diff --git a/composer.json b/composer.json
index a5ac50a..7f0ed21 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "thecodingmachine/safe": "^2.2"
     },
     "require-dev": {
-        "doctrine/coding-standard": "^9",
+        "doctrine/coding-standard": "^10",
         "ergebnis/composer-normalize": "^2.27",
         "infection/infection": "^0.26",
         "phpstan/extension-installer": "^1.1",
diff --git a/src/Exception/NoResponse.php b/src/Exception/NoResponse.php
index ff4967a..ed284c7 100644
--- a/src/Exception/NoResponse.php
+++ b/src/Exception/NoResponse.php
@@ -12,7 +12,7 @@ class NoResponse extends Exception
 {
     protected string $method;
     protected string $path;
-    protected ?string $statusCode = null;
+    protected string|null $statusCode = null;
 
     public static function forPathAndMethod(string $path, string $method): self
     {
diff --git a/src/OpenAPIFaker.php b/src/OpenAPIFaker.php
index a99b6a2..37da04d 100644
--- a/src/OpenAPIFaker.php
+++ b/src/OpenAPIFaker.php
@@ -66,7 +66,7 @@ public static function createFromYaml(string $yaml): self
     public function mockRequest(
         string $path,
         string $method,
-        string $contentType = 'application/json'
+        string $contentType = 'application/json',
     ): mixed {
         $operation = $this->findOperation($path, $method);
 
@@ -93,7 +93,7 @@ public function mockResponse(
         string $path,
         string $method,
         string $statusCode = '200',
-        string $contentType = 'application/json'
+        string $contentType = 'application/json',
     ): mixed {
         $operation = $this->findOperation($path, $method);
 
@@ -119,9 +119,7 @@ public function mockResponse(
         return (new SchemaFaker($content->schema, $this->options))->generate();
     }
 
-    /**
-     * @throws Exception
-     */
+    /** @throws Exception */
     public function mockComponentSchema(string $schemaName): mixed
     {
         if ($this->openAPISchema->components === null) {
@@ -138,9 +136,7 @@ public function mockComponentSchema(string $schemaName): mixed
         return (new SchemaFaker($schema, $this->options))->generate();
     }
 
-    /**
-     * @param array{minItems?:?int, maxItems?:?int, alwaysFakeOptionals?:bool} $options
-     */
+    /** @param array{minItems?:?int, maxItems?:?int, alwaysFakeOptionals?:bool} $options */
     public function setOptions(array $options): self
     {
         foreach ($options as $key => $value) {
@@ -154,15 +150,13 @@ public function setOptions(array $options): self
         return $this;
     }
 
-    /**
-     * @throws NoPath
-     */
+    /** @throws NoPath */
     private function findOperation(string $path, string $method): Operation
     {
         try {
             $operation = (new LeagueOpenAPI\SpecFinder($this->openAPISchema))
                 ->findOperationSpec(new LeagueOpenAPI\OperationAddress($path, strtolower($method)));
-        } catch (LeagueOpenAPI\Exception\NoPath $e) {
+        } catch (LeagueOpenAPI\Exception\NoPath) {
             throw NoPath::forPathAndMethod($path, $method);
         }
 
diff --git a/src/Options.php b/src/Options.php
index 4f6afaa..ada7158 100644
--- a/src/Options.php
+++ b/src/Options.php
@@ -6,8 +6,8 @@
 
 final class Options
 {
-    private ?int $minItems            = null;
-    private ?int $maxItems            = null;
+    private int|null $minItems        = null;
+    private int|null $maxItems        = null;
     private bool $alwaysFakeOptionals = false;
 
     public function setMinItems(int $minItems): Options
@@ -31,12 +31,12 @@ public function setAlwaysFakeOptionals(bool $alwaysFakeOptionals): self
         return $this;
     }
 
-    public function getMinItems(): ?int
+    public function getMinItems(): int|null
     {
         return $this->minItems;
     }
 
-    public function getMaxItems(): ?int
+    public function getMaxItems(): int|null
     {
         return $this->maxItems;
     }
diff --git a/src/SchemaFaker/ArrayFaker.php b/src/SchemaFaker/ArrayFaker.php
index cb87161..d6b2a76 100644
--- a/src/SchemaFaker/ArrayFaker.php
+++ b/src/SchemaFaker/ArrayFaker.php
@@ -15,14 +15,10 @@
 use const SORT_REGULAR;
 use const SORT_STRING;
 
-/**
- * @internal
- */
+/** @internal */
 final class ArrayFaker
 {
-    /**
-     * @return array<mixed>
-     */
+    /** @return array<mixed> */
     public static function generate(Schema $schema, Options $options): array
     {
         $minimum = $schema->minItems ?? 0;
diff --git a/src/SchemaFaker/BooleanFaker.php b/src/SchemaFaker/BooleanFaker.php
index 91c7aa0..02b5d71 100644
--- a/src/SchemaFaker/BooleanFaker.php
+++ b/src/SchemaFaker/BooleanFaker.php
@@ -9,9 +9,7 @@
 
 use function random_int;
 
-/**
- * @internal
- */
+/** @internal */
 final class BooleanFaker
 {
     public static function generate(Schema $schema): bool
diff --git a/src/SchemaFaker/NumberFaker.php b/src/SchemaFaker/NumberFaker.php
index 7075589..e413816 100644
--- a/src/SchemaFaker/NumberFaker.php
+++ b/src/SchemaFaker/NumberFaker.php
@@ -9,9 +9,7 @@
 
 use function mt_getrandmax;
 
-/**
- * @internal
- */
+/** @internal */
 final class NumberFaker
 {
     public static function generate(Schema $schema): int|float
diff --git a/src/SchemaFaker/ObjectFaker.php b/src/SchemaFaker/ObjectFaker.php
index 83b8816..5bdb47b 100644
--- a/src/SchemaFaker/ObjectFaker.php
+++ b/src/SchemaFaker/ObjectFaker.php
@@ -14,14 +14,10 @@
 use function count;
 use function in_array;
 
-/**
- * @internal
- */
+/** @internal */
 final class ObjectFaker
 {
-    /**
-     * @return array<mixed>
-     */
+    /** @return array<mixed> */
     public static function generate(Schema $schema, Options $options, bool $request = false): array
     {
         $result = [];
diff --git a/src/SchemaFaker/SchemaFaker.php b/src/SchemaFaker/SchemaFaker.php
index 03f1e99..671c36d 100644
--- a/src/SchemaFaker/SchemaFaker.php
+++ b/src/SchemaFaker/SchemaFaker.php
@@ -16,26 +16,18 @@
 use function Safe\json_decode;
 use function Safe\json_encode;
 
-/**
- * @internal
- */
+/** @internal */
 final class SchemaFaker
 {
     private Schema $schema;
-    private Options $options;
-    private bool $request;
 
-    public function __construct(Schema $schema, Options $options, bool $request = false)
+    public function __construct(Schema $schema, private Options $options, private bool $request = false)
     {
-        $schemaData    = json_decode(json_encode($schema->getSerializableData()), true);
-        $this->schema  = new Schema($this->resolveOfConstraints($schemaData));
-        $this->options = $options;
-        $this->request = $request;
+        $schemaData   = json_decode(json_encode($schema->getSerializableData()), true);
+        $this->schema = new Schema($this->resolveOfConstraints($schemaData));
     }
 
-    /**
-     * @return array<mixed>|string|bool|int|float
-     */
+    /** @return array<mixed>|string|bool|int|float */
     public function generate(): array|string|bool|int|float
     {
         if ($this->schema->type === 'array') {
diff --git a/src/SchemaFaker/StringFaker.php b/src/SchemaFaker/StringFaker.php
index 5c4be6d..c07e3f7 100644
--- a/src/SchemaFaker/StringFaker.php
+++ b/src/SchemaFaker/StringFaker.php
@@ -18,9 +18,7 @@
 
 use const DATE_RFC3339;
 
