`experimental.instrumentationHook` is no longer needed, because `instrumentation.js` is available by default. You can remove it from next.config.ts.

[coderrshyam]

Is there an existing issue for this?

• I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• I have reviewed the documentation https://docs.sentry.io/
• I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Sentry Saas (sentry.io)

Which SDK are you using?

@sentry/nextjs

SDK Version

10.20.0

Framework Version

React@19.2.0 and Next@16.0.0-beta.0

Link to Sentry event

No response

Reproduction Example/SDK Setup

Just setup simple next.js app configured with sentry. both should be of latest version

Steps to Reproduce

Either run next dev or next build

Expected Result

There should be no warnings

Actual Result

⚠ experimental.instrumentationHook is no longer needed, because instrumentation.js is available by default. You can remove it from next.config.ts.
⚠ Invalid next.config.ts options detected:
⚠ Unrecognized key(s) in object: 'instrumentationHook' at "experimental"
⚠ See more info here: https://nextjs.org/docs/messages/invalid-next-config

   ▲ Next.js 16.0.0-canary.10 (Turbopack)
   - Environments: .env.local
   - Experiments (use with caution):
     ✓ browserDebugInfoInTerminal
     · clientTraceMetadata
     ? instrumentationHook (invalid experimental key)
     · optimizePackageImports
     ✓ turbopackFileSystemCacheForDev

Additional Context

Next config code:

import { withSentryConfig } from "@sentry/nextjs";
import { createMDX } from "fumadocs-mdx/next";
import type { NextConfig } from "next";

const nextConfig: NextConfig = {
  reactCompiler: true,
  reactStrictMode: true,
  typedRoutes: true,
  transpilePackages: [
    "@react-email/components",
    "@react-three/drei",
    "@react-three/fiber",
    "three",
    "sonner",
  ],

  experimental: {
    clientSegmentCache: true,
    browserDebugInfoInTerminal: true,
    turbopackFileSystemCacheForDev: true,
    optimizePackageImports: [
      "@react-email/components",
      "@react-three/drei",
      "@react-three/fiber",
      "three",
      "three-globe",
      "motion",
    ],
  },
 
};

const withMDX = createMDX();

const sentryConfig = {
  org: process.env.SENTRY_ORG,
  project: process.env.SENTRY_PROJECT,
  disableLogger: true,
  silent: !process.env.CI,
  tunnelRoute: "/monitoring",
  automaticVercelMonitors: true,
  widenClientFileUpload: true,
};

export default withSentryConfig(withMDX(nextConfig), sentryConfig);

[linear]

JS-1064

[andreiborza]

Hi @coderrshyam, thanks for filing this. We'll take a look.

[coderrshyam]

@andreiborza you can refer it from

sentry-javascript/packages/nextjs/src/config/withSentryConfig.ts

Line 179 in 24ecd3a

// From Next.js version (15.0.0-canary.124) onwards, Next.js does no longer require the `experimental.instrumentationHook` option and will