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Dependabot can now generate security and version updates for Yarn v2 and v3

Dependabot has added support for updating dependencies in Yarn v2 and Yarn v3 manifests (package.json, and yarn.lock files). This is in addition to the existing support for Yarn v1. There is no action required for existing repositories where Dependabot security updates is enabled, however, if you would like to receive proactive updates with Dependabot version updates, you should add configuration for the npm ecosystem to your dependabot.yml file.

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With an organizational level policy to restrict container images, organization administrators can now control which base container images are used while creating organization-owned codespaces. This enables administrators to ensure that only verified container images are being used to create organization-owned codespaces.
allowed image policy screenshot

Organization admins can specify which images and/or image sources are allowed to be used while creating organization-owned codespaces. If the image specified in the dev container configuration does not match one of the allowed images, then subsequent codespace creation will fail asking you to update the image in your configuration. The base image policy does not apply to the default image, or the image that's used to recover a codespace if an error is introduced into a dev container configuration which prevents the container from being rebuilt.

For this release, the image policy will be applied at codespace creation and will not be applied when you rebuild a container. Support for the rebuild scenario is coming soon. We'd love your feedback on this policy and any additional policies that will help your scenarios on Codespaces discussions.

For more information, see Restricting base images for organization-owned codespaces

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Preview Changes in Your Web Editor

Have you ever launched an application in your codespace only for the running application to get lost in a sea of browser tabs? Today we're announcing the ability to preview your running application directly in your web editor.

Update your Preview URL

Supporting this feature required a change to the URL of previewed applications from to This is potentially a breaking change. If you rely on a preview url in any project you will need to update your code to reflect the new URL format.

Alternatively, the environment variable GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN gives you access to the domain that your application will forward to. This will enable you to code in this variable anywhere you have hard-coded the preview URL.

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