To Kill a Mockingbird sales double

Australian sales of the classic novel To Kill a Mockingbird have doubled on the news a sequel will be released.

Gregory Peck is shown in a scene from the film "To Kill a Mockingbird", based on the book whose sequel has been released. (AAP) Source: AP

American literary classic To Kill a Mockingbird is enjoying a revival among Australian readers following news of a sequel.

Go Set a Watchman, the follow-up to Harper Lee's 1960 novel, was announced last week.

Dymocks buying manager Sophie Higgins says To Kill a Mockingbird sales have doubled since the announcement, and many adults are re-reading the Pulitzer Prize-winning novel.

"What I'm seeing on social media is a lot of people in their 20s to 30s who are saying they have to go back and read this book," Ms Higgins said on Tuesday.

"These figures certainly bode well for the release of Go Set a Watchman later in the year."

Dymocks says To Kill a Mockingbird has sold more than 1000 copies since the beginning of the year, compared with 6803 in 2014.

The sequel will be released on July 14.