diff --git a/composer.json b/composer.json
index 7ac3191..6806ef4 100644
--- a/composer.json
+++ b/composer.json
@@ -25,14 +25,14 @@
     "require": {
         "php": "^8.0",
         "ext-json": "*",
-        "league/openapi-psr7-validator": "^0.21",
+        "league/openapi-psr7-validator": "^0.22",
         "nyholm/psr7": "^1.3.1",
         "psr/cache": "^1.0 || ^2.0 || ^3.0",
-        "psr/http-message": "^1.0",
+        "psr/http-message": "^1.0 || ^2.0",
         "psr/simple-cache": "^1.0 || ^2.0 || ^3.0",
         "symfony/cache": "^5.0.9 || ^6.0 || ^7.0",
         "symfony/http-foundation": "^5.0.9 || ^6.0 || ^7.0",
-        "symfony/psr-http-message-bridge": "^2.0.1 || ^7.0"
+        "symfony/psr-http-message-bridge": "^2.0 || ^6.0 || ^7.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.17",
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 2aaece9..9ea7361 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -7,6 +7,7 @@
 use Nyholm\Psr7\Factory\Psr17Factory;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Message\StreamInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 
@@ -42,7 +43,10 @@ protected function psr7Response(?array $content = null): ResponseInterface
             return $response;
         }
 
-        $response->method('getBody')->willReturn(json_encode($content, JSON_THROW_ON_ERROR));
+        $body = $this->createMock(StreamInterface::class);
+        $body->method('__toString')->willReturn(json_encode($content, JSON_THROW_ON_ERROR));
+
+        $response->method('getBody')->willReturn($body);
         $response->method('getStatusCode')->willReturn(Response::HTTP_OK);
         $response->method('getHeader')->willReturn(['application/json']);