Didn't have any luck with other solutions and was blocked from working on a project that required a new version from an ssh private repo. Added the following to ~/.ssh/config to temporarily bypass host checking. Not great, but at least I can fetch things until it's fixed. Host github.com AddKeysToAgent yes UseKeychain yes IdentityFile ~/.ssh/id_ed25519 // Added these two lines: StrictHostKeyChecking no UserKnownHostsFile /dev/null