-/**
- * @internal
- */
+/** @internal */
 final class StringFaker
 {
     public static function generate(Schema $schema): string
diff --git a/tests/Integration/E2ETest.php b/tests/Integration/E2ETest.php
index ac9f571..810f286 100644
--- a/tests/Integration/E2ETest.php
+++ b/tests/Integration/E2ETest.php
@@ -16,9 +16,7 @@
 use function Safe\file_get_contents;
 use function Safe\sprintf;
 
-/**
- * @group Integration
- */
+/** @group Integration */
 class E2ETest extends TestCase
 {
     /**
@@ -138,9 +136,7 @@ function it_can_generate_valid_component(string $filename)
         self::assertTrue(true);
     }
 
-    /**
-     * @return string[][]
-     */
+    /** @return string[][] */
     public function specProvider(): array
     {
         return [
diff --git a/tests/Integration/OpenAPIFakerTest.php b/tests/Integration/OpenAPIFakerTest.php
index 8d81a5a..9cb6c5b 100644
--- a/tests/Integration/OpenAPIFakerTest.php
+++ b/tests/Integration/OpenAPIFakerTest.php
@@ -344,7 +344,7 @@ function it_can_mock_a_specific_schema()
     function it_will_mock_the_response()
     {
         $yamlSpec =
-            <<<YAML
+            <<<'YAML'
 openapi: 3.0.2
 paths:
   /todos:
@@ -355,7 +355,7 @@ function it_will_mock_the_response()
           content:
             'application/json':
               schema:
-                \$ref: "#/components/schemas/Todos"
+                $ref: "#/components/schemas/Todos"
 components:
   schemas:
     Todo:
@@ -374,7 +374,7 @@ function it_will_mock_the_response()
     Todos:
       type: array
       items:
-        \$ref: "#/components/schemas/Todo"
+        $ref: "#/components/schemas/Todo"
 YAML;
 
         $fakeData = OpenAPIFaker::createFromYaml($yamlSpec)->mockResponse('/todos', 'GET');
@@ -451,7 +451,7 @@ function it_will_throw_exception_if_schema_does_not_exist()
      */
     function it_can_set_options()
     {
-        $specYaml = <<<YAML
+        $specYaml = <<<'YAML'
 openapi: 3.0.2
 components:
   schemas:
diff --git a/tests/Unit/SchemaFaker/ArrayFakerTest.php b/tests/Unit/SchemaFaker/ArrayFakerTest.php
index 9329a67..4b300a7 100644
--- a/tests/Unit/SchemaFaker/ArrayFakerTest.php
+++ b/tests/Unit/SchemaFaker/ArrayFakerTest.php
@@ -39,13 +39,13 @@ public function setUp(): void
     function it_can_generate_items()
     {
         $fakeData = ArrayFaker::generate(SchemaFactory::fromJson(
-            <<<JSON
+            <<<'JSON'
 {
   "items": {
     "type": "string"
   }
 }
-JSON
+JSON,
         ), $this->options);
 
         $this->assertMatchesJsonSnapshot($fakeData);
@@ -55,7 +55,7 @@ function it_can_generate_items()
     function it_can_handle_min_items()
     {
         $fakeData = ArrayFaker::generate(SchemaFactory::fromJson(
-            <<< JSON
+            <<<'JSON'
 {
   "type": "array",
   "items": {
@@ -63,7 +63,7 @@ function it_can_handle_min_items()
   },
   "minItems": 3
 }
-JSON
+JSON,
         ), $this->options);
 
         $this->assertMatchesJsonSnapshot($fakeData);
@@ -73,7 +73,7 @@ function it_can_handle_min_items()
     function it_can_handle_max_items()
     {
         $fakeData = ArrayFaker::generate(SchemaFactory::fromJson(
-            <<< JSON
+            <<<'JSON'
 {
   "type": "array",
   "items": {
@@ -81,7 +81,7 @@ function it_can_handle_max_items()
   },
   "maxItems": 10
 }
-JSON
+JSON,
         ), $this->options);
 
