diff --git a/src/Symfony/Bridge/PhpUnit/bin/simple-phpunit.php b/src/Symfony/Bridge/PhpUnit/bin/simple-phpunit.php
index 96ecf500f6..e59b6670f0 100644
--- a/src/Symfony/Bridge/PhpUnit/bin/simple-phpunit.php
+++ b/src/Symfony/Bridge/PhpUnit/bin/simple-phpunit.php
@@ -167,7 +167,8 @@ if ($prevCacheDir) {
     }
 }
 $SYMFONY_PHPUNIT_REMOVE = $getEnvVar('SYMFONY_PHPUNIT_REMOVE', 'phpspec/prophecy'.($PHPUNIT_VERSION < 6.0 ? ' symfony/yaml' : ''));
-$configurationHash = md5(implode(\PHP_EOL, [md5_file(__FILE__), $SYMFONY_PHPUNIT_REMOVE, (int) $PHPUNIT_REMOVE_RETURN_TYPEHINT]));
+$SYMFONY_PHPUNIT_REQUIRE = $getEnvVar('SYMFONY_PHPUNIT_REQUIRE', '');
+$configurationHash = md5(implode(\PHP_EOL, [md5_file(__FILE__), $SYMFONY_PHPUNIT_REMOVE, $SYMFONY_PHPUNIT_REQUIRE, (int) $PHPUNIT_REMOVE_RETURN_TYPEHINT]));
 $PHPUNIT_VERSION_DIR = sprintf('phpunit-%s-%d', $PHPUNIT_VERSION, $PHPUNIT_REMOVE_RETURN_TYPEHINT);
 if (!file_exists("$PHPUNIT_DIR/$PHPUNIT_VERSION_DIR/phpunit") || $configurationHash !== @file_get_contents("$PHPUNIT_DIR/.$PHPUNIT_VERSION_DIR.md5")) {
     // Build a standalone phpunit without symfony/yaml nor prophecy by default
@@ -224,6 +225,9 @@ if (!file_exists("$PHPUNIT_DIR/$PHPUNIT_VERSION_DIR/phpunit") || $configurationH
     if ($SYMFONY_PHPUNIT_REMOVE) {
         $passthruOrFail("$COMPOSER remove --no-update ".$SYMFONY_PHPUNIT_REMOVE);
     }
+    if ($SYMFONY_PHPUNIT_REQUIRE) {
+        $passthruOrFail("$COMPOSER require --no-update ".$SYMFONY_PHPUNIT_REQUIRE);
+    }
     if (5.1 <= $PHPUNIT_VERSION && $PHPUNIT_VERSION < 5.4) {
         $passthruOrFail("$COMPOSER require --no-update phpunit/phpunit-mock-objects \"~3.1.0\"");
     }