Rockcraft 1.20 release notes

20 July 2026

Learn about the new features, changes, and fixes introduced in Rockcraft 1.20. For information about the Rockcraft release cycle, see the Release policy and schedule.

Requirements and compatibility

To run Rockcraft, a system requires the following minimum hardware and installed software. These requirements apply to local hosts as well as VMs and container hosts.

Minimum hardware requirements

  • AMD64, ARM64, ARMv7-M, RISC-V 64-bit, PowerPC 64-bit little-endian, or S390x processor

  • 2GB RAM

  • 10GB available storage space

  • Internet access for remote software sources and the Snap Store

Platform requirements

Platform

Version

Software requirements

GNU/Linux

Popular distributions that ship with systemd and are compatible with snapd

systemd

What’s new

Rockcraft 1.20 brings the following features, integrations, and improvements.

ubuntu@26.10 base

Rockcraft now supports ubuntu@26.10 as a base. Since this version of Ubuntu is in development at the time of release, to select this base you must also set build-base: devel.

FIPS Pebble

When packing a rock with a FIPS Ubuntu Pro service, Rockcraft now includes a FIPS version of Pebble.

Documentation homepage

The Rockcraft homepage has been revamped to better reflect the content of the documentation.

Minor features

Rockcraft 1.20 brings the following minor changes.

Flask and Django application directory

The ubuntu@26.04 versions of flask-framework and django-framework extensions now place application source files in /app. This aligns rocks built with these extensions with the directory layout expected by version 2 of the library paas-charm.

Framework extension stability and application data

The Flask, Django, FastAPI, Go, and Express framework extensions remain stable on their supported bases earlier than Ubuntu 26.04 LTS. Spring Boot remains experimental on its supported bases. The Ubuntu 26.04 LTS implementations of all six extensions are experimental and require ROCKCRAFT_ENABLE_EXPERIMENTAL_EXTENSIONS=1.

Rockcraft selects the extension implementation from build-base when set, and otherwise from base. A rock with base: bare requires build-base. The Ubuntu 26.04 LTS implementations place application content in /app and provide the writable /app-data directory for application-generated data. See Ubuntu 26.04 LTS framework extensions for the full contract and Change from ubuntu@24.04 to ubuntu@26.04 for migration guidance.

Support for ARMv8 in 32-bit mode (armv8l)

Rockcraft no longer fails when the system is an ARMv8 running in 32-bit mode.

Documentation improvements

We’ve made improvements to the documentation:

  • Clarified the minimum version of LXD to pack Pro rocks.

  • Updated the tutorials to target base ubuntu@26.04.

  • Clarified the naming rules for platform keys.

  • Incorporated user feedback on the 12-factor reference pages.

Contributors

We would like to express a big thank you to all the people who contributed to this release.

@asanvaq, @bepri, @canon-cat, @cmatsuoka, @danielvnguyen, @erinecon, @Gargoth, @gcomneno, @jahn-junior, @lengau, @medubelko, @mr-cal, @NiShITa-code, @Pawansingh3889, @PraaneshSelvaraj, @smethnani, @steinbro, @TechWriterP, @tigarmo, @zhijie-yang, and @zlplzp123wyt.