         $this->assertMatchesJsonSnapshot($fakeData);
@@ -91,7 +91,7 @@ function it_can_handle_max_items()
     function it_can_handle_both_min_and_max_items()
     {
         $fakeData = ArrayFaker::generate(SchemaFactory::fromJson(
-            <<< JSON
+            <<<'JSON'
 {
   "type": "array",
   "items": {
@@ -100,7 +100,7 @@ function it_can_handle_both_min_and_max_items()
   "minItems": 8,
   "maxItems": 10
 }
-JSON
+JSON,
         ), $this->options);
 
         $this->assertMatchesJsonSnapshot($fakeData);
@@ -110,14 +110,14 @@ function it_can_handle_both_min_and_max_items()
     function it_will_use_minimum_plus_15_as_max_items_if_its_not_given()
     {
         $fakeData = ArrayFaker::generate(SchemaFactory::fromJson(
-            <<< JSON
+            <<<'JSON'
 {
   "type": "array",
   "items": {
     "type": "string"
   }
 }
-JSON
+JSON,
         ), $this->options);
 
         $this->assertMatchesJsonSnapshot($fakeData);
@@ -126,7 +126,7 @@ function it_will_use_minimum_plus_15_as_max_items_if_its_not_given()
     /** @test */
     function it_handles_nested_arrays()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: array
 items:
   type: array
@@ -145,7 +145,7 @@ function it_can_generate_unique_elements()
         mt_srand(227, MT_RAND_PHP);
 
         $fakeData = ArrayFaker::generate(SchemaFactory::fromJson(
-            <<< JSON
+            <<<'JSON'
 {
   "type": "array",
   "items": {
@@ -157,7 +157,7 @@ function it_can_generate_unique_elements()
   "maxItems": 5,
   "uniqueItems": true
 }
-JSON
+JSON,
         ), $this->options);
 
         self::assertIsArray($fakeData);
@@ -169,7 +169,7 @@ function it_can_generate_unique_elements()
     function it_can_generate_elements_from_enum()
     {
         $fakeData = ArrayFaker::generate(SchemaFactory::fromYaml(
-            <<<YAML
+            <<<'YAML'
 type: array
 items:
     type: integer
@@ -178,7 +178,7 @@ enum:
       - 88
       - 6789
 minItems: 10
-YAML
+YAML,
         ), $this->options);
 
         $this->assertMatchesJsonSnapshot($fakeData);
@@ -194,12 +194,12 @@ function it_can_override_minimum_items_with_option()
         $options = (new Options())->setMinItems(5);
 
         $fakeData = ArrayFaker::generate(SchemaFactory::fromYaml(
-            <<<YAML
+            <<<'YAML'
 type: array
 items:
     type: integer
 minItems: 3
-YAML
+YAML,
         ), $options);
 
         self::assertGreaterThan(5, count($fakeData));
@@ -212,13 +212,13 @@ function it_will_not_override_minimum_items_with_option_if_option_is_smaller()
         $options = (new Options())->setMinItems(1);
 
         $fakeData = ArrayFaker::generate(SchemaFactory::fromYaml(
-            <<<YAML
+            <<<'YAML'
 type: array
 items:
     type: integer
 minItems: 3
 maxItems: 3
-YAML
+YAML,
         ), $options);
 
         self::assertCount(3, $fakeData);
@@ -231,12 +231,12 @@ function it_can_override_maximum_items_with_option()
         $options = (new Options())->setMaxItems(3);
 
         $fakeData = ArrayFaker::generate(SchemaFactory::fromYaml(
-            <<<YAML
+            <<<'YAML'
 type: array
 items:
     type: integer
 maxItems: 4
-YAML
+YAML,
         ), $options);
 
         self::assertLessThanOrEqual(3, count($fakeData));
@@ -249,13 +249,13 @@ function it_will_not_override_maximum_items_with_option_if_option_is_greater()
         $options = (new Options())->setMaxItems(5);
 
