diff --git a/lib/interceptor/decompress.js b/lib/interceptor/decompress.js
index c43565a0535..295390ad9ce 100644
--- a/lib/interceptor/decompress.js
+++ b/lib/interceptor/decompress.js
@@ -3,7 +3,6 @@
 const { createInflate, createGunzip, createBrotliDecompress, createZstdDecompress } = require('node:zlib')
 const { pipeline } = require('node:stream')
 const DecoratorHandler = require('../handler/decorator-handler')
-const { runtimeFeatures } = require('../util/runtime-features')
 
 /** @typedef {import('node:stream').Transform} Transform */
 /** @typedef {import('node:stream').Transform} Controller */
@@ -17,7 +16,7 @@ const supportedEncodings = {
   deflate: createInflate,
   compress: createInflate,
   'x-compress': createInflate,
-  ...(runtimeFeatures.has('zstd') ? { zstd: createZstdDecompress } : {})
+  zstd: createZstdDecompress
 }
 
 const defaultSkipStatusCodes = /** @type {const} */ ([204, 304])
diff --git a/lib/util/runtime-features.js b/lib/util/runtime-features.js
index 3e62dc004d3..f6fe3198e1d 100644
--- a/lib/util/runtime-features.js
+++ b/lib/util/runtime-features.js
@@ -6,9 +6,7 @@
 const lazyLoaders = {
   __proto__: null,
   'node:crypto': () => require('node:crypto'),
-  'node:sqlite': () => require('node:sqlite'),
-  'node:worker_threads': () => require('node:worker_threads'),
-  'node:zlib': () => require('node:zlib')
+  'node:sqlite': () => require('node:sqlite')
 }
 
 /**
@@ -27,35 +25,9 @@ function detectRuntimeFeatureByNodeModule (moduleName) {
   }
 }
 
-/**
- * @param {NodeModuleName} moduleName
- * @param {string} property
- * @returns {boolean}
- */
-function detectRuntimeFeatureByExportedProperty (moduleName, property) {
-  const module = lazyLoaders[moduleName]()
-  return typeof module[property] !== 'undefined'
-}
-
-const runtimeFeaturesByExportedProperty = /** @type {const} */ (['markAsUncloneable', 'zstd'])
-
-/** @type {Record<RuntimeFeatureByExportedProperty, [NodeModuleName, string]>} */
-const exportedPropertyLookup = {
-  markAsUncloneable: ['node:worker_threads', 'markAsUncloneable'],
-  zstd: ['node:zlib', 'createZstdDecompress']
-}
-
-/** @typedef {typeof runtimeFeaturesByExportedProperty[number]} RuntimeFeatureByExportedProperty */
-
 const runtimeFeaturesAsNodeModule = /** @type {const} */ (['crypto', 'sqlite'])
 /** @typedef {typeof runtimeFeaturesAsNodeModule[number]} RuntimeFeatureByNodeModule */
-
-const features = /** @type {const} */ ([
-  ...runtimeFeaturesAsNodeModule,
-  ...runtimeFeaturesByExportedProperty
-])
-
-/** @typedef {typeof features[number]} Feature */
+/** @typedef {RuntimeFeatureByNodeModule} Feature */
 
 /**
  * @param {Feature} feature
@@ -64,9 +36,6 @@ const features = /** @type {const} */ ([
 function detectRuntimeFeature (feature) {
   if (runtimeFeaturesAsNodeModule.includes(/** @type {RuntimeFeatureByNodeModule} */ (feature))) {
     return detectRuntimeFeatureByNodeModule(`node:${feature}`)
-  } else if (runtimeFeaturesByExportedProperty.includes(/** @type {RuntimeFeatureByExportedProperty} */ (feature))) {
-    const [moduleName, property] = exportedPropertyLookup[feature]
-    return detectRuntimeFeatureByExportedProperty(moduleName, property)
   }
   throw new TypeError(`unknown feature: ${feature}`)
 }
@@ -101,7 +70,7 @@ class RuntimeFeatures {
    * @param {boolean} value
    */
   set (feature, value) {
-    if (features.includes(feature) === false) {
+    if (runtimeFeaturesAsNodeModule.includes(feature) === false) {
       throw new TypeError(`unknown feature: ${feature}`)
     }
     this.#map.set(feature, value)
diff --git a/lib/web/fetch/index.js b/lib/web/fetch/index.js
index 2f19d0cb154..57df806926f 100644
--- a/lib/web/fetch/index.js
+++ b/lib/web/fetch/index.js
@@ -66,10 +66,6 @@ const { STATUS_CODES } = require('node:http')
 const { bytesMatch } = require('../subresource-integrity/subresource-integrity')
 const { createDeferredPromise } = require('../../util/promise')
 const { isomorphicEncode } = require('../infra')
-const { runtimeFeatures } = require('../../util/runtime-features')
-
-// Node.js v23.8.0+ and v22.15.0+ supports Zstandard
-const hasZstd = runtimeFeatures.has('zstd')
 
