# eigen 3.4.1

- Product: eigen (https://whatsnew.fyi/product/eigen)
- Vendor: libeigen
- Date: 2025-09-29
- Version: 3.4.1
- Original notes: https://gitlab.com/libeigen/eigen/-/releases/3.4.1
- Permalink: https://whatsnew.fyi/product/eigen/releases/3.4.1

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** — Many bug fixes have been backported from the main branch

Many bug fixes have been backported from the main branch.

A list of new issues addressed can be found via the [3.4.1](https://gitlab.com/libeigen/eigen/-/issues?state=all&label_name%5B%5D=3.4.1) label on GitLab.

Check the [git commit history](https://gitlab.com/libeigen/eigen/-/commits/3.4.1) for the full list of changes.