diff --git a/src/index.ts b/src/index.ts
index eef0ecc..2033b2b 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -11,7 +11,7 @@ import { inspect, types } from 'node:util'
 import assert from 'node:assert'
 import { performance } from 'node:perf_hooks'
 import { readFileSync } from 'node:fs'
-import { amount as physicalCpuCount } from './physicalCpuCount'
+import { availableParallelism } from 'node:os'
 import {
   type ReadyMessage,
   type RequestMessage,
@@ -50,7 +50,7 @@ declare global {
   }
 }
 
-const cpuCount: number = physicalCpuCount
+const cpuCount: number = availableParallelism()
 
 interface AbortSignalEventTargetAddOptions {
   once: boolean
diff --git a/src/physicalCpuCount.ts b/src/physicalCpuCount.ts
deleted file mode 100644
index 5fe3bc4..0000000
--- a/src/physicalCpuCount.ts
+++ /dev/null
@@ -1,52 +0,0 @@
-// https://www.npmjs.com/package/physical-cpu-count in ESM
-import os from 'node:os'
-import childProcess from 'node:child_process'
-
-function exec(command: string) {
-  const output = childProcess.execSync(command, {
-    encoding: 'utf8',
-    stdio: [null, null, null],
-  })
-  return output
-}
-
-let amount: number
-
-try {
-  const platform = os.platform()
-
-  if (platform === 'linux') {
-    const output1 = exec(
-      'cat /proc/cpuinfo | grep "physical id" | sort |uniq | wc -l'
-    ) // physical cpu number
-    const output2 = exec(
-      'cat /proc/cpuinfo | grep "core id" | sort | uniq | wc -l'
-    ) // physical cpu core number in each cpu
-
-    const physicalCpuAmount = parseInt(output1.trim(), 10)
-    const physicalCoreAmount = parseInt(output2.trim(), 10)
-
-    amount = physicalCpuAmount * physicalCoreAmount
-  } else if (platform === 'darwin') {
-    const output = exec('sysctl -n hw.physicalcpu_max')
-    amount = parseInt(output.trim(), 10)
-  } else if (platform === 'win32') {
-    // windows takes too long, so let's drop the support
-    throw new Error()
-  } else {
-    const cores = os.cpus().filter(function (cpu, index) {
-      const hasHyperthreading = cpu.model.includes('Intel')
-      const isOdd = index % 2 === 1
-      return !hasHyperthreading || isOdd
-    })
-    amount = cores.length
-  }
-} catch {
-  amount = os.cpus().length
-}
-
-if (amount === 0) {
-  amount = os.cpus().length
-}
-
-export { amount }
diff --git a/test/cpu-count.test.ts b/test/cpu-count.test.ts
deleted file mode 100644
index 62f53e6..0000000
--- a/test/cpu-count.test.ts
+++ /dev/null
@@ -1,100 +0,0 @@
-import { expect, type Mock, test, vi } from 'vitest'
-import os from 'node:os'
-import childProcess from 'node:child_process'
-
-const platform = os.platform as Mock
-const cpus = os.cpus as Mock
-const execSync = childProcess.execSync as Mock
-
-beforeEach(() => {
-  vi.resetModules()
-})
-
-describe('Linux', () => {
-  beforeEach(() => {
-    platform.mockImplementationOnce(() => 'linux')
-  })
-
-  test('returns cpus from cpuinfo', async () => {
-    execSync
-      .mockImplementationOnce(() => '20')
-      .mockImplementationOnce(() => '40')
-
-    const { amount } = await import('../src/physicalCpuCount')
-
-    expect(amount).toBe(800)
-  })
-
-  test('returns cpus from node:os when cpuinfo returns 0', async () => {
-    execSync.mockImplementationOnce(() => '0').mockImplementationOnce(() => '0')
-    cpus.mockImplementation(() => Array(105))
-
-    const { amount } = await import('../src/physicalCpuCount')
-
-    expect(amount).toBe(105)
-  })
-})
-
-describe('MacOS', () => {
-  test('returns cpus from node:os', async () => {
-    platform.mockImplementationOnce(() => 'darwin')
-    execSync.mockImplementationOnce(() => '123.32')
-
-    const { amount } = await import('../src/physicalCpuCount')
-
-    expect(amount).toBe(123)
-  })
-})
-
-describe('Windows', () => {
-  test('returns cpus from node:os', async () => {
-    platform.mockImplementationOnce(() => 'win32')
-    cpus.mockImplementation(() => Array(101))
-
-    const { amount } = await import('../src/physicalCpuCount')
-
-    expect(amount).toBe(101)
-  })
-})
-
-describe('Unknown OS', () => {
-  test('returns cpus resolved from node:os', async () => {
-    platform.mockImplementationOnce(() => 'custom')
-    cpus.mockImplementation(() => [
-      { model: 'Intel 1' },
-      { model: 'AMD 1' },
-      { model: 'Intel 2' },
-      { model: 'Intel 3' },
-      { model: 'AMD 2' },
-    ])
-
-    const { amount } = await import('../src/physicalCpuCount')
-
-    expect(amount).toBe(3)
-  })
-})
-
-vi.mock(import('node:os'), async (importOriginal) => {
-  const original = await importOriginal()
-
-  return {
-    ...original,
-    default: {
-      ...original.default,
-      platform: vi.fn().mockImplementation(original.platform),
-      cpus: vi.fn().mockImplementation(original.cpus),
-    },
-  }
-})
-
-vi.mock(import('node:child_process'), async (importOriginal) => {
-  const original = await importOriginal()
-
-  return {
-    ...original,
-    default: {
-      ...original.default,
-      execSync: vi.fn().mockImplementation(original.execSync),
-    },
-  }
-})
diff --git a/test/options.test.ts b/test/options.test.ts
index 7326a11..e4991d2 100644
--- a/test/options.test.ts
+++ b/test/options.test.ts
@@ -51,7 +51,7 @@ vi.mock(import('node:os'), async (importOriginal) => {
   const original = await importOriginal()
   return {
     ...original,
-    default: { ...original.default, cpus: () => Array(cpuCount) },
+    availableParallelism: () => cpuCount,
   }
 })