diff -up ./src/CaBundle.php.rpm ./src/CaBundle.php
--- ./src/CaBundle.php.rpm	2021-01-12 13:54:38.000000000 +0100
+++ ./src/CaBundle.php	2021-01-12 13:55:35.957422992 +0100
@@ -125,7 +125,7 @@ class CaBundle
      */
     public static function getBundledCaBundlePath()
     {
-        $caBundleFile = __DIR__.'/../res/cacert.pem';
+        $caBundleFile = '/etc/pki/tls/certs/ca-bundle.crt'; // System CA, always
 
         // cURL does not understand 'phar://' paths
         // see https://github.com/composer/ca-bundle/issues/10
diff -up ./tests/CaBundleTest.php.rpm ./tests/CaBundleTest.php
--- ./tests/CaBundleTest.php.rpm	2021-01-12 13:55:35.957422992 +0100
+++ ./tests/CaBundleTest.php	2021-01-12 13:56:54.872069486 +0100
@@ -124,7 +124,7 @@ class CaBundleTest extends TestCase
     public function testOpenBaseDir()
     {
         $oldValue = ini_get('open_basedir') ?: '';
-        ini_set('open_basedir', dirname(__DIR__));
+        ini_set('open_basedir', '/usr/share/php:' . dirname(__DIR__));
         $certFilePath = CaBundle::getSystemCaRootBundlePath();
         $validResult = CaBundle::validateCaFile($certFilePath, null);
         $this->assertTrue($validResult);