diff --git a/depfile.yaml b/depfile.yaml
index 43446a1..66a3c52 100644
--- a/depfile.yaml
+++ b/depfile.yaml
@@ -115,6 +115,7 @@ ruleset:
     - "PSR HTTP"
     - "PSR HTTP Discovery"
     - PHPUnit
+    - Guzzle
   "HTTP Mock Util": ~
   "HTTP Mock PSR Middleware":
     - "PSR HTTP"
diff --git a/src/Request/SerializableRequest.php b/src/Request/SerializableRequest.php
index 42c0f96..f3fdcf4 100644
--- a/src/Request/SerializableRequest.php
+++ b/src/Request/SerializableRequest.php
@@ -2,6 +2,8 @@
 namespace InterNations\Component\HttpMock\Request;
 
 use Serializable;
+use Symfony\Component\HttpFoundation\File\UploadedFile;
+use Symfony\Component\HttpFoundation\FileBag;
 use Symfony\Component\HttpFoundation\Request;
 
 class SerializableRequest extends Request implements Serializable
@@ -9,12 +11,26 @@ class SerializableRequest extends Request implements Serializable
     public function serialize(): string
     {
         $this->getContent();
+        $files = [];
+
+        if ($this->files) {
+            foreach ($this->files as $key => $file) {
+                // Move the file in another directory
+                $path = sys_get_temp_dir() . DIRECTORY_SEPARATOR . md5($file->getPathname());
+                $file->move(sys_get_temp_dir(), md5($file->getPathname()));
+                $files[$key] = [
+                    'originalName' => $file->getClientOriginalName(),
+                    'pathName' => $path,
+                ];
+            }
+        }
+
         return serialize([
             'attributes' => $this->attributes,
             'request' => $this->request,
             'query' => $this->query,
             'server' => $this->server,
-            'files' => $this->files,
+            'files' => $files,
             'cookies' => $this->cookies,
             'headers' => $this->headers,
             'content' => $this->content,
@@ -43,7 +59,16 @@ public function unserialize($data): void // @codingStandardsIgnoreLine
         $this->request = $attributes['request'];
         $this->query = $attributes['query'];
         $this->server = $attributes['server'];
-        $this->files = $attributes['files'];
+        $files = $attributes['files'];
+        $this->files = [];
+
+        if ($files) {
+            foreach($files as $key => $file) {
+                $this->files[$key] = new UploadedFile($file['pathName'], $file['originalName'], null, null, true);
+            }
+        }
+
+        $this->files = new FileBag($this->files);
         $this->cookies = $attributes['cookies'];
         $this->headers = $attributes['headers'];
         $this->content = $attributes['content'];
diff --git a/tests/PHPUnit/HttpMockPHPUnitIntegrationTest.php b/tests/PHPUnit/HttpMockPHPUnitIntegrationTest.php
index f8b5db9..64b7e86 100644
--- a/tests/PHPUnit/HttpMockPHPUnitIntegrationTest.php
+++ b/tests/PHPUnit/HttpMockPHPUnitIntegrationTest.php
@@ -1,8 +1,11 @@
 <?php
 namespace InterNations\Component\HttpMock\Tests\PHPUnit;
 
+use GuzzleHttp\Psr7\FnStream;
+use GuzzleHttp\Psr7\MultipartStream;
 use InterNations\Component\HttpMock\PHPUnit\HttpMock;
 use InterNations\Component\HttpMock\Tests\TestCase;
+use Symfony\Component\HttpFoundation\File\File;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use function http_build_query;
@@ -32,6 +35,15 @@ public function tearDown(): void
         $this->tearDownHttpMock();
     }
 
+    /**
+     * Get the content of the file.
+     * @param $file File The file from which get the content
+     * @return false|string The file content or false on error.
+     */
+    private function getFileContent(File $file) {
+        return file_get_contents($file->getPathname());
+    }
+
     /** @return array<array{0:string}> */
     public static function getPaths(): array
     {
@@ -272,6 +284,111 @@ public function testPostRequest(): void
         self::assertSame('post-value', $this->http->requests->latest()->request->get('post-key'));
     }
 
+    public function testPostRequestWithFile(): void
+    {
+        $this->http->mock
+            ->when()
+                ->methodIs('POST')
+            ->then()
+                ->body('BODY')
+            ->statusCode(201)
+                ->header('X-Foo', 'Bar')
+            ->end();
+        $this->http->setUp();
+
+        $streamFactory = $this->getStreamFactory();
+
+        $f1 = FnStream::decorate($streamFactory->createStream('file-content'), [
+            'getMetadata' => static function () {
+                return '/foo/bar.txt';
+            },
+        ]);
+
+        $multipartStream = new MultipartStream([
+            [
+                'name'     => 'post-key',
+                'contents' => 'post-value',
+            ],
+            [
+                'name'     => 'foo',
+                'contents' => $f1,
+            ],
+        ]);
+        $boundary = $multipartStream->getBoundary();
+
+        $response = $this->http->client->sendRequest(
+            $this->getServerRequestFactory()
+                ->createServerRequest('POST', '/')
+                ->withHeader('Content-Type', 'multipart/form-data; boundary=' . $boundary)
+                ->withBody($multipartStream)
+        );
+
+        $latestRequest = $this->http->requests->latest();
+        self::assertSame('BODY', (string) $response->getBody());
+        self::assertSame(201, $response->getStatusCode());
+        self::assertSame('Bar', $response->getHeaderLine('X-Foo'));
+        self::assertSame('post-value', $latestRequest->request->get('post-key'));
+        self::assertSame('file-content', $this->getFileContent($latestRequest->files->get('foo')));
+    }
+
+    public function testPostRequestWithMultipleFiles(): void
+    {
+        $this->http->mock
+            ->when()
+            ->methodIs('POST')
+            ->then()
+            ->body('BODY')
+            ->statusCode(201)
+            ->header('X-Foo', 'Bar')
+            ->end();
+        $this->http->setUp();
+
+        $streamFactory = $this->getStreamFactory();
+
+        $f1 = FnStream::decorate($streamFactory->createStream('first-file-content'), [
+            'getMetadata' => static function () {
+                return '/foo/bar.txt';
+            },
+        ]);
+
+        $f2 = FnStream::decorate($streamFactory->createStream('second-file-content'), [
+            'getMetadata' => static function () {
+                return '/foo/baz.txt';
+            },
+        ]);
+
+        $multipartStream = new MultipartStream([
+            [
+                'name'     => 'post-key',
+                'contents' => 'post-value',
+            ],
+            [
+                'name'     => 'foo',
+                'contents' => $f1,
+            ],
+            [
+                'name'     => 'bar',
+                'contents' => $f2,
+            ],
+        ]);
+        $boundary = $multipartStream->getBoundary();
+
+        $response = $this->http->client->sendRequest(
+            $this->getServerRequestFactory()
+                ->createServerRequest('POST', '/')
+                ->withHeader('Content-Type', 'multipart/form-data; boundary=' . $boundary)
+                ->withBody($multipartStream)
+        );
+
+        $latestRequest = $this->http->requests->latest();
+        self::assertSame('BODY', (string) $response->getBody());
+        self::assertSame(201, $response->getStatusCode());
+        self::assertSame('Bar', $response->getHeaderLine('X-Foo'));
+        self::assertSame('post-value', $latestRequest->request->get('post-key'));
+        self::assertSame('first-file-content', $this->getFileContent($latestRequest->files->get('foo')));
+        self::assertSame('second-file-content', $this->getFileContent($latestRequest->files->get('bar')));
+    }
+
     public function testCountRequests(): void
     {
         $this->http->mock
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 91eec83..c81d653 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase as PhpUnitTestCase;
 use Psr\Http\Message\RequestFactoryInterface;
 use Psr\Http\Message\ResponseFactoryInterface;
+use Psr\Http\Message\ServerRequestFactoryInterface;
 use Psr\Http\Message\StreamFactoryInterface;
 
 abstract class TestCase extends PhpUnitTestCase
@@ -23,4 +24,9 @@ public function getStreamFactory(): StreamFactoryInterface
     {
         return Psr17FactoryDiscovery::findStreamFactory();
     }
+
+    public function getServerRequestFactory(): ServerRequestFactoryInterface
+    {
+        return Psr17FactoryDiscovery::findServerRequestFactory();
+    }
 }