diff --git a/composer.json b/composer.json
index 48919f1c..a9fa4bf6 100644
--- a/composer.json
+++ b/composer.json
@@ -24,9 +24,9 @@
         "php": ">=7.2",
         "ext-json": "*",
         "devizzent/cebe-php-openapi": "^1.0",
-        "league/uri": "^6.3",
+        "league/uri": "^6.3 || ^7.0",
         "psr/cache": "^1.0 || ^2.0 || ^3.0",
-        "psr/http-message": "^1.0",
+        "psr/http-message": "^1.0 || ^2.0",
         "psr/http-server-middleware": "^1.0",
         "respect/validation": "^1.1.3 || ^2.0",
         "riverline/multipart-parser": "^2.0.3",
@@ -35,8 +35,8 @@
     },
     "require-dev": {
         "doctrine/coding-standard": "^8.0",
-        "guzzlehttp/psr7": "^1.5",
-        "hansott/psr7-cookies": "^3.0.2",
+        "guzzlehttp/psr7": "^2.0",
+        "hansott/psr7-cookies": "^3.0.2 || ^4.0",
         "phpstan/extension-installer": "^1.0",
         "phpstan/phpstan": "^1",
         "phpstan/phpstan-phpunit": "^1",
diff --git a/phpstan.neon b/phpstan.neon
index 90669f82..da958806 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -5,5 +5,6 @@ parameters:
         - src
         - tests
     treatPhpDocTypesAsCertain: false
+    reportUnmatchedIgnoredErrors: false
     ignoreErrors:
         - '#Call to an undefined static method Respect\\Validation\\Validator::numeric\(\).#'
diff --git a/src/Schema/TypeFormats/StringURI.php b/src/Schema/TypeFormats/StringURI.php
index 8d4bdca9..104998e8 100644
--- a/src/Schema/TypeFormats/StringURI.php
+++ b/src/Schema/TypeFormats/StringURI.php
@@ -12,6 +12,8 @@ class StringURI
     public function __invoke(string $value): bool
     {
         try {
+            // namespace 'League\Uri' is provided by multiple packages, but PHPStan does not support merging them
+            // @phpstan-ignore-next-line
             UriString::parse($value);
 
             return true;
diff --git a/tests/FromCommunity/EmptyObjectValidationTest.php b/tests/FromCommunity/EmptyObjectValidationTest.php
index 4a840dac..2f23c9d4 100644
--- a/tests/FromCommunity/EmptyObjectValidationTest.php
+++ b/tests/FromCommunity/EmptyObjectValidationTest.php
@@ -5,11 +5,10 @@
 namespace League\OpenAPIValidation\Tests\FromCommunity;
 
 use GuzzleHttp\Psr7\ServerRequest;
+use GuzzleHttp\Psr7\Utils;
 use League\OpenAPIValidation\PSR7\ValidatorBuilder;
 use PHPUnit\Framework\TestCase;
 
-use function GuzzleHttp\Psr7\stream_for;
-
 final class EmptyObjectValidationTest extends TestCase
 {
     /**
@@ -40,7 +39,7 @@ public function testIssue57000(): void
 
         $psrRequest = (new ServerRequest('post', 'http://localhost:8000/api/v1/products.create'))
             ->withHeader('Content-Type', 'application/json')
-            ->withBody(stream_for('{}'));
+            ->withBody(Utils::streamFor('{}'));
 
         $validator->validate($psrRequest);
 
diff --git a/tests/FromCommunity/Issue12Test.php b/tests/FromCommunity/Issue12Test.php
index 0781c462..6e7f68cb 100644
--- a/tests/FromCommunity/Issue12Test.php
+++ b/tests/FromCommunity/Issue12Test.php
@@ -5,10 +5,10 @@
 namespace League\OpenAPIValidation\Tests\FromCommunity;
 
 use GuzzleHttp\Psr7\ServerRequest;
+use GuzzleHttp\Psr7\Utils;
 use League\OpenAPIValidation\PSR7\ValidatorBuilder;
 use PHPUnit\Framework\TestCase;
 
-use function GuzzleHttp\Psr7\stream_for;
 use function json_encode;
 
 final class Issue12Test extends TestCase
@@ -61,7 +61,7 @@ public function testIssue12(?array $example): void
 
