Naming Change

• The release previously called TrueNAS 26 is now TrueNAS 27, beginning with RC.1 on October 6, 2026.
• The change reflects the year most users are expected to deploy and operate the release, similar to automobile model years.
• The release schedule is unchanged: TrueNAS 27.0 remains planned for early December 2026.

Simplified Versioning

• TrueNAS is dropping the previous year.month format such as 25.10 and 25.04.
• Because TrueNAS now targets one major release per year, future major releases will simply follow the deployment year:
  • TrueNAS 27
  • TrueNAS 28
  • etc.
• Minor releases will use sequential numbering such as 27.0, 27.1, 27.2, without representing specific months.

Why the Version Number Matters

• Version numbers are often checked during security reviews and audits.
• TrueNAS 27 is based on:
  • Linux kernel 6.18
  • OpenZFS 2.4
• The 27.x series will continue receiving regular security and maintenance updates.

Why Rename It at RC.1?

• RC.1 is when substantially more users and customers begin adopting the release.
• Renaming it now ensures that documentation, upgrades, and support references consistently use TrueNAS 27 before the final release.

What Has Not Changed

• Release date: early December 2026.
• Core code and overall feature set: largely unchanged from the TrueNAS 26 development releases.
• RC.1 does include additional improvements introduced since Beta.3, detailed separately in the RC.1 feature announcement.

https://www.truenas.com/blog/truenas-27-is-here