Changes to "Let's Encrypt" - September 2021


Feb 25, 2021
I am uncertain if this is the correct forum to share this news with or not. Please forgive me if I am in the wrong forum.

I know not everyone subscribes to general e-mail. Lord knows, most developments have the poor habit of "spamming" their poor interested parties to death. So on occasion, I fear little important details can sometimes slip through the cracks. That all said, I thought it was worth bringing up that, Let's Encrypt, which provides free SSL certificates, is making a notable change this coming September 2021.

On September 30, there will be a change in how older browsers and devices trust Let's Encrypt certificates, resulting in a minor decrease in incompatibility. If you run a typical website, you won't notice a difference. Devices and browsers running up-to-date software will continue working fine, and we've taken steps to make sure the vast majority of older devices will too. If you run a large website or need to support less common software (particularly non-browser software), you'll want to read about the details at:

In either case, no action is required from you. We're letting you know so you can provide answers to any questions your site visitors may have.


Flavours of Forums Forever
Sep 9, 2013
I wouldn’t expect this to affect most of us here to be honest, most of us here are using either current gen or last gen devices/browsers which can support the newer certificate normally.

iPhone 4 users for example (2012 or so?) might be out of luck though.