         $psrRequest = (new ServerRequest('post', 'http://localhost:8000/api/v1/products.create'))
             ->withHeader('Content-Type', 'application/json')
-            ->withBody(stream_for(json_encode(['test' => $example])));
+            ->withBody(Utils::streamFor(json_encode(['test' => $example])));
 
         $validator->validate($psrRequest);
 
diff --git a/tests/FromCommunity/Issue32Test.php b/tests/FromCommunity/Issue32Test.php
index dc91c7cc..52178081 100644
--- a/tests/FromCommunity/Issue32Test.php
+++ b/tests/FromCommunity/Issue32Test.php
@@ -5,11 +5,11 @@
 namespace League\OpenAPIValidation\Tests\FromCommunity;
 
 use GuzzleHttp\Psr7\ServerRequest;
+use GuzzleHttp\Psr7\Utils;
 use League\OpenAPIValidation\PSR7\Exception\ValidationFailed;
 use League\OpenAPIValidation\PSR7\ValidatorBuilder;
 use PHPUnit\Framework\TestCase;
 
-use function GuzzleHttp\Psr7\stream_for;
 use function json_encode;
 
 final class Issue32Test extends TestCase
@@ -51,7 +51,7 @@ enum:
 
         $psrRequest = (new ServerRequest('post', 'http://localhost:8000/api/test/create'))
             ->withHeader('Content-Type', 'application/json')
-            ->withBody(stream_for(json_encode($data)));
+            ->withBody(Utils::streamFor(json_encode($data)));
 
         $serverRequestValidator = (new ValidatorBuilder())->fromYaml($yaml)->getServerRequestValidator();
 
diff --git a/tests/FromCommunity/Issue3Test.php b/tests/FromCommunity/Issue3Test.php
index ae781a7c..80dbc340 100644
--- a/tests/FromCommunity/Issue3Test.php
+++ b/tests/FromCommunity/Issue3Test.php
@@ -5,10 +5,10 @@
 namespace League\OpenAPIValidation\Tests\FromCommunity;
 
 use GuzzleHttp\Psr7\ServerRequest;
+use GuzzleHttp\Psr7\Utils;
 use League\OpenAPIValidation\PSR7\ValidatorBuilder;
 use PHPUnit\Framework\TestCase;
 
-use function GuzzleHttp\Psr7\stream_for;
 use function json_encode;
 
 final class Issue3Test extends TestCase
@@ -52,7 +52,7 @@ public function testIssue3(): void
 
         $psrRequest = (new ServerRequest('post', 'http://localhost:8000/api/v1/products.create'))
             ->withHeader('Content-Type', 'application/json')
-            ->withBody(stream_for(json_encode(['test' => 20])));
+            ->withBody(Utils::streamFor(json_encode(['test' => 20])));
 
         $validator->validate($psrRequest);
 
diff --git a/tests/FromCommunity/Issue50Test.php b/tests/FromCommunity/Issue50Test.php
index 1c3846de..bcf7a23a 100644
--- a/tests/FromCommunity/Issue50Test.php
+++ b/tests/FromCommunity/Issue50Test.php
@@ -5,12 +5,12 @@
 namespace League\OpenAPIValidation\Tests\FromCommunity;
 
 use GuzzleHttp\Psr7\ServerRequest;
+use GuzzleHttp\Psr7\Utils;
 use League\OpenAPIValidation\PSR7\Exception\Validation\InvalidBody;
 use League\OpenAPIValidation\PSR7\ValidatorBuilder;
 use League\OpenAPIValidation\Schema\Exception\KeywordMismatch;
 use PHPUnit\Framework\TestCase;
 
-use function GuzzleHttp\Psr7\stream_for;
 use function json_encode;
 
 final class Issue50Test extends TestCase
@@ -54,7 +54,7 @@ public function testIssue50(): void
         $psrRequest = (new ServerRequest('post', 'http://localhost:8000/api/v1/products.create'))
             ->withHeader('Content-Type', 'application/json')
             ->withBody(
-                stream_for(
+                Utils::streamFor(
                     json_encode(
                         [
                             'body' =>
diff --git a/tests/FromCommunity/Issue57Test.php b/tests/FromCommunity/Issue57Test.php
index f1126259..affba4df 100644
--- a/tests/FromCommunity/Issue57Test.php
+++ b/tests/FromCommunity/Issue57Test.php
@@ -5,10 +5,10 @@
 namespace League\OpenAPIValidation\Tests\FromCommunity;
 
 use GuzzleHttp\Psr7\ServerRequest;
+use GuzzleHttp\Psr7\Utils;
 use League\OpenAPIValidation\PSR7\ValidatorBuilder;
 use PHPUnit\Framework\TestCase;
 
-use function GuzzleHttp\Psr7\stream_for;
 use function json_encode;
 
 final class Issue57Test extends TestCase
@@ -60,7 +60,7 @@ public function testIssue57(): void
 
         $psrRequest = (new ServerRequest('post', 'http://localhost:8000/api/v1/products.create'))
             ->withHeader('Content-Type', 'application/json')
-            ->withBody(stream_for(json_encode(['test' => (object) ['some_property_here' => (object) []]])));
+            ->withBody(Utils::streamFor(json_encode(['test' => (object) ['some_property_here' => (object) []]])));
 
         $validator->validate($psrRequest);
 
diff --git a/tests/PSR7/BaseValidatorTest.php b/tests/PSR7/BaseValidatorTest.php
index bb794e22..6f4e841b 100644
--- a/tests/PSR7/BaseValidatorTest.php
+++ b/tests/PSR7/BaseValidatorTest.php
@@ -8,6 +8,7 @@
 use GuzzleHttp\Psr7\Response;
 use GuzzleHttp\Psr7\ServerRequest;
 use GuzzleHttp\Psr7\Uri;
+use GuzzleHttp\Psr7\Utils;
 use HansOtt\PSR7Cookies\SetCookie;
 use InvalidArgumentException;
 use PHPUnit\Framework\TestCase;
@@ -15,7 +16,6 @@
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 
-use function GuzzleHttp\Psr7\stream_for;
 use function json_encode;
 use function sprintf;
 
@@ -33,7 +33,7 @@ protected function makeGoodResponse(string $path, string $method): ResponseInter
                 return (new Response())
                     ->withHeader('Content-Type', 'application/json')
                     ->withHeader('Header-B', 'good value')
-                    ->withBody(stream_for(json_encode($body)));
+                    ->withBody(Utils::streamFor(json_encode($body)));
 
             case 'post /cookies':
                 $response = (new Response())
@@ -72,7 +72,7 @@ protected function makeGoodServerRequest(string $path, string $method): ServerRe
 
                 return $request
                     ->withHeader('Content-Type', 'application/json')
-                    ->withBody(stream_for(json_encode($body)));
+                    ->withBody(Utils::streamFor(json_encode($body)));
 
             default:
                 throw new InvalidArgumentException(sprintf("unexpected operation '%s %s''", $method, $path));
@@ -104,7 +104,7 @@ protected function makeGoodRequest(string $path, string $method): RequestInterfa
 
                 return $request
                     ->withHeader('Content-Type', 'application/json')
-                    ->withBody(stream_for(json_encode($body)));
+                    ->withBody(Utils::streamFor(json_encode($body)));
 
             default:
                 throw new InvalidArgumentException(sprintf("unexpected operation '%s %s''", $method, $path));
diff --git a/tests/PSR7/CompleteTest.php b/tests/PSR7/CompleteTest.php
index 0fe2c267..24f2b29e 100644
--- a/tests/PSR7/CompleteTest.php
+++ b/tests/PSR7/CompleteTest.php
@@ -6,13 +6,13 @@
 
 use GuzzleHttp\Psr7\Response;
 use GuzzleHttp\Psr7\ServerRequest;
+use GuzzleHttp\Psr7\Utils;
 use League\OpenAPIValidation\PSR7\OperationAddress;
 use League\OpenAPIValidation\PSR7\ValidatorBuilder;
 use PHPUnit\Framework\TestCase;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 
-use function GuzzleHttp\Psr7\stream_for;
 use function json_encode;
 
