Hi. I just:

1. Ran npx @next/codemod@canary upgrade latest on an existing project;
2. Enabled ppr: "incremental", in next.config.js;
3. Added export const experimental_ppr = true; to a page.tsx

And immediately when running a dev build, the build is exiting with an error:

__NEXT_ERROR_CODE =
'E394'
message =
'The experimental feature "experimental.ppr" can only be enabled when using the latest canary version of Next.js.'

In package.json the versions are:

    "next": "15.2.2",
    "react": "19.0.0",
    "react-dom": "19.0.0",
    //...
    "@types/react": "19.0.10",
    "@types/react-dom": "19.0.4",

I tried:

1. Running install next@latest react@latest react-dom@latest
2. Removing react and react-dom and the weird @types/* versions for the two, and reinstalling react. I know it has nothing to do with the issue, but just in case.

Nothing helped.

Sorry, If I just didn't find the right place to look. The latest version on the blog is 15.2, and these were the suggested update commands.