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jj is a Git-compatible version control system that is both simple and powerful. See the installation instructions to get started.

Switched to the mimalloc memory allocator for better multi-threaded performance.

The following deprecated command options have been removed:
- jj commit --reset-author/--author
- jj describe --no-edit/--edit/--reset-author/--author
- jj git push --allow-new
- jj metaedit --update-committer-timestamp
The following deprecated config options have been removed:
- git.auto-local-bookmark
- git.push-new-bookmarks

jj evolog no longer supports legacy commit predecessors recorded in jj < 0.30.

Shell completions now surface descriptions for custom aliases, revset-aliases, template-aliases, and fileset-aliases. Descriptions are extracted from the .doc field of the alias definition if it is a table with .doc and .definition properties.
jj show now accepts multiple revisions, showing all of them one after the other, behaving closer to git show.
jj git fetch now generates evolution history based on change IDs. If change IDs are preserved by the remote, local descendant revisions will be rebased onto the rewritten parents.
Added jj util backend name command that prints the commit backend being used in the current repo.
Added edit-invocation-mode config option for diff editors (e.g. jj diffedit, jj split). When set to "file-by-file", the editor is launched once per changed file, making it possible to use per-file tools like vimdiff for editing.

jj git remote add now reports an error instead of panicking when the remote name is empty or contains whitespace. #9099
Color-words diffs are now shown as separate before and after lines when color output is disabled, making piped or redirected diffs readable. #5894
jj bookmark forget no longer prints Forgot N local bookmarks. when no local bookmarks were actually forgotten (e.g. when only an untracked remote bookmark matched). #9181.
The builtin_log_redacted template now also redacts workspace names.

Thanks to the people who made this release happen!