The Caves and Cliffs update isn't happening for me.

I have Minecraft Bedrock on My Windows 10 PC and the Caves & Cliffs update isn't coming. Instead, when I open Minecraft, it opens 1.16, more specifically 1.16.221, and for a second, a popup at the top says, "Minecraft Caves & Cliffs Update Available Now!" and it goes away as quickly as it appeared. Could y'all please tell me what to do to fix this? Thanks for reading!