 const GET_OR_HEAD = ['GET', 'HEAD']
 
@@ -2251,7 +2247,7 @@ async function httpNetworkFetch (
                     flush: zlib.constants.BROTLI_OPERATION_FLUSH,
                     finishFlush: zlib.constants.BROTLI_OPERATION_FLUSH
                   }))
-                } else if (coding === 'zstd' && hasZstd) {
+                } else if (coding === 'zstd') {
                   decoders.push(zlib.createZstdDecompress({
                     flush: zlib.constants.ZSTD_e_continue,
                     finishFlush: zlib.constants.ZSTD_e_end
diff --git a/lib/web/webidl/index.js b/lib/web/webidl/index.js
index 5518b495906..e5ee5cbb6e7 100644
--- a/lib/web/webidl/index.js
+++ b/lib/web/webidl/index.js
@@ -2,7 +2,7 @@
 
 const assert = require('node:assert')
 const { types, inspect } = require('node:util')
-const { runtimeFeatures } = require('../../util/runtime-features')
+const { markAsUncloneable } = require('node:worker_threads')
 
 const UNDEFINED = 1
 const BOOLEAN = 2
@@ -158,9 +158,7 @@ webidl.util.TypeValueToString = function (o) {
   }
 }
 
-webidl.util.markAsUncloneable = runtimeFeatures.has('markAsUncloneable')
-  ? require('node:worker_threads').markAsUncloneable
-  : () => {}
+webidl.util.markAsUncloneable = markAsUncloneable
 
 // https://webidl.spec.whatwg.org/#abstract-opdef-converttoint
 webidl.util.ConvertToInt = function (V, bitLength, signedness, flags) {
diff --git a/test/fetch/encoding.js b/test/fetch/encoding.js
index 4f6c16ed687..75bba56ef8b 100644
--- a/test/fetch/encoding.js
+++ b/test/fetch/encoding.js
@@ -76,18 +76,16 @@ describe('content-encoding handling', () => {
     t.assert.strictEqual(await response.text(), 'Hello, World!')
   })
 
-  test('should decompress zstandard response',
-    { skip: typeof require('node:zlib').createZstdDecompress !== 'function' },
-    async (t) => {
-      const response = await fetch(`http://localhost:${server.address().port}`, {
-        keepalive: false,
-        headers: { 'accept-encoding': 'zstd' }
-      })
-
-      t.assert.strictEqual(response.headers.get('content-encoding'), 'zstd')
-      t.assert.strictEqual(response.headers.get('content-type'), 'text/plain')
-      t.assert.strictEqual(await response.text(), 'Hello, World!')
+  test('should decompress zstandard response', async (t) => {
+    const response = await fetch(`http://localhost:${server.address().port}`, {
+      keepalive: false,
+      headers: { 'accept-encoding': 'zstd' }
     })
+
+    t.assert.strictEqual(response.headers.get('content-encoding'), 'zstd')
+    t.assert.strictEqual(response.headers.get('content-type'), 'text/plain')
+    t.assert.strictEqual(await response.text(), 'Hello, World!')
+  })
 })
 
 describe('content-encoding chain limit', () => {
diff --git a/test/interceptors/decompress.js b/test/interceptors/decompress.js
index cb42083d1e8..21a55c7bc7e 100644
--- a/test/interceptors/decompress.js
+++ b/test/interceptors/decompress.js
@@ -135,7 +135,7 @@ test('should decompress brotli response', async t => {
   await t.completed
 })
 
