that almost certainly means that no, ‘The Winds of Winter’ will not be published before the sixth season of ‘Game of Thrones’ premiere in April (mid-April, we are now told, not early April, but those two weeks will not save me).” 

The 67-year-old writer previously told Entertainment Weekly that he really wanted to have “The Winds Of Winter” — the sixth book in his “Of Ice And Fire” series — published before Season 6 of "Game of Thrones" kicked off. He also teased that he added a big twist in the book for one longtime character.

"This is going to drive your readers crazy," he said. "But I love it. I'm still weighing whether to go that direction or not. It's a great twist."

Even though Martin isn't sure when his book will be completed, fans can rest assured that the new season of the show will tie up loose ends from Season 5. Director Jeremy Podeswa previously said Season 5 “gets off to an amazing start” and “the first two episodes are really strong.”