 use const PHP_INT_MAX;
@@ -56,13 +56,13 @@ protected function buildGoodRequest(): ServerRequestInterface
             ->withCookieParams(['session_id' => 100])
             ->withHeader('X-RequestId', 'abcd')
             ->withHeader('Content-Type', 'application/json')
-            ->withBody(stream_for(json_encode(['propB' => 'good value'])));
+            ->withBody(Utils::streamFor(json_encode(['propB' => 'good value'])));
     }
 
     protected function buildGoodResponse(): ResponseInterface
     {
         return (new Response())
             ->withHeader('Content-Type', 'application/json')
-            ->withBody(stream_for(json_encode(['propA' => PHP_INT_MAX])));
+            ->withBody(Utils::streamFor(json_encode(['propA' => PHP_INT_MAX])));
     }
 }
diff --git a/tests/PSR7/RequestTest.php b/tests/PSR7/RequestTest.php
index 5f652aab..4915e8e5 100644
--- a/tests/PSR7/RequestTest.php
+++ b/tests/PSR7/RequestTest.php
@@ -4,12 +4,12 @@
 
 namespace League\OpenAPIValidation\Tests\PSR7;
 
+use GuzzleHttp\Psr7\Utils;
 use League\OpenAPIValidation\PSR7\Exception\Validation\InvalidBody;
 use League\OpenAPIValidation\PSR7\Exception\Validation\InvalidHeaders;
 use League\OpenAPIValidation\PSR7\OperationAddress;
 use League\OpenAPIValidation\PSR7\ValidatorBuilder;
 
-use function GuzzleHttp\Psr7\stream_for;
 use function json_encode;
 
 final class RequestTest extends BaseValidatorTest
@@ -27,7 +27,7 @@ public function testItValidatesBodyGreen(): void
     {
         $body    = ['name' => 'Alex'];
         $request = $this->makeGoodRequest('/request-body', 'post')
-            ->withBody(stream_for(json_encode($body)));
+            ->withBody(Utils::streamFor(json_encode($body)));
 
         $validator = (new ValidatorBuilder())->fromYamlFile($this->apiSpecFile)->getRequestValidator();
         $validator->validate($request);
@@ -39,7 +39,7 @@ public function testItValidatesBodyHasInvalidPayloadRed(): void
         $addr    = new OperationAddress('/request-body', 'post');
         $body    = ['name' => 1000];
         $request = $this->makeGoodRequest($addr->path(), $addr->method())
-            ->withBody(stream_for(json_encode($body)));
+            ->withBody(Utils::streamFor(json_encode($body)));
 
         $this->expectException(InvalidBody::class);
         $this->expectExceptionMessage(
diff --git a/tests/PSR7/RoutedServerRequestTest.php b/tests/PSR7/RoutedServerRequestTest.php
index cc862c25..8d650062 100644
--- a/tests/PSR7/RoutedServerRequestTest.php
+++ b/tests/PSR7/RoutedServerRequestTest.php
@@ -4,12 +4,12 @@
 
 namespace League\OpenAPIValidation\Tests\PSR7;
 
+use GuzzleHttp\Psr7\Utils;
 use League\OpenAPIValidation\PSR7\Exception\Validation\InvalidBody;
 use League\OpenAPIValidation\PSR7\Exception\Validation\InvalidHeaders;
 use League\OpenAPIValidation\PSR7\OperationAddress;
 use League\OpenAPIValidation\PSR7\ValidatorBuilder;
 
-use function GuzzleHttp\Psr7\stream_for;
 use function json_encode;
 
 final class RoutedServerRequestTest extends BaseValidatorTest
@@ -27,7 +27,7 @@ public function testItValidatesBodyGreen(): void
     {
         $body    = ['name' => 'Alex'];
         $request = $this->makeGoodServerRequest('/request-body', 'post')
-            ->withBody(stream_for(json_encode($body)));
+            ->withBody(Utils::streamFor(json_encode($body)));
 
         $validator = (new ValidatorBuilder())->fromYamlFile($this->apiSpecFile)->getRoutedRequestValidator();
         $validator->validate(new OperationAddress('/request-body', 'post'), $request);
@@ -39,7 +39,7 @@ public function testItValidatesBodyHasInvalidPayloadRed(): void
         $addr    = new OperationAddress('/request-body', 'post');
         $body    = ['name' => 1000];
         $request = $this->makeGoodServerRequest($addr->path(), $addr->method())
-            ->withBody(stream_for(json_encode($body)));
+            ->withBody(Utils::streamFor(json_encode($body)));
 
