old deprecated gpg key and PPA

So I didn't realize that I had signed the CoC with the old key that I deprecated long back. I created a PPA today, and it got created with the old key. Now, when I add the PPA, I get the following error.

What I need to know is how I can update the key for my PPA with the new one? I ask this because I do not want to lose the PPA name.

rrs@zan:~/devel/Laptop-Mode-Tools/laptop-mode-tools (ubuntu)$ sudo add-apt-repository ppa:rrs/laptop-mode-tools
You are about to add the following PPA to your system:
 PPA for Laptop Mode Tools

This PPA is created for the latest and greatest version of Laptop Mode Tools. Please note that this PPA also ships a modified version of pm-utils, where all overlapping features have been removed from the pm-utils package.
So if you run into power related problems, do not just file a bug report on Launchpad. Investigate first.

Use at your own risk.
 More info: https://launchpad.net/~rrs/+archive/laptop-mode-tools
Press [ENTER] to continue or ctrl-c to cancel adding it

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.2/threading.py", line 740, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 141, in run
    self.add_ppa_signing_key(self.ppa_path)
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 223, in add_ppa_signing_key
    tmp_keyring, tmp_secret_keyring, signing_key_fingerprint, tmp_keyring_dir):
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 145, in _recv_key
    if not verify_keyid_is_v4(signing_key_fingerprint):
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 126, in verify_keyid_is_v4
    return len(signing_key_fingerprint) >= 160/8
TypeError: object of type 'NoneType' has no len()