Git repos and subkey expiration

I sign all of my commits for all the git repositories I use. I also enforce pretty strict security and only keep subkeys on my computer (and my master safely stored elsewhere) and I have my subkeys expire every 6 months out of a paranoid sense of security. Will it be problematic when those subkeys expire for the verification of my commits? And will I be able to sign future commits with a different signing subkey without issue?