         $this->expectException(InvalidBody::class);
         $this->expectExceptionMessage(
diff --git a/tests/PSR7/ServerRequestTest.php b/tests/PSR7/ServerRequestTest.php
index 679d57e6..191a4c7b 100644
--- a/tests/PSR7/ServerRequestTest.php
+++ b/tests/PSR7/ServerRequestTest.php
@@ -4,12 +4,12 @@
 
 namespace League\OpenAPIValidation\Tests\PSR7;
 
+use GuzzleHttp\Psr7\Utils;
 use League\OpenAPIValidation\PSR7\Exception\Validation\InvalidBody;
 use League\OpenAPIValidation\PSR7\Exception\Validation\InvalidHeaders;
 use League\OpenAPIValidation\PSR7\OperationAddress;
 use League\OpenAPIValidation\PSR7\ValidatorBuilder;
 
-use function GuzzleHttp\Psr7\stream_for;
 use function json_encode;
 
 final class ServerRequestTest extends BaseValidatorTest
@@ -27,7 +27,7 @@ public function testItValidatesBodyGreen(): void
     {
         $body    = ['name' => 'Alex'];
         $request = $this->makeGoodServerRequest('/request-body', 'post')
-            ->withBody(stream_for(json_encode($body)));
+            ->withBody(Utils::streamFor(json_encode($body)));
 
         $validator = (new ValidatorBuilder())->fromYamlFile($this->apiSpecFile)->getServerRequestValidator();
         $validator->validate($request);
@@ -39,7 +39,7 @@ public function testItValidatesBodyHasInvalidPayloadRed(): void
         $addr    = new OperationAddress('/request-body', 'post');
         $body    = ['name' => 1000];
         $request = $this->makeGoodServerRequest($addr->path(), $addr->method())
-            ->withBody(stream_for(json_encode($body)));
+            ->withBody(Utils::streamFor(json_encode($body)));
 
         $this->expectException(InvalidBody::class);
         $this->expectExceptionMessage(
diff --git a/tests/PSR7/ValidateResponseTest.php b/tests/PSR7/ValidateResponseTest.php
index 28b75d26..c1eacf9c 100644
--- a/tests/PSR7/ValidateResponseTest.php
+++ b/tests/PSR7/ValidateResponseTest.php
@@ -5,12 +5,12 @@
 namespace League\OpenAPIValidation\Tests\PSR7;
 
 use GuzzleHttp\Psr7\Response;
+use GuzzleHttp\Psr7\Utils;
 use League\OpenAPIValidation\PSR7\Exception\Validation\InvalidBody;
 use League\OpenAPIValidation\PSR7\Exception\Validation\InvalidHeaders;
 use League\OpenAPIValidation\PSR7\OperationAddress;
 use League\OpenAPIValidation\PSR7\ValidatorBuilder;
 
-use function GuzzleHttp\Psr7\stream_for;
 use function json_encode;
 
 final class ValidateResponseTest extends BaseValidatorTest
@@ -32,7 +32,7 @@ public function testItValidatesMessageWithReferencesGreen(): void
         ];
         $response = (new Response())
             ->withHeader('Content-Type', 'application/json')
-            ->withBody(stream_for(json_encode($body)));
+            ->withBody(Utils::streamFor(json_encode($body)));
 
         $validator = (new ValidatorBuilder())->fromYamlFile($this->apiSpecFile)->getResponseValidator();
         $validator->validate(new OperationAddress('/ref', 'post'), $response);
@@ -43,7 +43,7 @@ public function testItValidatesBinaryResponseGreen(): void
     {
         $response = $this->makeGoodResponse('/path1', 'get')
                          ->withHeader('Content-Type', 'image/jpeg')
-                         ->withBody(stream_for(__DIR__ . '/../stubs/image.jpg'));
+                         ->withBody(Utils::streamFor(__DIR__ . '/../stubs/image.jpg'));
 
