diff --git a/composer.json b/composer.json
index a9e8409..6373703 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5",
-        "fakerphp/faker": "^1.10",
+        "fakerphp/faker": "^1.15",
         "phpstan/phpstan": "^0.12.49",
         "http-interop/http-factory-guzzle": "^1.0",
         "squizlabs/php_codesniffer": "^3.5"
diff --git a/tests/Action/ActionTraitTest.php b/tests/Action/ActionTraitTest.php
index b385170..9c9abfe 100644
--- a/tests/Action/ActionTraitTest.php
+++ b/tests/Action/ActionTraitTest.php
@@ -46,9 +46,9 @@ public function testExecute(): void
         $this->requestFactory->expects(self::once())->method('createGetRequest')->with($uri)
             ->willReturn($request);
 
-        $filterKey = $this->faker()->slug;
-        $filterValue = $this->faker()->word;
-        if ($this->faker()->boolean) {
+        $filterKey = $this->faker()->slug();
+        $filterValue = $this->faker()->word();
+        if ($this->faker()->boolean()) {
             $this->request->filter($filterKey, $filterValue);
         } else {
             $this->request->filter([$filterKey => $filterValue]);
@@ -58,9 +58,9 @@ public function testExecute(): void
         $request->expects(self::once())->method('filter')->willReturn($filterCollection);
         $filterCollection->expects(self::once())->method('set')->with($filterKey, $filterValue);
 
-        $paginationKey = $this->faker()->slug;
+        $paginationKey = $this->faker()->slug();
         $paginationValue = $this->faker()->numberBetween();
-        if ($this->faker()->boolean) {
+        if ($this->faker()->boolean()) {
             $this->request->pagination($paginationKey, $paginationValue);
         } else {
             $this->request->pagination([$paginationKey => $paginationValue]);
@@ -69,9 +69,9 @@ public function testExecute(): void
         $request->expects(self::once())->method('pagination')->willReturn($paginationCollection);
         $paginationCollection->expects(self::once())->method('set')->with($paginationKey, $paginationValue);
 
-        $sortField = $this->faker()->slug;
-        $sortDirection = $this->faker()->slug;
-        if ($this->faker()->boolean) {
+        $sortField = $this->faker()->slug();
+        $sortDirection = $this->faker()->slug();
+        if ($this->faker()->boolean()) {
             $this->request->sort($sortField, $sortDirection);
         } else {
             $this->request->sort([$sortField => $sortDirection]);
diff --git a/tests/Exception/ResponseValidationExceptionTest.php b/tests/Exception/ResponseValidationExceptionTest.php
index f461bf6..c935f73 100644
--- a/tests/Exception/ResponseValidationExceptionTest.php
+++ b/tests/Exception/ResponseValidationExceptionTest.php
@@ -35,7 +35,7 @@ public function provideScenarios(): Generator
             ResponseValidationException::CODE_RESOURCE_MISSING
         ];
         yield [
-            ResponseValidationException::typeMismatch($response, $faker->slug, $faker->slug, $faker->numberBetween()),
+            ResponseValidationException::typeMismatch($response, $faker->slug(), $faker->slug(), $faker->numberBetween()),
             ResponseValidationException::CODE_TYPE_MISMATCH
         ];
         yield [
diff --git a/tests/Factory/Oauth2/CredentialFactoryTest.php b/tests/Factory/Oauth2/CredentialFactoryTest.php
index 7cc21cd..696fec6 100644
--- a/tests/Factory/Oauth2/CredentialFactoryTest.php
+++ b/tests/Factory/Oauth2/CredentialFactoryTest.php
@@ -20,8 +20,8 @@ public function testConversion(): void
         $response->method('getBody')->willReturn($stream);
 
