Failed to upgrade marketplace

What version of the Codex App are you using (From “About Codex” dialog)?

Version 26.623.31921 • Released Jun 25, 2026

What subscription do you have?

Business Tier

What platform is your computer?

Darwin 25.5.0 arm64 arm

What issue are you seeing?

Since I updated Codex, I'm unable to update my Marketplace -- which points to a private GitHub Repo.
It should update automatically, but it didn't.
So I tried to update it manually, and I get: Failed to upgrade marketplace
(Not very informative. Where can I look to investigate _why_ it failed?)

What steps can reproduce the bug?

I just have an Agent Skills Marketplace that lives on a private GitHub repo.

What is the expected behavior?

I expect the Marketplace and installed Plugins to upgrade automatically. (This was working.)
I also expect more details if there is a problem. For example, could I have messed up a JSON file or something?

Additional information

I asked Codex:

Codex is saying that it "Failed to upgrade marketplace" -- can you tell me why?

And it said:

Codex failed because it could not resolve github.com while trying to run git ls-remote for the git-backed marketplaces: - https://github.com/Olmstead-Consulting/olmst-skills.git - https://github.com/openai/role-specific-plugins.git The exact failure was: Could not resolve host: github.com. I retried the same command outside the restricted sandbox and it succeeded. It upgraded olmst-skills to: 8bfc4ec feat: ... So this was a network/DNS restriction in the failing execution context, not a bad marketplace repo or manifest.

Note that upgrading the role-specific-plugins marketplace indicated that it was successful.