diff --git a/README.md b/README.md
index e24f1ee..40de701 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,10 @@ If `run_install` is a YAML string representation of either an object or an array
 
 **Optional** (_type:_ `string[]`) Additional arguments after `pnpm [recursive] install`, e.g. `[--frozen-lockfile, --strict-peer-dependencies]`.
 
+### `package_json_file`
+
+**Optional** File path to the `package.json` to read "packageManager" configutation. If not specified, `package.json` in the project root directory is used.
+
 ## Outputs
 
 ### `dest`
diff --git a/action.yml b/action.yml
index c99a823..ec60c94 100644
--- a/action.yml
+++ b/action.yml
@@ -6,6 +6,7 @@ branding:
 inputs:
   version:
     description: Version of pnpm to install
+    required: false
   dest:
     description: Where to store pnpm files
     required: false
@@ -14,6 +15,10 @@ inputs:
     description: If specified, run `pnpm install`
     required: false
     default: 'null'
+  package_json_file:
+    description: File path to the package.json to read "packageManager" configutation
+    required: false
+    default: 'package.json'
 runs:
   using: node16
   main: dist/index.js
diff --git a/dist/index.js b/dist/index.js
index 97128e3..47b87f3 100644
Binary files a/dist/index.js and b/dist/index.js differ
diff --git a/src/inputs/index.ts b/src/inputs/index.ts
index db07108..5ebfb4b 100644
--- a/src/inputs/index.ts
+++ b/src/inputs/index.ts
@@ -6,6 +6,7 @@ export interface Inputs {
   readonly version?: string
   readonly dest: string
   readonly runInstall: RunInstall[]
+  readonly packageJsonFile: string
 }
 
 const options: InputOptions = {
@@ -18,6 +19,7 @@ export const getInputs = (): Inputs => ({
   version: getInput('version'),
   dest: parseInputPath('dest'),
   runInstall: parseRunInstall('run_install'),
+  packageJsonFile: parseInputPath('package_json_file'),
 })
 
 export default getInputs
diff --git a/src/install-pnpm/run.ts b/src/install-pnpm/run.ts
index 9feafba..6660f09 100644
--- a/src/install-pnpm/run.ts
+++ b/src/install-pnpm/run.ts
@@ -6,7 +6,7 @@ import { execPath } from 'process'
 import { Inputs } from '../inputs'
 
 export async function runSelfInstaller(inputs: Inputs): Promise<number> {
-  const { version, dest } = inputs
+  const { version, dest, packageJsonFile } = inputs
 
   // prepare self install
   await remove(dest)
@@ -15,7 +15,7 @@ export async function runSelfInstaller(inputs: Inputs): Promise<number> {
   await writeFile(pkgJson, JSON.stringify({ private: true }))
 
   // prepare target pnpm
-  const target = await readTarget(version)
+  const target = await readTarget(packageJsonFile, version)
   const cp = spawn(execPath, [path.join(__dirname, 'pnpm.js'), 'install', target, '--no-lockfile'], {
     cwd: dest,
     stdio: ['pipe', 'inherit', 'inherit'],
@@ -33,7 +33,7 @@ export async function runSelfInstaller(inputs: Inputs): Promise<number> {
   return exitCode
 }
 
-async function readTarget(version?: string | undefined) {
+async function readTarget(packageJsonFile: string, version?: string | undefined) {
   if (version) return `pnpm@${version}`
 
   const { GITHUB_WORKSPACE } = process.env
@@ -44,7 +44,7 @@ please run the actions/checkout before pnpm/action-setup.
 Otherwise, please specify the pnpm version in the action configuration.`)
   }
 
-  const { packageManager } = JSON.parse(await readFile(path.join(GITHUB_WORKSPACE, 'package.json'), 'utf8'))
+  const { packageManager } = JSON.parse(await readFile(path.join(GITHUB_WORKSPACE, packageJsonFile), 'utf8'))
   if (typeof packageManager !== 'string') {
     throw new Error(`No pnpm version is specified.
 Please specify it by one of the following ways: