diff --git a/Tests/CurlHttpClientTest.php b/Tests/CurlHttpClientTest.php
index 94f4455..e73e2b6 100644
--- a/Tests/CurlHttpClientTest.php
+++ b/Tests/CurlHttpClientTest.php
@@ -38,8 +38,7 @@ protected function getHttpClient(string $testCase): HttpClientInterface
     public function testBindToPort()
     {
         $client = $this->getHttpClient(__FUNCTION__);
-        $localhost = gethostbyname('localhost');
-        $response = $client->request('GET', "http://$localhost:8057", ['bindto' => "$localhost:9876"]);
+        $response = $client->request('GET', 'http://localhost:8057', ['bindto' => '127.0.0.1:9876']);
         $response->getStatusCode();
 
         $r = new \ReflectionProperty($response, 'handle');
@@ -47,7 +46,7 @@ public function testBindToPort()
 
         $curlInfo = curl_getinfo($r->getValue($response));
 
-        self::assertSame($localhost, $curlInfo['local_ip']);
+        self::assertSame('127.0.0.1', $curlInfo['local_ip']);
         self::assertSame(9876, $curlInfo['local_port']);
     }
 
diff --git a/Tests/HttpClientTestCase.php b/Tests/HttpClientTestCase.php
index c4fb1f0..d5296e1 100644
--- a/Tests/HttpClientTestCase.php
+++ b/Tests/HttpClientTestCase.php
@@ -298,15 +298,13 @@ private static function startVulcain(HttpClientInterface $client)
             self::markTestSkipped('Testing with the "vulcain" is not supported on Windows.');
         }
 
-        $localhost = gethostbyname('localhost');
-
-        if (['application/json'] !== $client->request('GET', "http://$localhost:8057/json")->getHeaders()['content-type']) {
+        if (['application/json'] !== $client->request('GET', 'http://127.0.0.1:8057/json')->getHeaders()['content-type']) {
             self::markTestSkipped('symfony/http-client-contracts >= 2.0.1 required');
         }
 
         $process = new Process(['vulcain'], null, [
             'DEBUG' => 1,
-            'UPSTREAM' => "http://$localhost:8057",
+            'UPSTREAM' => 'http://127.0.0.1:8057',
             'ADDR' => ':3000',
             'KEY_FILE' => __DIR__.'/Fixtures/tls/server.key',
             'CERT_FILE' => __DIR__.'/Fixtures/tls/server.crt',
diff --git a/composer.json b/composer.json
index b3304ec..880798e 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     "require": {
         "php": ">=7.2.5",
         "psr/log": "^1.0",
-        "symfony/http-client-contracts": "~2.2.1|~2.3.2|^2.4.1",
+        "symfony/http-client-contracts": "^2.2",
         "symfony/polyfill-php73": "^1.11",
         "symfony/polyfill-php80": "^1.15",
         "symfony/service-contracts": "^1.0|^2"