         $validator = (new ValidatorBuilder())->fromYamlFile($this->apiSpecFile)->getResponseValidator();
         $validator->validate(new OperationAddress('/path1', 'get'), $response);
@@ -54,7 +54,7 @@ public function testItValidatesMessageWrongBodyValueRed(): void
     {
         $addr     = new OperationAddress('/path1', 'get');
         $body     = [];
-        $response = $this->makeGoodResponse('/path1', 'get')->withBody(stream_for(json_encode($body)));
+        $response = $this->makeGoodResponse('/path1', 'get')->withBody(Utils::streamFor(json_encode($body)));
 
         $this->expectException(InvalidBody::class);
         $this->expectExceptionMessage(
diff --git a/tests/PSR7/Validators/BodyValidator/MultipartValidatorTest.php b/tests/PSR7/Validators/BodyValidator/MultipartValidatorTest.php
index e93300c0..2e2580e6 100644
--- a/tests/PSR7/Validators/BodyValidator/MultipartValidatorTest.php
+++ b/tests/PSR7/Validators/BodyValidator/MultipartValidatorTest.php
@@ -4,6 +4,7 @@
 
 namespace League\OpenAPIValidation\Tests\PSR7\Validators\BodyValidator;
 
+use GuzzleHttp\Psr7\Message;
 use GuzzleHttp\Psr7\ServerRequest;
 use GuzzleHttp\Psr7\UploadedFile;
 use GuzzleHttp\Psr7\Uri;
@@ -14,7 +15,6 @@
 use Psr\Http\Message\UploadedFileInterface;
 
 use function filesize;
-use function GuzzleHttp\Psr7\parse_request;
 
 class MultipartValidatorTest extends TestCase
 {
@@ -388,7 +388,7 @@ public function testValidateMultipartGreen(string $message): void
     {
         $specFile = __DIR__ . '/../../../stubs/multipart.yaml';
 
-        $request       = parse_request($message); // convert a text HTTP message to a PSR7 message
+        $request       = Message::parseRequest($message); // convert a text HTTP message to a PSR7 message
         $serverRequest = new ServerRequest(
             $request->getMethod(),
             $request->getUri(),
@@ -410,7 +410,7 @@ public function testValidateMultipartRed(string $message, string $expectedExcept
 
         $specFile = __DIR__ . '/../../../stubs/multipart.yaml';
 
-        $request       = parse_request($message); // convert a text HTTP message to a PSR7 message
+        $request       = Message::parseRequest($message); // convert a text HTTP message to a PSR7 message
         $serverRequest = new ServerRequest(
             $request->getMethod(),
             $request->getUri(),
diff --git a/tests/PSR7/Validators/BodyValidatorTest.php b/tests/PSR7/Validators/BodyValidatorTest.php
index e70c8f8d..19c7a0eb 100644
--- a/tests/PSR7/Validators/BodyValidatorTest.php
+++ b/tests/PSR7/Validators/BodyValidatorTest.php
@@ -4,13 +4,12 @@
 
 namespace League\OpenAPIValidation\Tests\PSR7\Validators;
 
+use GuzzleHttp\Psr7\Message;
 use GuzzleHttp\Psr7\ServerRequest;
 use League\OpenAPIValidation\PSR7\Exception\Validation\InvalidBody;
 use League\OpenAPIValidation\PSR7\ValidatorBuilder;
 use PHPUnit\Framework\TestCase;
 
-use function GuzzleHttp\Psr7\parse_request;
-
 class BodyValidatorTest extends TestCase
 {
     /**
@@ -140,7 +139,7 @@ public function dataProviderRed(): array
      */
     public function testValidateGreen(string $specFile, string $message): void
     {
-        $request       = parse_request($message); // convert a text HTTP message to a PSR7 message
+        $request       = Message::parseRequest($message); // convert a text HTTP message to a PSR7 message
         $serverRequest = new ServerRequest(
             $request->getMethod(),
             $request->getUri(),
@@ -158,7 +157,7 @@ public function testValidateGreen(string $specFile, string $message): void
      */
     public function testValidateRed(string $specFile, string $message): void
     {
-        $request       = parse_request($message); // convert a text HTTP message to a PSR7 message
+        $request       = Message::parseRequest($message); // convert a text HTTP message to a PSR7 message
         $serverRequest = new ServerRequest(
             $request->getMethod(),
             $request->getUri(),