There will be smaller-sized paperback versions to make it easier to carry Harry with you everywhere.

Special versions of The Prisoner of Azkaban will also go on sale in time for the release of the film in June.

Bloomsbury has made millions out of record sales of Potter, but it says it is still trying to attract the many shy adults who have not been hooked in yet.

Newsround told you about new covers for the adult books in January, but the publisher hopes more grown-ups will go for the adult hardback versions too, which will be out for the first time this year.

It's hard to believe, but Bloomsbury said there are still so many adults who are too chicken to be seen with a Potter book.

Record-breaking sales of JK Rowling's fifth book, Order of the Phoenix - which also comes out in paperback in July - helped the publisher make a lot of money in 2003.

And JK herself became the richest woman in the UK last year because of her books.