# Jujutsu v0.40.0

- Product: Jujutsu (https://whatsnew.fyi/product/jujutsu)
- Vendor: jj-vcs
- Date: 2026-04-02
- Version: v0.40.0
- Original notes: https://github.com/jj-vcs/jj/releases/tag/v0.40.0
- Permalink: https://whatsnew.fyi/product/jujutsu/releases/v0.40.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — New `diff_lines_added()` and `diff_lines_removed()` revset functions for matching content on only one side of a diff
- **added** — The `end` parameter in the `String.substr(start, end)` templating method is now optional, returning from `start` to the end of the string if not given
- **added** — `WorkspaceRef` templates now provide a `.root()` method to show the absolute path to each workspace root
- **added** — The `jj arrange` TUI now includes immediate parents and children, dimmed by default and not selectable
- **changed** — `jj arrange` uses the default log template (`builtin_log_compact`) instead of the shorter commit summary style
- **changed** — In the `jj arrange` TUI, the "swap up/down" actions now move along graph edges even if the commit rows are not adjacent
- **added** — Diff colors can now be configured differently for each format
- **added** — `jj op log` now includes the name of the workspace the operation was created from
- **changed** — The `config()` template function now accepts a `Stringify` expression instead of `LiteralString` to allow looking up configuration values dynamically
- **changed** — `jj op show`, `jj op diff`, `jj op log -p` now only show "interesting" revisions by default defined by `revsets.op-diff-changes-in`, with a new `--show-changes-in` flag to override this
- **fixed** — `.gitignore` with UTF-8 BOM can now be parsed correctly
- **fixed** — Fix incompatibility with gpgsm 2.5.x

###### About

jj is a Git-compatible version control system that is both simple and powerful. See
the [installation instructions](https://jj-vcs.github.io/jj/v0.40.0/install-and-setup/) to get started.

###### Release highlights

None

###### Breaking changes

None

###### Deprecations

None

###### New features

* New `diff_lines_added()` and `diff_lines_removed()` revset functions for
  matching content on only one side of a diff.

* The `end` parameter in the `String.substr(start, end)` templating method is
  now optional. If not given, `substr()` returns from `start` to the end of the
  string.

* `WorkspaceRef` templates now provide a `.root()` method to show the absolute
  path to each workspace root.

* The `jj arrange` TUI now includes immediate parents and children. They are not
  selectable and are dimmed by default.

* `jj arrange` uses the default log template (`builtin_log_compact`) instead of
   the shorter commit summary style.

* In the `jj arrange` TUI, the "swap up/down" actions now move along graph edges
  even if the commit rows are not adjacent.

* [Diff colors](docs/config.md#diff-colors-and-styles) can now be configured
  differently for each format.

* `jj op log` now includes the name of the workspace the operation was created
  from.

* The `config()` template function now accepts a `Stringify` expression instead
  of `LiteralString`. This allows looking up configuration values dynamically.

* `jj op show`, `jj op diff`, `jj op log -p` now only show "interesting"
  revisions by default (defined by `revsets.op-diff-changes-in`). A new flag,
  `--show-changes-in`, can be used to override this. [#6083](https://github.com/jj-vcs/jj/issues/6083)

###### Fixed bugs

* `.gitignore` with UTF-8 BOM can now be parsed correctly.

* Fix incompatibility with gpgsm 2.5.x.

###### Contributors

Thanks to the people who made this release happen!

* Aaron Sutton (@aaronjsutton)
* Adam Sandberg Eriksson (@adamse)
* Anton Älgmyr (@algmyr)
* Austin Seipp (@thoughtpolice)
* Benjamin Tan (@bnjmnt4n)
* Ben Warren (@warrenbhw)
* Bryant Chandler (@brychanrobot)
* David Higgs (@higgsd)
* Filip Weiss (@fiws)
* Gabriel Goller (@kaffarell)
* Gaëtan Lehmann (@glehmann)
* Ilya Grigoriev (@ilyagr)
* Jeff Turner (@jefft)
* Joseph Lou (@josephlou5)
* Josh Steadmon (@steadmon)
* KITAGAWA Yasutaka (@kit494way)
* Liam (@terror)
* Li-Wen Hsu (@lwhsu)
* Martin von Zweigbergk (@martinvonz)
* Philip Metzger (@PhilipMetzger)
* Poliorcetics (@poliorcetics)
* Remo Senekowitsch (@senekor)
* Rob Pilling (@bobrippling)
* Scott Taylor (@scott2000)
* Shnatu
* Stephen Prater (@stephenprater)
* Yuya Nishihara (@yuja)
* Zeyi Fan (@fanzeyi)