         $fakeData = ArrayFaker::generate(SchemaFactory::fromYaml(
-            <<<YAML
+            <<<'YAML'
 type: array
 items:
     type: integer
 minItems: 3
 maxItems: 3
-YAML
+YAML,
         ), $options);
 
         self::assertCount(3, $fakeData);
@@ -268,13 +268,13 @@ function it_can_override_both_minimum_and_maximum_items_with_options()
         $options = (new Options())->setMinItems(3)->setMaxItems(3);
 
         $fakeData = ArrayFaker::generate(SchemaFactory::fromYaml(
-            <<<YAML
+            <<<'YAML'
 type: array
 items:
     type: integer
 minItems: 1
 maxItems: 4
-YAML
+YAML,
         ), $options);
 
         self::assertCount(3, $fakeData);
@@ -287,12 +287,12 @@ function it_can_override_minimum_if_its_greater_than_maximum()
         $options = (new Options())->setMaxItems(4);
 
         $fakeData = ArrayFaker::generate(SchemaFactory::fromYaml(
-            <<<YAML
+            <<<'YAML'
 type: array
 items:
     type: integer
 minItems: 5
-YAML
+YAML,
         ), $options);
 
         self::assertCount(4, $fakeData);
diff --git a/tests/Unit/SchemaFaker/BooleanFakerTest.php b/tests/Unit/SchemaFaker/BooleanFakerTest.php
index 0fb1ef2..d972d7c 100644
--- a/tests/Unit/SchemaFaker/BooleanFakerTest.php
+++ b/tests/Unit/SchemaFaker/BooleanFakerTest.php
@@ -8,15 +8,13 @@
 use Vural\OpenAPIFaker\Tests\SchemaFactory;
 use Vural\OpenAPIFaker\Tests\Unit\UnitTestCase;
 
-/**
- * @covers \Vural\OpenAPIFaker\SchemaFaker\BooleanFaker
- */
+/** @covers \Vural\OpenAPIFaker\SchemaFaker\BooleanFaker */
 class BooleanFakerTest extends UnitTestCase
 {
     /** @test */
     function it_can_generate_boolean_value()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: boolean
 YAML;
 
@@ -28,7 +26,7 @@ function it_can_generate_boolean_value()
     /** @test */
     function it_can_generate_boolean_value_from_enum()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: boolean
 enum:
   - true
diff --git a/tests/Unit/SchemaFaker/NumberFakerTest.php b/tests/Unit/SchemaFaker/NumberFakerTest.php
index 59848c2..49df4b9 100644
--- a/tests/Unit/SchemaFaker/NumberFakerTest.php
+++ b/tests/Unit/SchemaFaker/NumberFakerTest.php
@@ -8,15 +8,13 @@
 use Vural\OpenAPIFaker\Tests\SchemaFactory;
 use Vural\OpenAPIFaker\Tests\Unit\UnitTestCase;
 
-/**
- * @covers \Vural\OpenAPIFaker\SchemaFaker\NumberFaker
- */
+/** @covers \Vural\OpenAPIFaker\SchemaFaker\NumberFaker */
 class NumberFakerTest extends UnitTestCase
 {
     /** @test */
     function it_can_generate_a_number()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: number
 YAML;
 
@@ -29,7 +27,7 @@ function it_can_generate_a_number()
     /** @test */
     function it_can_handle_number_float_format()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: number
 format: float
 YAML;
@@ -43,7 +41,7 @@ function it_can_handle_number_float_format()
     /** @test */
     function it_can_handle_number_double_format()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: number
 format: double
 YAML;
@@ -57,7 +55,7 @@ function it_can_handle_number_double_format()
     /** @test */
     function it_can_generate_a_integer()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: integer
 YAML;
 
