This morning when I fired up Vivaldi (I still use it for social media), it popped up an update message. Luckily, I actually read the change notes in the message, so I can tell you that Vivaldi 1.4.589.29 consists of an engine (Chromium) update, plus a few bugfixes.
I say ‘luckily’, because as I’m writing this, there’s no announcement of the new version on the Vivaldi blog, and no release notes of any kind. Sheesh.