Diary of a Wimpy Kid: Book 21 is the upcoming twenty-first book in the Diary of a Wimpy Kid series. It will likely release on October 20 or October 27, 2026.
On October 26, during preparations for a night of The Partypooper Tour, the official Instagram account confirmed that they were currently trying to brainstorm a theme for the book - and briefly invited followers to suggest a theme.
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- Whilst an October release is currently likely, it is currently unknown whether the book will be released on October 20 or October 27, as there may be a push for a later release date.
- We will probably find out the release date in around January or February, when the teaser cover is usually released.
