# Backstage v1.56.5

> CI/CD & App Delivery · 2026-11-12

A maintenance release with a correctness fix and behavior changes in GitLab and TechDocs. The newly enforced TechDocs extension allowlist may require configuration updates.

## Check if affected
- **[breaking]** The `markdown_extensions` allowlist
  - Applies if you configure `markdown_extensions`.
  - The `markdown_extensions` setting in `mkdocs.yml` is restricted to known extension names before documentation generation in both the MkDocs and Zensical engines. Names outside the permitted set are removed with a warning.

## Other recorded changes
- 3 (added 1, value_changed 1, defect_corrected 1)

[Full analysis](https://ratatosk.io/en/releases/backstage/v1.56.5)

[Original release notes](https://github.com/backstage/backstage/releases/tag/v1.56.5)