Island Records announced Monday "Lioness: Hidden Treasures" is to go on sale Dec. 5.
"It quickly became apparent to [music producers Mark Ronson and Salaam Remi] that they had a collection of songs that deserved to be heard, a collection of songs that were a fitting testament to Amy the artist and, as importantly, Amy their friend," the label said.
E! News reported the album will include new songs, covers of classics and alternative versions of some her hits.
"If the family had felt that this album wasn't up to the standard of 'Frank' and 'Back to Black,' we would never have agreed to release it, and we believe it will stand as fitting tribute to Amy's musical legally," E! quoted Winehouse's father Mitch as saying of the posthumous third album.
Winehouse died of accidental alcohol poisoning during the summer. She was 27.