         $responseData = [
-            'token_type' => $this->faker()->slug,
-            'access_token' => $this->faker()->md5,
+            'token_type' => $this->faker()->slug(),
+            'access_token' => $this->faker()->md5(),
             'expires_in' => $this->faker()->numberBetween(),
         ];
         $stream->method('getContents')->willReturn(json_encode($responseData));
@@ -43,8 +43,8 @@ public function testInvalidExpirationInterval(): void
         $response->method('getBody')->willReturn($stream);
 
         $responseData = [
-            'token_type' => $this->faker()->slug,
-            'access_token' => $this->faker()->md5,
+            'token_type' => $this->faker()->slug(),
+            'access_token' => $this->faker()->md5(),
             'expires_in' => -1 * $this->faker()->numberBetween(),
         ];
         $stream->method('getContents')->willReturn(json_encode($responseData));
@@ -88,7 +88,7 @@ public function testInvalidJson(): void
         $stream = $this->createMock(StreamInterface::class);
         $response->method('getBody')->willReturn($stream);
 
-        $stream->method('getContents')->willReturn($this->faker()->text);
+        $stream->method('getContents')->willReturn($this->faker()->text());
 
         $this->expectExceptionObject(AuthenticationException::unableToDecodeResponse()->setResponse($response));
         (new CredentialFactory())->fromAuthorityResponse($response);
@@ -100,7 +100,7 @@ public function testErrorResponse(): void
         $stream = $this->createMock(StreamInterface::class);
         $response->method('getBody')->willReturn($stream);
 
-        $errorSlug = $this->faker()->slug;
+        $errorSlug = $this->faker()->slug();
         $stream->method('getContents')->willReturn(json_encode(['error' => $errorSlug]));
 
         $this->expectExceptionObject(AuthenticationException::failed($errorSlug)->setResponse($response));
diff --git a/tests/Factory/RequestFactoryTest.php b/tests/Factory/RequestFactoryTest.php
index 5a6e1ea..5e1b92a 100644
--- a/tests/Factory/RequestFactoryTest.php
+++ b/tests/Factory/RequestFactoryTest.php
@@ -14,7 +14,7 @@ class RequestFactoryTest extends TestCase
 
     protected function setUp(): void
     {
-        $this->baseUrl = 'http://' . $this->faker()->domainName . '/' . $this->faker()->slug;
+        $this->baseUrl = 'http://' . $this->faker()->domainName() . '/' . $this->faker()->slug();
         $this->requestFactory = new RequestFactory(new Uri($this->baseUrl));
     }
 
@@ -26,8 +26,8 @@ public function providesRequestData(): array
          *     [<expected values>]
          * ]
          */
-        $type = $this->faker()->word;
-        $relationshipType = $this->faker()->word;
+        $type = $this->faker()->word();
+        $relationshipType = $this->faker()->word();
         $id = $this->faker()->randomNumber(5);
         return [
             [ #0
@@ -176,15 +176,15 @@ public function testCreateDeleteRequest(array $params, array $expected): void
 
     public function testWithUserInfo(): void
     {
-        $this->baseUrl = 'http://' . $this->faker()->domainName . '/' . $this->faker()->slug . '?foo2=bar2';
+        $this->baseUrl = 'http://' . $this->faker()->domainName() . '/' . $this->faker()->slug() . '?foo2=bar2';
         $this->requestFactory = new RequestFactory(new Uri($this->baseUrl));
 
-        $user = $this->faker()->userName;
-        $pass = $this->faker()->userName;
+        $user = $this->faker()->userName();
+        $pass = $this->faker()->userName();
 
-        $type = $this->faker()->slug;
+        $type = $this->faker()->slug();
         $id = (string) $this->faker()->numberBetween();
-        $uri = sprintf('http://%s:%s@%s/%s/%s?foo=bar', $user, $pass, $this->faker()->domainName, $type, $id);
+        $uri = sprintf('http://%s:%s@%s/%s/%s?foo=bar', $user, $pass, $this->faker()->domainName(), $type, $id);
         $request = $this->requestFactory->createGetRequest(new Uri($uri), $type);
         $this->assertEquals($type, $request->type());
         $this->assertEquals($id, $request->id());
diff --git a/tests/JsonApiClientTest.php b/tests/JsonApiClientTest.php
index 6d2edcb..a5889ad 100644
--- a/tests/JsonApiClientTest.php
+++ b/tests/JsonApiClientTest.php
@@ -50,7 +50,7 @@ protected function setUp(): void
     public function testExecute(): void
     {
         $request = $this->createMock(RequestInterface::class);
-        $method = $this->faker()->slug;
+        $method = $this->faker()->slug();
 
         $request->expects(self::once())->method('method')->willReturn($method);
         $uri = $this->createMock(UriInterface::class);
@@ -61,8 +61,8 @@ public function testExecute(): void
         $httpRequest = $this->createMock(\Psr\Http\Message\RequestInterface::class);
         $this->requestFactory->method('createRequest')->with($method, $uri)->willReturn($httpRequest);
 
-        $headerKey = $this->faker()->slug;
-        $headerValue = $this->faker()->slug;
+        $headerKey = $this->faker()->slug();
+        $headerValue = $this->faker()->slug();
         $header = new KeyValueCollection([$headerKey => $headerValue]);
         $request->expects(self::once())->method('headers')->willReturn($header);
 
@@ -71,7 +71,7 @@ public function testExecute(): void
         $document = $this->createMock(DocumentInterface::class);
         $request->expects(self::atLeastOnce())->method('document')->willReturn($document);
 
-        $data = [$this->faker()->text];
+        $data = [$this->faker()->text()];
         $this->serializer->method('serializeDocument')->with($document)->willReturn($data);
 
         $stream = $this->createMock(StreamInterface::class);
@@ -100,7 +100,7 @@ public function testExecute(): void
     public function testFailedSerialization(): void
     {
         $request = $this->createMock(RequestInterface::class);
-        $method = $this->faker()->slug;
+        $method = $this->faker()->slug();
 
         $request->expects(self::once())->method('method')->willReturn($method);
         $uri = $this->createMock(UriInterface::class);
@@ -109,8 +109,8 @@ public function testFailedSerialization(): void
         $httpRequest = $this->createMock(\Psr\Http\Message\RequestInterface::class);
         $this->requestFactory->method('createRequest')->with($method, $uri)->willReturn($httpRequest);
 
-        $headerKey = $this->faker()->slug;
-        $headerValue = $this->faker()->slug;
+        $headerKey = $this->faker()->slug();
+        $headerValue = $this->faker()->slug();
         $header = new KeyValueCollection([$headerKey => $headerValue]);
         $request->expects(self::once())->method('headers')->willReturn($header);
 
diff --git a/tests/Middleware/AuthenticationMiddlewareTest.php b/tests/Middleware/AuthenticationMiddlewareTest.php
index f979488..adebc3b 100644
--- a/tests/Middleware/AuthenticationMiddlewareTest.php
+++ b/tests/Middleware/AuthenticationMiddlewareTest.php
@@ -31,9 +31,9 @@ protected function setUp(): void
     public function testOAuth2(): void
     {
         $oauth2Credentials = new OAuth2Credentials(
-            $this->faker()->slug,
-            $this->faker()->md5,
-            $this->faker()->dateTime
+            $this->faker()->slug(),
+            $this->faker()->md5(),
+            $this->faker()->dateTime()
         );
 
         $this->authMiddleware->setOAuth2Credentials($oauth2Credentials);
@@ -47,8 +47,8 @@ public function testOAuth2(): void
     public function testBasic(): void
     {
         $basicCredentials = new BasicCredentials(
-            $this->faker()->userName,
-            $this->faker()->password,
+            $this->faker()->userName(),
+            $this->faker()->password(),
         );
 
