diff --git a/composer.json b/composer.json
index b77cc093cc7..07fe258d918 100644
--- a/composer.json
+++ b/composer.json
@@ -88,7 +88,7 @@
         "symfony/yaml": "^3.4 || ^4.0 || ^5.0",
         "teohhanhui/stubs-mongodb": "@dev",
         "twig/twig": "^1.42.3 || ^2.12",
-        "webonyx/graphql-php": ">=0.13.1 <1.0"
+        "webonyx/graphql-php": "^14.0"
     },
     "conflict": {
         "doctrine/common": "<2.7",
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 71bcca5310e..0ee1f7d1868 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -38,9 +38,6 @@ parameters:
 		-
 			message: '#Variable \$positionPm might not be defined\.#'
 			path: src/Util/ClassInfoTrait.php
-		-
-			message: "#Cannot access offset 'node' on bool\\.#"
-			path: src/GraphQl/Serializer/SerializerContextBuilder.php
 		- '#Access to an undefined property Prophecy\\Prophecy\\ObjectProphecy<(\\?[a-zA-Z0-9_]+)+>::\$[a-zA-Z0-9_]+#'
 		-
 			message: '#Call to an undefined method Doctrine\\Persistence\\ObjectManager::getConnection\(\)#'
diff --git a/src/GraphQl/Action/EntrypointAction.php b/src/GraphQl/Action/EntrypointAction.php
index 18326878a14..7254f667f00 100644
--- a/src/GraphQl/Action/EntrypointAction.php
+++ b/src/GraphQl/Action/EntrypointAction.php
@@ -16,6 +16,7 @@
 use ApiPlatform\Core\GraphQl\ExecutorInterface;
 use ApiPlatform\Core\GraphQl\Type\SchemaBuilderInterface;
 use GraphQL\Error\Debug;
+use GraphQL\Error\DebugFlag;
 use GraphQL\Error\Error;
 use GraphQL\Error\UserError;
 use GraphQL\Executor\ExecutionResult;
@@ -46,7 +47,11 @@ public function __construct(SchemaBuilderInterface $schemaBuilder, ExecutorInter
         $this->executor = $executor;
         $this->graphiQlAction = $graphiQlAction;
         $this->graphQlPlaygroundAction = $graphQlPlaygroundAction;
-        $this->debug = $debug ? Debug::INCLUDE_DEBUG_MESSAGE | Debug::INCLUDE_TRACE : false;
+        if (class_exists(Debug::class)) {
+            $this->debug = $debug ? Debug::INCLUDE_DEBUG_MESSAGE | Debug::INCLUDE_TRACE : false;
+        } else {
+            $this->debug = $debug ? DebugFlag::INCLUDE_DEBUG_MESSAGE | DebugFlag::INCLUDE_TRACE : DebugFlag::NONE;
+        }
         $this->graphiqlEnabled = $graphiqlEnabled;
         $this->graphQlPlaygroundEnabled = $graphQlPlaygroundEnabled;
         $this->defaultIde = $defaultIde;
@@ -210,7 +215,7 @@ private function decodeVariables(string $variables): array
 
     private function buildExceptionResponse(\Exception $e, int $statusCode): JsonResponse
     {
-        $executionResult = new ExecutionResult(null, [new Error($e->getMessage(), null, null, null, null, $e)]);
+        $executionResult = new ExecutionResult(null, [new Error($e->getMessage(), null, null, [], null, $e)]);
 
         return new JsonResponse($executionResult->toArray($this->debug), $statusCode);
     }
diff --git a/src/GraphQl/Type/Definition/IterableType.php b/src/GraphQl/Type/Definition/IterableType.php
index dd1be487a0d..bf488c58667 100644
--- a/src/GraphQl/Type/Definition/IterableType.php
+++ b/src/GraphQl/Type/Definition/IterableType.php
@@ -18,6 +18,8 @@
 use GraphQL\Language\AST\FloatValueNode;
 use GraphQL\Language\AST\IntValueNode;
 use GraphQL\Language\AST\ListValueNode;
+use GraphQL\Language\AST\Node;
+use GraphQL\Language\AST\NullValueNode;
 use GraphQL\Language\AST\ObjectValueNode;
 use GraphQL\Language\AST\StringValueNode;
 use GraphQL\Language\AST\ValueNode;
@@ -72,8 +74,10 @@ public function parseValue($value)
 
     /**
      * {@inheritdoc}
+     *
+     * @param ObjectValueNode|ListValueNode|IntValueNode|FloatValueNode|StringValueNode|BooleanValueNode|NullValueNode $valueNode
      */
-    public function parseLiteral($valueNode, array $variables = null)
+    public function parseLiteral(Node $valueNode, ?array $variables = null)
     {
         if ($valueNode instanceof ObjectValueNode || $valueNode instanceof ListValueNode) {
             return $this->parseIterableLiteral($valueNode);
diff --git a/src/GraphQl/Type/Definition/TypeInterface.php b/src/GraphQl/Type/Definition/TypeInterface.php
index fc4ff950306..b974f05a50d 100644
--- a/src/GraphQl/Type/Definition/TypeInterface.php
+++ b/src/GraphQl/Type/Definition/TypeInterface.php
@@ -13,14 +13,12 @@
 
 namespace ApiPlatform\Core\GraphQl\Type\Definition;
 
