# Mermaid 11.17.1

- Product: Mermaid (https://whatsnew.fyi/product/mermaid)
- Vendor: Mermaid
- Date: 2026-08-24
- Version: 11.17.1
- Original notes: https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.17.1
- Permalink: https://whatsnew.fyi/product/mermaid/releases/11.17.1

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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- **fixed** — C4 element labels now wrap to c4.width again after stopping in 11.17.0
- **fixed** — Neo-look arrowheads and crow's-foot markers no longer fall back to default theme colours and stroke widths on the first render with layout: elk
- **fixed** — Class diagram relation markers no longer scale with edge stroke width so they stay outside the class box boundary in themes with strokeWidth: 2

###### Patch Changes

-   [#8092](https://github.com/mermaid-js/mermaid/pull/8092) [`31ce60a`](https://github.com/mermaid-js/mermaid/commit/31ce60a596746c76dc932ab540d910a6c7fff8be) Thanks [@pbrolin47](https://github.com/pbrolin47)! - fix(c4): wrap element labels to `c4.width` again

    C4 element labels (`System`, `Container`, `Component`, `Person` and their `_Ext` variants) stopped wrapping in 11.17.0, so long descriptions rendered on one unbroken line and the shape grew sideways well past the configured `c4.width`. The unified-shapes label helper gated wrapping on the root-level `wrap` option, which has no schema default and is therefore `undefined`; it now gates on `c4.wrap` (default `true`), which is what the legacy renderer used.

-   [#8088](https://github.com/mermaid-js/mermaid/pull/8088) [`c66200b`](https://github.com/mermaid-js/mermaid/commit/c66200bc2302006c908f77819c584109f50c06e7) Thanks [@ashishjain0512](https://github.com/ashishjain0512)! - fix: neo-look arrowheads and crow's-foot markers no longer fall back to default theme colours/stroke widths on the first render with `layout: elk`. State diagram arrowheads stayed dark on dark themes, and ER / requirement markers were drawn at the default stroke width, because markers were created from the layout package's own bundled copy of mermaid, whose config had not been initialized yet.

-   [#8079](https://github.com/mermaid-js/mermaid/pull/8079) [`281cd7b`](https://github.com/mermaid-js/mermaid/commit/281cd7b0705a7cdf4295bfd5e3171647dc809dfb) Thanks [@ashishjain0512](https://github.com/ashishjain0512)! - fix(class): class diagram relation markers (composition, aggregation, extension, dependency, lollipop) no longer scale with the edge stroke width, so they stay outside the class box boundary in themes that set `strokeWidth: 2` (`redux`, `redux-dark`, `redux-color`, `redux-dark-color`, `neo`, `neo-dark`) with the default `classic` look.