Since 2018, new versions of Tove Jansson's Moomin books have been published, drawing significant criticism in Sweden for their perceived dilution of the author's voice. Illustrator and writer Jöns Mellgren has been vocal about his disapproval, claiming that the changes made by the Bonnier publishing house completely undermine the essence of authorship. Mellgren argues that Jansson's unique tone has been transformed into 'bland functional prose' due to the removal of numerous atmospheric and evocative passages that originally defined the works.

The debut of these new Moomin books has ignited considerable debate in Sweden, where critics argue that they contribute to the impoverishment of children's literature. Advocating for preserving literary quality and integrity, Mellgren's critique has resonated with many who treasure the original charm and depth of Jansson's writing. Furthermore, his comments highlight a tension between modernization attempts in literature and the need to retain the original work's distinctive qualities.

In contrast to the critique, Bonnier's head Ulrika Caperius defends the publishing decisions, stating that the new editions do not diminish children's culture but rather serve to preserve and nurture it. This ongoing dispute reflects broader conversations about the adaptation of literature for modern audiences, challenging stakeholders in the publishing industry to balance creativity with fidelity to original works.