While using third party password authentication, many time your keychain password doesn't match your updated password.<BR> In order to update password without loosing key are using following command.

# Find your default chain location
security default-keychain
    "/Users/<username>/Library/Keychains/login.keychain-db"
 
# Run following command to change password, followed by old and new prompt.
security set-keychain-password $(security default-keychain)