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@dependabot dependabot bot commented on behalf of github Oct 17, 2025

Bumps sigstore/cosign-installer from 3.10.0 to 4.0.0.

Release notes

Sourced from sigstore/cosign-installer's releases.

v4.0.0

What's Changed?

Note: You must upgrade to cosign-installer v4 if you want to install Cosign v3+. You may still install Cosign v2.x with cosign-installer v4.

  • Add support for Cosign v3 releases (#201)

v3.10.1

What's Changed?

Note: cosign-installer v3.x cannot be used to install Cosign v3.x. You must upgrade to cosign-installer v4 in order to use Cosign v3.

Note: This is planned to be the final release of Cosign v2, though we will cut new releases for any critical security or bug fixes. We recommend transitioning to Cosign v3.

  • Bump default Cosign to v2.6.1 (#203)
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@dependabot dependabot bot added dependencies Pull requests that update a dependency file github_actions Pull requests that update GitHub Actions code labels Oct 17, 2025
@BenjaminPelletier
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@mickmis could you take a look to make sure this major-version upgrade won't cause any problems? I hesitate to make a major version upgrade automatically, especially since I don't think we have strong automated test coverage of the potential consequences of the upgrade.

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mickmis commented Nov 25, 2025

@mickmis could you take a look to make sure this major-version upgrade won't cause any problems? I hesitate to make a major version upgrade automatically, especially since I don't think we have strong automated test coverage of the potential consequences of the upgrade.

I've not come around to test this. This upgrade indeed deserves to be tested manually: this upgrades the version of Cosign from v2 to v3.

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.10.0 to 4.0.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@d7543c9...faadad0)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
@mickmis mickmis force-pushed the dependabot/github_actions/sigstore/cosign-installer-4.0.0 branch 3 times, most recently from 2d5830e to 4c780ac Compare November 25, 2025 11:35
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mickmis commented Nov 25, 2025

It looks like the upgrade of cosign from v2 to v3 is not exactly smooth. It notably seems to be using a new format to store signatures. And there is some retrocompatbility using a specific flag. But apparently not all subcommands support that yet somehow?
Also, I failed to actually produce a verifyiable signature in this PR. With more effort I probably can find the issue, but given the above, I'd suggest sticking for now with cosign v2. We should still be able to upgrade the github action though.

@mickmis mickmis force-pushed the dependabot/github_actions/sigstore/cosign-installer-4.0.0 branch from 4c780ac to 730d917 Compare November 25, 2025 11:55
@mickmis mickmis force-pushed the dependabot/github_actions/sigstore/cosign-installer-4.0.0 branch from 730d917 to bfedba6 Compare November 25, 2025 11:58
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bfedba6 pins the cosign version to v2.6.1 (using github action cosign-installer v4.0.0) and confirms the image is signed correctly and can be verified. I will revert the changes made for testing and merge this PR.

@mickmis mickmis merged commit beb8c9a into main Nov 25, 2025
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@mickmis mickmis deleted the dependabot/github_actions/sigstore/cosign-installer-4.0.0 branch November 25, 2025 13:03
github-actions bot added a commit that referenced this pull request Nov 25, 2025
Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mickaël Misbach <mickael@misba.ch> beb8c9a
github-actions bot added a commit to airspace-link-inc/monitoring that referenced this pull request Nov 25, 2025
Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mickaël Misbach <mickael@misba.ch> beb8c9a
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3 participants