Some time ago I bought some satoshis and installed Electrum v3.x on a fresh install of Windows 10 on a spare laptop, to use as a cold storage setup. This is always off line and only ever used to sign transactions.

I upgraded to a watching version of Electrum to 4.x on an online pc.

The question is, do I ever need to upgrade Electrum on the cold storage laptop, assuming the laptop continues to work?