@@ -70,7 +68,7 @@ function it_can_generate_a_integer()
     /** @test */
     function it_can_handle_integer_int32_format()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: integer
 format: int32
 YAML;
@@ -84,7 +82,7 @@ function it_can_handle_integer_int32_format()
     /** @test */
     function it_can_handle_integer_int64_format()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: integer
 format: int64
 YAML;
@@ -98,7 +96,7 @@ function it_can_handle_integer_int64_format()
     /** @test */
     function it_can_handle_minimum_keyword()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: integer
 minimum: 100
 YAML;
@@ -113,7 +111,7 @@ function it_can_handle_minimum_keyword()
     /** @test */
     function it_can_handle_maximum_keyword()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: integer
 maximum: 100
 YAML;
@@ -128,7 +126,7 @@ function it_can_handle_maximum_keyword()
     /** @test */
     function it_can_handle_both_minimum_and_maximum_keyword()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: number
 minimum: 100
 maximum: 200
@@ -143,7 +141,7 @@ function it_can_handle_both_minimum_and_maximum_keyword()
     /** @test */
     function it_can_handle_exclusive_minimum_keyword()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: integer
 minimum: 100
 maximum: 102
@@ -160,7 +158,7 @@ function it_can_handle_exclusive_minimum_keyword()
     /** @test */
     function it_can_handle_exclusive_maximum_keyword()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: integer
 minimum: 100
 maximum: 102
@@ -177,7 +175,7 @@ function it_can_handle_exclusive_maximum_keyword()
     /** @test */
     function it_can_handle_both_exclusive_minimum_and_exclusive_maximum_keyword()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: integer
 minimum: 100
 maximum: 102
@@ -195,7 +193,7 @@ function it_can_handle_both_exclusive_minimum_and_exclusive_maximum_keyword()
     /** @test */
     function it_can_handle_multiple_of_keyword()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: integer
 multipleOf: 10
 YAML;
@@ -209,7 +207,7 @@ function it_can_handle_multiple_of_keyword()
     /** @test */
     function it_can_handle_multiple_of_keyword_with_float_number()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: number
 multipleOf: 8
 YAML;
@@ -223,7 +221,7 @@ function it_can_handle_multiple_of_keyword_with_float_number()
     /** @test */
     function it_can_generate_elements_from_enum()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: number
 enum:
   - 1010.9865
diff --git a/tests/Unit/SchemaFaker/ObjectFakerTest.php b/tests/Unit/SchemaFaker/ObjectFakerTest.php
index 1d1f3c2..d523762 100644
--- a/tests/Unit/SchemaFaker/ObjectFakerTest.php
+++ b/tests/Unit/SchemaFaker/ObjectFakerTest.php
@@ -31,7 +31,7 @@ public function setUp(): void
     /** @test */
     function it_can_generate_simple_object()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: object
 properties:
   id:
@@ -48,7 +48,7 @@ function it_can_generate_simple_object()
     /** @test */
     function it_can_generate_nested_objects()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: object
 properties:
     id:
@@ -73,7 +73,7 @@ function it_can_generate_nested_objects()
     /** @test */
     function it_includes_required_properties_all_the_time()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: object
 properties:
   id:
@@ -107,7 +107,7 @@ function it_can_fake_all_properties_if_always_fake_optionals_option_is_set()
     {
         $options = (new Options())->setAlwaysFakeOptionals(true);
 
