Using the release candidate in preview mode

I’m trying to use the admin api 2025-01 release candidate, yet despite updating the toml and the versioning, when I preview the app it’s still using 2024-10 headers.

Is there a way to fix this or can the preview not use the release candidate?

The TOML doesn’t dictate the API version - that is set in your code. For example, if you’re using the Remix app template, you set the version in shopify.server.ts