diff --git a/src/Stubs/Symfony/StubFilesExtensionLoader.php b/src/Stubs/Symfony/StubFilesExtensionLoader.php
index 9b4ea3be..4e345147 100644
--- a/src/Stubs/Symfony/StubFilesExtensionLoader.php
+++ b/src/Stubs/Symfony/StubFilesExtensionLoader.php
@@ -68,13 +68,17 @@ public function getFiles(): array
 			$files[] = $stubsDir . '/Symfony/Component/HttpFoundation/Cookie.stub';
 		}
 
-		if ($this->isInstalledVersionBelow('symfony/http-foundation', '7.4.0.0')) {
+		// keys() returns int keys for numeric parameter names until symfony/http-foundation 8.2 casts them to string
+		if ($this->isInstalledVersionBelow('symfony/http-foundation', '8.2.0.0')) {
 			$files[] = $stubsDir . '/Symfony/Component/HttpFoundation/ParameterBag.stub';
+		}
 
-			if (!$this->isInstalledVersionBelow('symfony/http-foundation', '5.1.0.0')) {
-				$files[] = $stubsDir . '/Symfony/Component/HttpFoundation/InputBag.stub';
-				$files[] = $stubsDir . '/Symfony/Component/HttpFoundation/Request.stub';
-			}
+		if (
+			$this->isInstalledVersionBelow('symfony/http-foundation', '7.4.0.0')
+			&& !$this->isInstalledVersionBelow('symfony/http-foundation', '5.1.0.0')
+		) {
+			$files[] = $stubsDir . '/Symfony/Component/HttpFoundation/InputBag.stub';
+			$files[] = $stubsDir . '/Symfony/Component/HttpFoundation/Request.stub';
 		}
 
 		if ($this->isInstalledVersionBelow('symfony/messenger', '6.1.0.0')) {
diff --git a/stubs/Symfony/Component/HttpFoundation/ParameterBag.stub b/stubs/Symfony/Component/HttpFoundation/ParameterBag.stub
index e412e9e0..345fce90 100644
--- a/stubs/Symfony/Component/HttpFoundation/ParameterBag.stub
+++ b/stubs/Symfony/Component/HttpFoundation/ParameterBag.stub
@@ -7,6 +7,13 @@ namespace Symfony\Component\HttpFoundation;
  */
 class ParameterBag implements \IteratorAggregate
 {
+    /**
+     * @return array<mixed>
+     */
+    public function all(?string $key = null): array
+    {
+    }
+
     /**
      * @return list<array-key>
      */
diff --git a/tests/Type/Symfony/ExtensionTest.php b/tests/Type/Symfony/ExtensionTest.php
index 7e965cf5..84b28bb4 100644
--- a/tests/Type/Symfony/ExtensionTest.php
+++ b/tests/Type/Symfony/ExtensionTest.php
@@ -25,6 +25,7 @@ public function dataFileAsserts(): iterable
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/traceable_message_bus.php');
 
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/header_bag_get.php');
+		yield from $this->gatherAssertTypes(__DIR__ . '/data/parameter_bag.php');
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/response_header_bag_get_cookies.php');
 
 		if (class_exists('Symfony\Component\HttpFoundation\InputBag')) {
diff --git a/tests/Type/Symfony/data/parameter_bag.php b/tests/Type/Symfony/data/parameter_bag.php
new file mode 100644
index 00000000..4f3b7c91
--- /dev/null
+++ b/tests/Type/Symfony/data/parameter_bag.php
@@ -0,0 +1,13 @@
+<?php declare(strict_types = 1);
+
+use function PHPStan\Testing\assertType;
+
+$bag = new \Symfony\Component\HttpFoundation\ParameterBag(['foo' => 'bar']);
+
+assertType('list<(int|string)>', $bag->keys());
+assertType('array<mixed>', $bag->all());
+assertType('array<mixed>', $bag->all('foo'));
+
+foreach ($bag as $key => $value) {
+	assertType('(int|string)', $key);
+}