Charmcraft 4.4 release notes

28 July 2026

Learn about the new features, changes, and fixes introduced in Charmcraft 4.4.

Requirements and compatibility

For development and testing, Charmcraft requires a host with a minimum of 4GB RAM running a Linux distribution compatible with systemd.

All versions of Charmcraft require the following software:

We recommend you install the Charmcraft snap. It comes bundled with all its dependencies.

Non-snap installations of Charmcraft have the following dependencies:

What’s new

Charmcraft 4.4 brings the following new features.

Ubuntu One authentication

Charmcraft now uses Ubuntu One authentication instead of Candid for store access and publishing workflows. Login is now handled entirely in the CLI, without a browser-based authentication step.

12-factor extension and profile updates

Charmcraft 4.4 introduces the following improvements to the 12-factor app templates and extensions:

  • Extension dispatch support for 12-factor extensions.

  • Base support for the Flask and Django extensions.

  • Generated tests now treat warnings as errors by default.

  • Validation for paas-config.yaml inputs.

Documentation improvements

Charmcraft 4.4 includes the following documentation changes:

  • The guidance on setting up and testing machine and Kubernetes charms was improved in Manage charms and Profile.

  • Charm naming guidelines have been made clearer in Manage names.

  • Manage charms now clarifies how charms interact with Juju secrets.

Fixed bugs and issues

The following issues have been resolved in Charmcraft 4.4.0:

  • The Poetry plugin was installing the python3-poetry-plugin-export package even when a poetry-deps part was included.

Known issues

The following issues were reported and are scheduled to be fixed in upcoming patch releases.

See individual issue links for any mitigations.

  • #2078 charmcraft clean does not clean all platforms for a charm

  • #1990 Cannot stage packages with Charmcraft

  • #2492 Internal error when uploading a charm outside of a project directory

  • #2788 uv plugin fails on core26: dispatch script uses system Python instead of venv

Contributors

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

@PraaneshSelvaraj, @alithethird, @bepri, @canon-cat, @cmatsuoka, @dwilding, @erinecon, @florentianayuwono, @jahn-junior, @javierdelapuente, @lengau, @medubelko, @mr-cal, @smethnani, @tigarmo, @tonyandrewmeyer, @tromai, and @upils