You can change your book’s slug by going here in the Leanpub menu:

Author > Books > [Your Book Title] > Book Web Page > Web Page URL

If your book is published, the old URL will redirect to the new URL. We do not redirect URLs when you change the URL for an unpublished book.

This change will not affect current readers of your book, i.e. existing readers will still get updates etc. as usual.

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