         $this->authMiddleware->setBasicCredentials($basicCredentials);
diff --git a/tests/Model/Auth2CredentialsTest.php b/tests/Model/Auth2CredentialsTest.php
index a111ce1..efb8f1d 100644
--- a/tests/Model/Auth2CredentialsTest.php
+++ b/tests/Model/Auth2CredentialsTest.php
@@ -28,8 +28,8 @@ public function testIsExpired(): void
     private function createModel(?DateTimeInterface $dateTime): OAuth2Credentials
     {
         return new OAuth2Credentials(
-            $this->faker()->slug,
-            $this->faker()->md5,
+            $this->faker()->slug(),
+            $this->faker()->md5(),
             $dateTime
         );
     }
diff --git a/tests/Model/BasicCredentialsTest.php b/tests/Model/BasicCredentialsTest.php
index 002f461..8efd471 100644
--- a/tests/Model/BasicCredentialsTest.php
+++ b/tests/Model/BasicCredentialsTest.php
@@ -9,8 +9,8 @@ class BasicCredentialsTest extends TestCase
 {
     public function test(): void
     {
-        $username = $this->faker()->userName;
-        $password = $this->faker()->password;
+        $username = $this->faker()->userName();
+        $password = $this->faker()->password();
 
         $credentials = new BasicCredentials($username, $password);
         $this->assertEquals($username, $credentials->username);
diff --git a/tests/Response/ResponseFactoryTest.php b/tests/Response/ResponseFactoryTest.php
index 64ab6de..22e9182 100644
--- a/tests/Response/ResponseFactoryTest.php
+++ b/tests/Response/ResponseFactoryTest.php
@@ -35,7 +35,7 @@ public function testCreateResponse(): void
         $stream = $this->createMock(StreamInterface::class);
         $psrResponse->expects(self::exactly(2))->method('getBody')->willReturn($stream);
 
-        $responseBody = [$this->faker()->text];
+        $responseBody = [$this->faker()->text()];
         $responseBodyEncoded = json_encode($responseBody);
         $stream->expects(self::once())->method('getContents')->willReturn($responseBodyEncoded);
         $stream->expects(self::once())->method('rewind');
@@ -43,7 +43,7 @@ public function testCreateResponse(): void
         $httpStatus = 200;
         $psrResponse->method('getStatusCode')->willReturn($httpStatus);
         $headers = [
-            $this->faker()->word => $this->faker()->word,
+            $this->faker()->word() => $this->faker()->word(),
         ];
         $psrResponse->method('getHeaders')->willReturn($headers);
 
@@ -101,7 +101,7 @@ public function testCreateErrorResponseThrowsNoInvalidJson(): void
         $psrResponse->expects(self::exactly(2))->method('getBody')->willReturn($stream);
 
         $headers = [
-            $this->faker()->word => $this->faker()->word,
+            $this->faker()->word() => $this->faker()->word(),
         ];
         $psrResponse->method('getHeaders')->willReturn($headers);
 
@@ -139,11 +139,11 @@ public function testCreateErrorResponseContainsValidJsonResponse(): void
         $psrResponse->expects(self::exactly(2))->method('getBody')->willReturn($stream);
 
         $headers = [
-            $this->faker()->word => $this->faker()->word,
+            $this->faker()->word() => $this->faker()->word(),
         ];
         $psrResponse->method('getHeaders')->willReturn($headers);
 
-        $responseBody = [$this->faker()->text];
+        $responseBody = [$this->faker()->text()];
         $responseBodyEncoded = json_encode($responseBody);
         $stream->expects(self::once())->method('getContents')->willReturn($responseBodyEncoded);
         $stream->expects(self::once())->method('rewind');
diff --git a/tests/Service/OAuth2AuthenticatorTest.php b/tests/Service/OAuth2AuthenticatorTest.php
index 811a31e..6a5d21b 100644
--- a/tests/Service/OAuth2AuthenticatorTest.php
+++ b/tests/Service/OAuth2AuthenticatorTest.php
@@ -41,8 +41,8 @@ protected function setUp(): void
     public function test(): void
     {
         $endpointUri = $this->createMock(UriInterface::class);
-        $clientId = $this->faker()->uuid;
-        $clientSecret = $this->faker()->password;
+        $clientId = $this->faker()->uuid();
+        $clientSecret = $this->faker()->password();
 
