From Emurgo Announcements on Telegram
You can delegate your ADA with:
- 15-word
- 24-word
- Trezor
The extension should automatically update to 3.1.1, but sometimes it may take a day or two for Chrome to auto-update. You may manually force Chrome to check for updates if you don’t want to wait. (Ledger & ITN claiming coming in a later update).