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: object
 properties:
   id:
@@ -139,7 +139,7 @@ function it_can_fake_all_properties_if_always_fake_optionals_option_is_set()
     /** @test */
     function it_does_not_inlcude_readonly_properties_when_type_is_request()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: object
 properties:
   id:
@@ -169,7 +169,7 @@ function it_does_not_inlcude_readonly_properties_when_type_is_request()
     /** @test */
     function it_does_not_inlcude_writeonly_properties_when_type_is_response()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: object
 properties:
   id:
diff --git a/tests/Unit/SchemaFaker/SchemaFakerTest.php b/tests/Unit/SchemaFaker/SchemaFakerTest.php
index 0ab650e..60bd485 100644
--- a/tests/Unit/SchemaFaker/SchemaFakerTest.php
+++ b/tests/Unit/SchemaFaker/SchemaFakerTest.php
@@ -35,7 +35,7 @@ public function setUp(): void
     /** @test */
     function it_can_choose_one_schema_from_one_of()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 oneOf:
   -
     type: string
@@ -54,7 +54,7 @@ function it_can_choose_one_schema_from_one_of()
     /** @test */
     function it_can_merge_schemas_from_all_of()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 allOf:
   -
     type: object
@@ -85,7 +85,7 @@ function it_can_merge_schemas_from_all_of()
     /** @test */
     function it_will_merge_all_of_with_existing_schema()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 allOf:
   -
     type: object
@@ -110,7 +110,7 @@ function it_will_merge_all_of_with_existing_schema()
     /** @test */
     function it_will_merge_one_of_with_existing_schema()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 oneOf:
   -
     type: object
@@ -141,7 +141,7 @@ function it_will_merge_one_of_with_existing_schema()
     /** @test */
     function it_can_recursively_merge_of_constraints()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 oneOf:
   -
     oneOf:
diff --git a/tests/Unit/SchemaFaker/StringFakerTest.php b/tests/Unit/SchemaFaker/StringFakerTest.php
index 1df46c3..368d6bd 100644
--- a/tests/Unit/SchemaFaker/StringFakerTest.php
+++ b/tests/Unit/SchemaFaker/StringFakerTest.php
@@ -15,15 +15,13 @@
 
 use const FILTER_VALIDATE_URL;
 
-/**
- * @covers \Vural\OpenAPIFaker\SchemaFaker\StringFaker
- */
+/** @covers \Vural\OpenAPIFaker\SchemaFaker\StringFaker */
 class StringFakerTest extends UnitTestCase
 {
     /** @test */
     function it_can_generate_single_string()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: string
 YAML;
 
@@ -36,7 +34,7 @@ function it_can_generate_single_string()
     /** @test */
     function it_can_handle_min_length()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: string
 minLength: 3
 YAML;
@@ -50,7 +48,7 @@ function it_can_handle_min_length()
     /** @test */
     function it_can_handle_max_length()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: string
 maxLength: 10
 YAML;
@@ -64,7 +62,7 @@ function it_can_handle_max_length()
     /** @test */
     function it_can_handle_date_format()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: string
 format: date
 YAML;
@@ -81,7 +79,7 @@ function it_can_handle_date_format()
     /** @test */
     function it_can_handle_datetime_format()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: string
 format: date-time
 YAML;
@@ -98,7 +96,7 @@ function it_can_handle_datetime_format()
     /** @test */
     function it_can_handle_email_format()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: string
 format: email
 YAML;
@@ -113,7 +111,7 @@ function it_can_handle_email_format()
     /** @test */
     function it_can_handle_uuid_format()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: string
 format: uuid
 YAML;
@@ -128,7 +126,7 @@ function it_can_handle_uuid_format()
     /** @test */
     function it_can_handle_uri_format()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: string
 format: uri
 YAML;
@@ -143,7 +141,7 @@ function it_can_handle_uri_format()
     /** @test */
     function it_can_handle_hostname_format()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: string
 format: hostname
 YAML;
@@ -158,7 +156,7 @@ function it_can_handle_hostname_format()
     /** @test */
     function it_can_handle_ipv4_format()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: string
 format: ipv4
 YAML;
@@ -173,7 +171,7 @@ function it_can_handle_ipv4_format()
     /** @test */
     function it_can_handle_ipv6_format()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: string
 format: ipv6
 YAML;
@@ -203,7 +201,7 @@ function it_can_handle_patterns()
     /** @test */
     function it_will_return_a_string_if_unknown_format_is_given()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: string
 format: unkown
 YAML;
@@ -217,7 +215,7 @@ function it_will_return_a_string_if_unknown_format_is_given()
     /** @test */
     function it_can_generate_elements_from_enum()
     {
-        $yaml = <<<YAML
+        $yaml = <<<'YAML'
 type: string
 enum:
   - foo