         $payload = [
             'grant_type' => 'client_credentials',
@@ -78,7 +78,7 @@ public function test(): void
     public function testInvalidPayload(): void
     {
         $endpointUri = $this->createMock(UriInterface::class);
-        $clientId = $this->faker()->uuid;
+        $clientId = $this->faker()->uuid();
         $clientSecret = utf8_decode('äöä');
 
         json_encode($clientSecret);
@@ -89,8 +89,8 @@ public function testInvalidPayload(): void
     public function testHttpError(): void
     {
         $endpointUri = $this->createMock(UriInterface::class);
-        $clientId = $this->faker()->uuid;
-        $clientSecret = $this->faker()->password;
+        $clientId = $this->faker()->uuid();
+        $clientSecret = $this->faker()->password();
 
         $payload = [
             'grant_type' => 'client_credentials',
diff --git a/tests/Validator/ResponseValidatorTest.php b/tests/Validator/ResponseValidatorTest.php
index 7d12e99..b859f60 100644
--- a/tests/Validator/ResponseValidatorTest.php
+++ b/tests/Validator/ResponseValidatorTest.php
@@ -51,7 +51,7 @@ public function testAssertNoDocumentThrowsException(): void
     public function testAssertDataNotEmpty(): void
     {
         $this->responseValidator->assertDataNotEmpty($this->createResponse(new Document([new Resource(
-            $this->faker()->slug
+            $this->faker()->slug()
         )])));
         $this->assertTrue(true);
     }
@@ -66,7 +66,7 @@ public function testAssertDataNotEmptyThrowsException(): void
 
     public function testAssertResourcesMatchTypeAndContainIds(): void
     {
-        $type = $this->faker()->slug;
+        $type = $this->faker()->slug();
         $response = $this->createResponse(new Document([new Resource(
             $type,
             (string) $this->faker()->numberBetween()
@@ -77,8 +77,8 @@ public function testAssertResourcesMatchTypeAndContainIds(): void
 
     public function testAssertResourcesMatchTypeAndContainIdsThrowsExceptionDueToType(): void
     {
-        $expectedType = $this->faker()->slug;
-        $actualType = $this->faker()->slug;
+        $expectedType = $this->faker()->slug();
+        $actualType = $this->faker()->slug();
         $response = $this->createResponse(new Document([new Resource(
             $actualType,
             (string) $this->faker()->numberBetween()
@@ -91,7 +91,7 @@ public function testAssertResourcesMatchTypeAndContainIdsThrowsExceptionDueToTyp
 
     public function testAssertResourcesMatchTypeAndContainIdsThrowsExceptionDueToId(): void
     {
-        $expectedType = $this->faker()->slug;
+        $expectedType = $this->faker()->slug();
         $response = $this->createResponse(new Document([new Resource(
             $expectedType
         )]));
@@ -103,7 +103,7 @@ public function testAssertResourcesMatchTypeAndContainIdsThrowsExceptionDueToId(
 
     public function testAssertScalarResultWithId(): void
     {
-        $type = $this->faker()->slug;
+        $type = $this->faker()->slug();
         $response = $this->createResponse(new Document([new Resource(
             $type,
             (string) $this->faker()->numberBetween()
@@ -114,7 +114,7 @@ public function testAssertScalarResultWithId(): void
 
     public function testAssertScalarResultWithIdThrowsException(): void
     {
-        $type = $this->faker()->slug;
+        $type = $this->faker()->slug();
         $response = $this->createResponse(new Document([
             new Resource($type, (string) $this->faker()->numberBetween()),
             new Resource($type, (string) $this->faker()->numberBetween()),