React Router, a piece of plumbing used inside a lot of modern websites, put out a new version in June 2026. The people who wrote it went out of their way to make it dull: few breaking changes, a couple of new defaults, and a shift to one modern way of packaging code (ESM, which is just the current standard format JavaScript files ship in). Buried in the same announcement is the bit that actually affects businesses: React Router v6 and Remix v2 have reached end of life.
"End of life" means the people who maintain that software have stopped working on it. No more fixes, and more importantly, no more security patches if someone finds a hole in it. The software does not stop working. Your site will not go dark on a Tuesday. But it quietly stops being maintained, and the gap between what you are running and what is current gets wider every month, which makes the eventual update bigger and more expensive.
Whether this touches you depends on how your site was built. If it is WordPress, Squarespace, Shopify or something similar, this is not your problem at all. React Router only shows up in sites built as custom applications, often ones with a booking system, a customer portal, a calculator, or a dashboard behind a login. If your site was custom built in roughly the last five years and has any of that, there is a reasonable chance React Router is in there somewhere.
The reason a boring release gets written up is that a deliberately dull major version is unusual. The article also notes some developers are weighing up alternatives like TanStack Router, which is worth knowing only so that you are not surprised if your developer mentions it.
What to do: Nothing urgent. Next time you speak to whoever maintains your site, ask two questions: is React Router or Remix used anywhere in this, and if so, which version. If the answer is v6 or Remix v2, ask what updating would involve and roughly what it would cost, so you can budget for it rather than being handed it as an emergency.
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