to_self_delay cannot be updated after opening a channel

[AndySchroder]

As far as I can tell, the to_self_delay cannot be updated after opening a channel. Can it? With dynamic fee markets I think the two parties in a channel should be able to agree to update the to_self_delay with a new commitment transaction at any time. Is there any technical reason why this cannot be possible, or is there just no communication protocol for doing it yet?

[saubyk]

Can be addressed with dynamic commitments?
#1117

[t-bast]

is there just no communication protocol for doing it yet?

That's exactly why, and also because it's not a very high priority feature (to_self_delay is only used when force-closing, which shouldn't happen anyway). This can be done during a splice, or with any other "dynamic commitments upgrade" protocol.

[AndySchroder]

Looks like https://github.com/lightning/bolts/blob/3aacdb186b15942218dd860252e953db3e1cd258/ext-dynamic-commitments.md#channel-opening-parameters does mention to_self_delay.