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+# Upgrading Homebrew and avoiding the failed to verify attestation error
+
+I managed to get my Homebrew installation back into shape today. The first problem I was having is that it complained that macOS Sequoia was unsupported:
+
+```
+Warning: You are using macOS 15.
+We do not provide support for this pre-release version.
+```
+
+It turns out I was on an older Homebrew version. Sequoia support was added [in Homebrew 4.4.0](https://brew.sh/2024/10/01/homebrew-4.4.0/) released on October 1st 2024.
+
+For some reason `brew upgrade` wasn't fetching that new version. I ended up using this recipe [from StackOverflow](https://apple.stackexchange.com/a/277391):
+
+```bash
+cd "$(brew --repo)" && git fetch && git reset --hard origin/master && brew update
+```
+
+## Failed to verify attestation
+
+Homebrew added [a feature recently](https://github.com/Homebrew/brew/issues/17019) that checks cryptographical "attestations" on downloaded packages. This is implemented via the GitHub `gh` command.
+
+My first problem was that I got this error:
+
+    unknown command "attestation" for "gh"
+
+The solution ([thanks again, StackOverflow](https://stackoverflow.com/questions/78919643/unknown-command-attestation-for-gh)) was to manually upgrade the `gh` package first to get the new command:
+```bash
+brew upgrade gh
+```
+
+Then I ran `brew upgrade` to upgrade everything... which didn't quite work, because I kept running into warnings like this one:
+
+```
+==> Verifying attestation for ca-certificates
+Warning: Failed to verify attestation. Retrying in 1...
+Warning: Failed to verify attestation. Retrying in 3...
+Warning: Failed to verify attestation. Retrying in 9...
+Warning: Failed to verify attestation. Retrying in 27...
+```
+I frequently have rate limiting problems with my GitHub account, so my hunch is that these were causing the command to fail.
+
+The fix was to run this instead, using the `HOMEBREW_NO_VERIFY_ATTESTATIONS` environment variable to disable attestation checking entirely:
+
+```bash
+HOMEBREW_NO_VERIFY_ATTESTATIONS=1 brew upgrade
+```