-test('should decompress zstd response', { skip: typeof createZstdCompress !== 'function' }, async t => {
+test('should decompress zstd response', async t => {
   t = tspl(t, { plan: 3 })
 
   const server = createServer({ joinDuplicateHeaders: true }, async (req, res) => {
diff --git a/test/node-platform-objects.js b/test/node-platform-objects.js
index 7bc71e8c699..37e619fcde3 100644
--- a/test/node-platform-objects.js
+++ b/test/node-platform-objects.js
@@ -2,35 +2,32 @@
 
 const { tspl } = require('@matteo.collina/tspl')
 const { test } = require('node:test')
-const { markAsUncloneable } = require('node:worker_threads')
 const { Response, Request, FormData, Headers, ErrorEvent, MessageEvent, CloseEvent, EventSource, WebSocket } = require('..')
 const { CacheStorage } = require('../lib/web/cache/cachestorage')
 const { Cache } = require('../lib/web/cache/cache')
 const { kConstruct } = require('../lib/core/symbols')
 
-test('unserializable web instances should be uncloneable if node exposes the api', (t) => {
-  if (markAsUncloneable !== undefined) {
-    t = tspl(t, { plan: 11 })
-    const uncloneables = [
-      { Uncloneable: Response, brand: 'Response' },
-      { Uncloneable: Request, value: 'http://localhost', brand: 'Request' },
-      { Uncloneable: FormData, brand: 'FormData' },
-      { Uncloneable: MessageEvent, value: 'dummy event', brand: 'MessageEvent' },
-      { Uncloneable: CloseEvent, value: 'dummy event', brand: 'CloseEvent' },
-      { Uncloneable: ErrorEvent, value: 'dummy event', brand: 'ErrorEvent' },
-      { Uncloneable: EventSource, value: 'http://localhost', brand: 'EventSource', doneCb: (entity) => entity.close() },
-      { Uncloneable: Headers, brand: 'Headers' },
-      { Uncloneable: WebSocket, value: 'http://localhost', brand: 'WebSocket' },
-      { Uncloneable: Cache, value: kConstruct, brand: 'Cache' },
-      { Uncloneable: CacheStorage, value: kConstruct, brand: 'CacheStorage' }
-    ]
-    uncloneables.forEach((platformEntity) => {
-      const entity = new platformEntity.Uncloneable(platformEntity.value)
-      t.throws(() => structuredClone(entity),
-        DOMException,
-        `Cloning ${platformEntity.brand} should throw DOMException`)
+test('unserializable web instances should be uncloneable', (t) => {
+  t = tspl(t, { plan: 11 })
+  const uncloneables = [
+    { Uncloneable: Response, brand: 'Response' },
+    { Uncloneable: Request, value: 'http://localhost', brand: 'Request' },
+    { Uncloneable: FormData, brand: 'FormData' },
+    { Uncloneable: MessageEvent, value: 'dummy event', brand: 'MessageEvent' },
+    { Uncloneable: CloseEvent, value: 'dummy event', brand: 'CloseEvent' },
+    { Uncloneable: ErrorEvent, value: 'dummy event', brand: 'ErrorEvent' },
+    { Uncloneable: EventSource, value: 'http://localhost', brand: 'EventSource', doneCb: (entity) => entity.close() },
+    { Uncloneable: Headers, brand: 'Headers' },
+    { Uncloneable: WebSocket, value: 'http://localhost', brand: 'WebSocket' },
+    { Uncloneable: Cache, value: kConstruct, brand: 'Cache' },
+    { Uncloneable: CacheStorage, value: kConstruct, brand: 'CacheStorage' }
+  ]
+  uncloneables.forEach((platformEntity) => {
+    const entity = new platformEntity.Uncloneable(platformEntity.value)
+    t.throws(() => structuredClone(entity),
+      DOMException,
+      `Cloning ${platformEntity.brand} should throw DOMException`)
 
-      platformEntity.doneCb?.(entity)
-    })
-  }
+    platformEntity.doneCb?.(entity)
+  })
 })
diff --git a/types/webidl.d.ts b/types/webidl.d.ts
index f95d9b56737..b1873b9e52d 100644
--- a/types/webidl.d.ts
+++ b/types/webidl.d.ts
@@ -87,7 +87,6 @@ interface WebidlUtil {
 
   /**
    * Mark a value as uncloneable for Node.js.
-   * This is only effective in some newer Node.js versions.
    */
   markAsUncloneable (V: any): void