vercel/next.js · error

Failed to fetch latest canary version. (Reason: ${(e as Erro

Error message

Failed to fetch latest canary version. (Reason: ${(e as Error).message}.)
Detected "${installedRelease}". Visit https://github.com/vercel/next.js/releases.
Make sure to try the latest canary version (eg.: `npm install next@canary`) to confirm the issue still exists before creating a new issue.
Learn more: https://nextjs.org/docs/messages/opening-an-issue

What it means

Error "Failed to fetch latest canary version. (Reason: ${(e as Error).message}.) Detected "${installedRelease}". Visit https://github.com/vercel/next.js/releases. Make sure to try the latest canary version (eg.: `npm install next@canary`) to confirm the issue still exists before creating a new issue. Learn more: https://nextjs.org/docs/messages/opening-an-issue" thrown in vercel/next.js.

Source

Thrown at packages/next/src/cli/next-info.ts:124

  try {
    const registry = getRegistry()
    const res = await fetch(`${registry}-/package/next/dist-tags`)
    const tags = await res.json()

    versionInfo = parseVersionInfo({
      installed: installedRelease,
      latest: tags.latest,
      canary: tags.canary,
    })

    title = getStaleness(versionInfo).title

    if (title) {
      stalenessWithTitle = ` // ${title}`
    }
  } catch (e) {
    console.warn(
      `${yellow(
        bold('warn')
      )}  - Failed to fetch latest canary version. (Reason: ${
        (e as Error).message
      }.)
      Detected "${installedRelease}". Visit https://github.com/vercel/next.js/releases.
      Make sure to try the latest canary version (eg.: \`npm install next@canary\`) to confirm the issue still exists before creating a new issue.
      \nLearn more: ${cyan(
        'https://nextjs.org/docs/messages/opening-an-issue'
      )}`
    )
  }

  const cpuCores = os.cpus().length
  let relevantPackages = `  next: ${installedRelease}${stalenessWithTitle}
  eslint-config-next: ${getPackageVersion('eslint-config-next')}
  react: ${getPackageVersion('react')}
  react-dom: ${getPackageVersion('react-dom')}

View on GitHub (pinned to 4fed8eaf19)

Solutions

1. Check your network connection so the latest canary version can be fetched.
2. Install the latest canary manually (`npm install next@canary`) and verify the issue still exists before reporting.

When it happens

Trigger: Thrown at packages/next/src/cli/next-info.ts:121 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of vercel/next.js@4fed8eaf19 (2026-08-19). Data as JSON: /api/errors/c15dd671afbf0954. Report an issue: GitHub.