diff --git a/__tests__/tools.test.ts b/__tests__/tools.test.ts
index 1a6b1acf..4bc7db4f 100644
--- a/__tests__/tools.test.ts
+++ b/__tests__/tools.test.ts
@@ -267,6 +267,15 @@ describe('Tools tests', () => {
     expect(await tools.getComposerUrl('2')).toContain(
       'https://getcomposer.org/composer-2.phar'
     );
+    expect(await tools.getComposerUrl('1.7.2')).toContain(
+      'https://github.com/composer/composer/releases/download/1.7.2/composer.phar'
+    );
+    expect(await tools.getComposerUrl('2.0.0-RC2')).toContain(
+      'https://github.com/composer/composer/releases/download/2.0.0-RC2/composer.phar'
+    );
+    expect(await tools.getComposerUrl('wrong')).toContain(
+      'https://getcomposer.org/composer-stable.phar'
+    );
   });
 
   it('checking getSymfonyUri', async () => {
diff --git a/dist/index.js b/dist/index.js
index 83836f34..a44fb254 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -2058,6 +2058,10 @@ async function getComposerUrl(version) {
         case '2':
             return (cache_url + 'https://getcomposer.org/composer-' + version + '.phar');
         default:
+            if (/^\d+\.\d+\.\d+[\w-]*$/.test(version)) {
+                return (cache_url +
+                    `https://github.com/composer/composer/releases/download/${version}/composer.phar`);
+            }
             return cache_url + 'https://getcomposer.org/composer-stable.phar';
     }
 }
diff --git a/src/tools.ts b/src/tools.ts
index 8a05a44a..050802d4 100644
--- a/src/tools.ts
+++ b/src/tools.ts
@@ -344,6 +344,12 @@ export async function getComposerUrl(version: string): Promise<string> {
         cache_url + 'https://getcomposer.org/composer-' + version + '.phar'
       );
     default:
+      if (/^\d+\.\d+\.\d+[\w-]*$/.test(version)) {
+        return (
+          cache_url +
+          `https://github.com/composer/composer/releases/download/${version}/composer.phar`
+        );
+      }
       return cache_url + 'https://getcomposer.org/composer-stable.phar';
   }
 }