Koha 26.05.00 released

Koha 26.05.00 is now released. This is a major release with new features, hundreds of enhancements across the catalog, acquisitions, OPAC, staff interface, REST API, EDI/EDIFACT tooling, and many bug and security fixes.

Quick summary:

• Release date: 26 May 2026
• New features: 2
• Enhancements: 214
• Bug fixes: 365

Notable highlights

• Restore deleted records: a new staff page and REST API to view and restore bibliographic and item records removed into Koha’s deleted tables.
• OPAC accessibility and usability improvements, including better placeholders, ARIA updates, and refinements to search and facets.
• A modern, interactive EDIFACT message viewer with tree/raw views, search, JSON download, and focus mode for baskets and invoices.
• Multiple security and critical bug fixes (see CVE and security sections in the release notes).

Recommendations for Koha administrators

1. Read the full release notes and security advisories: see the official release page linked above.
2. Test the upgrade in a staging environment before applying to production. Follow your normal backup and rollback procedures.
3. Pay attention to changes that may require configuration updates (for example, Elasticsearch/Zebra mappings, new system preferences, or REST API behaviour).
4. If you use KohaSupport AMIs: follow the KohaSupport AMI upgrade procedure described at How to upgrade Koha to a new AMI version. The KohaSupport v26.05.00 AMI is under development; it will be published in the coming weeks. Contact us if you need help planning or applying the upgrade. Bookmark our news and announcements page for the latest updates: News & Announcements.

Downloads and documentation

• Upgrading KohaSupport Koha Cloud Servers: How to upgrade Koha to a new AMI version
• Official release and downloads: Koha 26.05.00 released
• Installation and system requirements: Installation Documentation

Questions about upgrading your stack? Contact support or see the AMI upgrade guide.