Upgrade incrementally: inspect the current `next`, `react`, and `react-dom` versions, move 13 -> 14 -> 15, and keep peer versions compatible. Run the official codemods at each step, especially the async request API transform; await `params`, `searchParams`, `cookies()`, and `headers()`. Audit fetch caching for the v15 behavior, run `next dev` and `next build` after each major, and fix hydration/Turbopack errors before proceeding.
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Upgrade incrementally: inspect the current `next`, `react`, and `react-dom` versions, move 13 -> 14 -> 15, and keep peer versions compatible. Run the official codemods at each step, especially the async request API transform; await `params`, `searchParams`, `cookies()`, and `headers()`. Audit fetch caching for the v15 behavior, run `next dev` and `next build` after each major, and fix hydration/Turbopack errors before proceeding.
