diff --git a/__tests__/utils.test.ts b/__tests__/utils.test.ts
index 50732785..2fd4be33 100644
--- a/__tests__/utils.test.ts
+++ b/__tests__/utils.test.ts
@@ -52,7 +52,8 @@ describe('Utils tests', () => {
     expect(await utils.parseVersion('4.x')).toBe(undefined);
   });
 
-  it('checking resolveVersionInput', async () => {
+  it('checking resolveVersionInput', () => {
+    // composer.json
     expect(utils.parsePhpVersionFile('{"require": {"php": "^8.1"}}')).toBe(
       '8.1'
     );
@@ -68,6 +69,10 @@ describe('Utils tests', () => {
     expect(utils.parsePhpVersionFile('{"require": {"php": "^8.1|^8.0"}}')).toBe(
       '8.1'
     );
+    // asdf: .tool-versions
+    expect(utils.parsePhpVersionFile('php 8.1')).toBe('8.1');
+    // phpenv: .php-version
+    expect(utils.parsePhpVersionFile('8.1.1')).toBe('8.1');
   });
 
   it('checking parseIniFile', async () => {
diff --git a/dist/index.js b/dist/index.js
index d0aa2242..db9eaa04 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -1070,10 +1070,8 @@ async function resolveVersionInput() {
 }
 exports.resolveVersionInput = resolveVersionInput;
 function parsePhpVersionFile(contents) {
-    const json = JSON.parse(contents);
-    const version = json.config?.platform?.php ?? json.require?.php;
-    const match = version.match(/(\d+(\.\d+))/);
-    return match ? match[1] : '';
+    const match = contents.match(/("php:")?.*?(\d+(\.\d+))/);
+    return match ? match[2] : '';
 }
 exports.parsePhpVersionFile = parsePhpVersionFile;
 async function getManifestURL() {
diff --git a/src/utils.ts b/src/utils.ts
index 206e5674..bf885ff6 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -76,10 +76,8 @@ export async function resolveVersionInput(): Promise<string> {
 }
 
 export function parsePhpVersionFile(contents: string): string {
-  const json = JSON.parse(contents);
-  const version = json.config?.platform?.php ?? json.require?.php;
-  const match = version.match(/(\d+(\.\d+))/);
-  return match ? match[1] : '';
+  const match = contents.match(/("php:")?.*?(\d+(\.\d+))/);
+  return match ? match[2] : '';
 }
 
 /** Function to get manifest URL