New release of our favourite dark mode wallet from Darko and team. From the release notes:
Daedalus 4.3.1 for the Cardano mainnet brings Alonzo support. It also includes a countdown for the Alonzo upgrade activation, improved presentation of windows, enhancements to transaction management, and support for the upcoming Trezor hardware wallet firmware update.
https://iohk.zendesk.com/hc/en-us/articles/4406192725913
You need to upgrade to this for the Alonzo era from September 12th. Usual drill, launch Daedalus and you will be prompted to upgrade.