diff --git a/.github/workflows/compat_tests.yaml.yml b/.github/workflows/compat_tests.yaml.yml
index 6a74a46..f629470 100644
--- a/.github/workflows/compat_tests.yaml.yml
+++ b/.github/workflows/compat_tests.yaml.yml
@@ -12,6 +12,10 @@ jobs:
             fail-fast: false
             matrix:
                 actions:
+                    -
+                        name: 'Rector dev + PHPUnit 10'
+                        run: composer require "phpunit/phpunit:10.*" -W
+                        php: 8.2
                     -
                         name: 'Rector dev + PHPUnit 11'
                         run: composer require "phpunit/phpunit:11.*" -W
diff --git a/composer.json b/composer.json
index 234082d..1aa3e32 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
     "description": "Tests for compatibility with PHPStand and PHPUnit preload magic",
     "require-dev": {
         "php": "^8.2",
-        "phpunit/phpunit": "11.*|12.*",
+        "phpunit/phpunit": "10.*|11.*|12.*",
         "rector/rector": "dev-main",
         "phpstan/phpstan": "^2.1"
     },
diff --git a/tests/ConflictingPhpParserLibraryTest.php b/tests/ConflictingPhpParserLibraryTest.php
new file mode 100644
index 0000000..d2eca54
--- /dev/null
+++ b/tests/ConflictingPhpParserLibraryTest.php
@@ -0,0 +1,20 @@
+<?php declare(strict_types=1);
+
+namespace BBurnichon\RectorIssue9437\Tests;
+
+use PHPUnit\Framework\TestCase;
+use PHPUnit\Runner\Version;
+
+final class ConflictingPhpParserLibraryTest extends TestCase
+{
+    public function testItShouldNotConflictWhenIncludingPhpParserManually(): void
+    {
+        if (Version::id() >= 12) {
+            $this->markTestSkipped('This test requires PHPUnit < 12');
+        }
+
+        include_once dirname(__DIR__, 1) . '/vendor/nikic/php-parser/lib/PhpParser/Parser.php';
+
+        $this->assertTrue(true);
+    }
+}
\ No newline at end of file