If you forked the repo, you can pull in new Slab releases at any time:
gitfetchupstreamgitmergeupstream/main
Resolve any conflicts, then run npm install to pick up any dependency changes. Run npm run build afterward to confirm the theme compiles.
Automatic updates
The theme repo ships a Cursor command /pull-upstream-updates you can pass to an AI agent. It walks through a fork-friendly merge policy—for example keeping your saved theme layout JSON while taking upstream tooling, lockfile, locales, and most other files—and pauses for your input on *.liquid conflicts instead of guessing. See Work with coding agents for the full command list.