The Wayback Machine - https://web.archive.org./web/20201019093426/https://docs.github.com/en/free-pro-team@latest/github/using-git/updating-credentials-from-the-macos-keychain

Updating credentials from the macOS Keychain

You'll need to update your saved credentials in the git-credential-osxkeychain helper if you change your username, password, or personal access token on GitHub.

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Password-based authentication for Git is deprecated, and we recommend using a personal access token (PAT) when prompted for a password instead, which is more secure. Treat your token just like a password. For more information, see "Creating a personal access token."

Updating your credentials via Keychain Access

  1. Click on the Spotlight icon (magnifying glass) on the right side of the menu bar. Type Keychain access then press the Enter key to launch the app.
    Spotlight Search bar
  2. In Keychain Access, search for github.com.
  3. Find the "internet password" entry for github.com.
    GitHub Password Entry in Keychain
  4. Edit or delete the entry accordingly.

Deleting your credentials via the command line

Through the command line, you can use the credential helper directly to erase the keychain entry.

To do this, type the following command:

$ git credential-osxkeychain erase
host=github.com
protocol=https
> [Press Return]

If it's successful, nothing will print out. To test that it works, try and clone a repository from GitHub. If you are prompted for a password, the keychain entry was deleted.

Further reading

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