Unable to delete Apple WWDRC Certificate

Question

Recently Apple posted an announcement, according to this the intermediate certificate got expired on Feb 14th and has to be downloaded manually and should replace the older expi

Answer 1

The error message says "Operation not permitted". So you don't have the necessary access right. To solve this click on the lock in the upper left corner of the keychain and enter your password.

After you entered your credentials you should be able to delete the old certificate.