diff --git a/composer.json b/composer.json
index 5254148..126f4fb 100644
--- a/composer.json
+++ b/composer.json
@@ -19,12 +19,12 @@
     "require-dev": {
         "nyholm/nsa": "^1.2.1",
         "nyholm/psr7": "^1.3.1",
-        "php-http/guzzle7-adapter": "^0.1.1",
+        "symfony/http-client": "^5.3",
         "phpunit/phpunit": "^9.3"
     },
     "suggest": {
-        "guzzlehttp/psr7": "PSR-7 message implementation that also provides common utility methods",
-        "php-http/curl-client": "cURL client for PHP-HTTP"
+        "nyholm/psr7": "PSR-7 message implementation",
+        "symfony/http-client": "HTTP client"
     },
     "extra": {
         "branch-alias": {
diff --git a/tests/Api/DomainTest.php b/tests/Api/DomainTest.php
index b8942e9..f91ffd1 100644
--- a/tests/Api/DomainTest.php
+++ b/tests/Api/DomainTest.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Api;
 
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Response;
 use Mailgun\Api\Domain;
 use Mailgun\Exception\InvalidArgumentException;
 use Mailgun\Model\Domain\ConnectionResponse;
diff --git a/tests/Api/EmailValidationTest.php b/tests/Api/EmailValidationTest.php
index 7525224..ddd8a69 100644
--- a/tests/Api/EmailValidationTest.php
+++ b/tests/Api/EmailValidationTest.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Api;
 
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Response;
 use Mailgun\Api\EmailValidation;
 
 /**
diff --git a/tests/Api/EmailValidationV4Test.php b/tests/Api/EmailValidationV4Test.php
index 21dddd3..a8586b3 100755
--- a/tests/Api/EmailValidationV4Test.php
+++ b/tests/Api/EmailValidationV4Test.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Api;
 
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Response;
 use Mailgun\Api\EmailValidationV4;
 use Mailgun\Model\EmailValidationV4\CreateBulkJobResponse;
 use Mailgun\Model\EmailValidationV4\CreateBulkPreviewResponse;
diff --git a/tests/Api/EventTest.php b/tests/Api/EventTest.php
index f8a0cdd..cd0e9e8 100644
--- a/tests/Api/EventTest.php
+++ b/tests/Api/EventTest.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Api;
 
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Response;
 use Mailgun\Api\Event;
 use Mailgun\Exception\InvalidArgumentException;
 use Mailgun\Model\Event\EventResponse;
diff --git a/tests/Api/Ip.php b/tests/Api/Ip.php
index 632b976..5bb8c1f 100644
--- a/tests/Api/Ip.php
+++ b/tests/Api/Ip.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Api;
 
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Response;
 use Mailgun\Api\Ip;
 use Mailgun\Model\Ip\IndexResponse;
 
diff --git a/tests/Api/MailingList/MemberTest.php b/tests/Api/MailingList/MemberTest.php
index 8f5f3a6..5ff2251 100644
--- a/tests/Api/MailingList/MemberTest.php
+++ b/tests/Api/MailingList/MemberTest.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Api\MailingList;
 
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Response;
 use Mailgun\Api\MailingList;
 use Mailgun\Exception\InvalidArgumentException;
 use Mailgun\Tests\Api\TestCase;
diff --git a/tests/Api/MailingListTest.php b/tests/Api/MailingListTest.php
index fec1aed..7de6f42 100644
--- a/tests/Api/MailingListTest.php
+++ b/tests/Api/MailingListTest.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Api;
 
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Response;
 use Mailgun\Api\MailingList;
 use Mailgun\Exception\InvalidArgumentException;
 use Mailgun\Model\EmailValidation\ValidateResponse;
diff --git a/tests/Api/MessageTest.php b/tests/Api/MessageTest.php
index b5f66d9..9fb595c 100644
--- a/tests/Api/MessageTest.php
+++ b/tests/Api/MessageTest.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Api;
 
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Response;
 use Mailgun\Api\Message;
 use Mailgun\Model\Message\SendResponse;
 use Mailgun\Model\Message\ShowResponse;
diff --git a/tests/Api/RouteTest.php b/tests/Api/RouteTest.php
index b91d18a..350ea6b 100644
--- a/tests/Api/RouteTest.php
+++ b/tests/Api/RouteTest.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Api;
 
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Response;
 use Mailgun\Api\Route;
 use Mailgun\Model\Route\DeleteResponse;
 use Mailgun\Model\Route\IndexResponse;
diff --git a/tests/Api/StatsTest.php b/tests/Api/StatsTest.php
index 063302f..78d2005 100644
--- a/tests/Api/StatsTest.php
+++ b/tests/Api/StatsTest.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Api;
 
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Response;
 use Mailgun\Exception\InvalidArgumentException;
 use Mailgun\Hydrator\ModelHydrator;
 use Mailgun\Model\Stats\TotalResponse;
diff --git a/tests/Api/TagTest.php b/tests/Api/TagTest.php
index 0221997..51f2bde 100644
--- a/tests/Api/TagTest.php
+++ b/tests/Api/TagTest.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Api;
 
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Response;
 use Mailgun\Api\Tag;
 use Mailgun\Hydrator\ModelHydrator;
 use Mailgun\Model\Tag\IndexResponse;
diff --git a/tests/Api/TestCase.php b/tests/Api/TestCase.php
index b7e6726..255ef93 100644
--- a/tests/Api/TestCase.php
+++ b/tests/Api/TestCase.php
@@ -11,8 +11,8 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Api;
 
-use GuzzleHttp\Psr7\Request;
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Request;
+use Nyholm\Psr7\Response;
 use Mailgun\Hydrator\ModelHydrator;
 use Psr\Http\Client\ClientInterface;
 use Psr\Http\Message\ResponseInterface;
diff --git a/tests/Exception/HttpClientExceptionTest.php b/tests/Exception/HttpClientExceptionTest.php
index 89589da..b50228e 100644
--- a/tests/Exception/HttpClientExceptionTest.php
+++ b/tests/Exception/HttpClientExceptionTest.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Exception;
 
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Response;
 use Mailgun\Exception\HttpClientException;
 use Mailgun\Tests\MailgunTestCase;