-use GraphQL\Type\Definition\LeafType;
-
 /**
  * @experimental
  *
  * @author Alan Poulain <contact@alanpoulain.eu>
  */
-interface TypeInterface extends LeafType
+interface TypeInterface
 {
     public function getName(): string;
 }
diff --git a/src/GraphQl/Type/Definition/UploadType.php b/src/GraphQl/Type/Definition/UploadType.php
index e0b2a76b9eb..36f3b715653 100644
--- a/src/GraphQl/Type/Definition/UploadType.php
+++ b/src/GraphQl/Type/Definition/UploadType.php
@@ -14,6 +14,7 @@
 namespace ApiPlatform\Core\GraphQl\Type\Definition;
 
 use GraphQL\Error\Error;
+use GraphQL\Language\AST\Node;
 use GraphQL\Type\Definition\ScalarType;
 use GraphQL\Utils\Utils;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
@@ -61,7 +62,7 @@ public function parseValue($value): UploadedFile
     /**
      * {@inheritdoc}
      */
-    public function parseLiteral($valueNode, array $variables = null)
+    public function parseLiteral(Node $valueNode, array $variables = null)
     {
         throw new Error('`Upload` cannot be hardcoded in query, be sure to conform to GraphQL multipart request specification.', $valueNode);
     }
diff --git a/src/GraphQl/Type/FieldsBuilder.php b/src/GraphQl/Type/FieldsBuilder.php
index 237f1746e5c..cd3108700a8 100644
--- a/src/GraphQl/Type/FieldsBuilder.php
+++ b/src/GraphQl/Type/FieldsBuilder.php
@@ -93,7 +93,7 @@ public function getItemQueryFields(string $resourceClass, ResourceMetadata $reso
         $shortName = $resourceMetadata->getShortName();
         $fieldName = lcfirst('item_query' === $queryName ? $shortName : $queryName.$shortName);
 
-        $deprecationReason = (string) $resourceMetadata->getGraphqlAttribute($queryName, 'deprecation_reason', '', true);
+        $deprecationReason = $resourceMetadata->getGraphqlAttribute($queryName, 'deprecation_reason', null, true);
 
         if ($fieldConfiguration = $this->getResourceFieldConfiguration(null, null, $deprecationReason, new Type(Type::BUILTIN_TYPE_OBJECT, true, $resourceClass), $resourceClass, false, $queryName, null)) {
             $args = $this->resolveResourceArgs($configuration['args'] ?? [], $queryName, $shortName);
@@ -113,7 +113,7 @@ public function getCollectionQueryFields(string $resourceClass, ResourceMetadata
         $shortName = $resourceMetadata->getShortName();
         $fieldName = lcfirst('collection_query' === $queryName ? $shortName : $queryName.$shortName);
 
-        $deprecationReason = (string) $resourceMetadata->getGraphqlAttribute($queryName, 'deprecation_reason', '', true);
+        $deprecationReason = $resourceMetadata->getGraphqlAttribute($queryName, 'deprecation_reason', null, true);
 
         if ($fieldConfiguration = $this->getResourceFieldConfiguration(null, null, $deprecationReason, new Type(Type::BUILTIN_TYPE_OBJECT, false, null, true, null, new Type(Type::BUILTIN_TYPE_OBJECT, false, $resourceClass)), $resourceClass, false, $queryName, null)) {
             $args = $this->resolveResourceArgs($configuration['args'] ?? [], $queryName, $shortName);
@@ -133,7 +133,7 @@ public function getMutationFields(string $resourceClass, ResourceMetadata $resou
         $mutationFields = [];
         $shortName = $resourceMetadata->getShortName();
         $resourceType = new Type(Type::BUILTIN_TYPE_OBJECT, true, $resourceClass);
-        $deprecationReason = $resourceMetadata->getGraphqlAttribute($mutationName, 'deprecation_reason', '', true);
+        $deprecationReason = $resourceMetadata->getGraphqlAttribute($mutationName, 'deprecation_reason', null, true);
 
         if ($fieldConfiguration = $this->getResourceFieldConfiguration(null, ucfirst("{$mutationName}s a $shortName."), $deprecationReason, $resourceType, $resourceClass, false, null, $mutationName)) {
             $fieldConfiguration['args'] += ['input' => $this->getResourceFieldConfiguration(null, null, $deprecationReason, $resourceType, $resourceClass, true, null, $mutationName)];
@@ -194,7 +194,7 @@ public function getResourceObjectTypeFields(?string $resourceClass, ResourceMeta
                     continue;
                 }
 
-                if ($fieldConfiguration = $this->getResourceFieldConfiguration($property, $propertyMetadata->getDescription(), $propertyMetadata->getAttribute('deprecation_reason', ''), $propertyType, $resourceClass, $input, $queryName, $mutationName, $depth)) {
+                if ($fieldConfiguration = $this->getResourceFieldConfiguration($property, $propertyMetadata->getDescription(), $propertyMetadata->getAttribute('deprecation_reason', null), $propertyType, $resourceClass, $input, $queryName, $mutationName, $depth)) {
                     $fields['id' === $property ? '_id' : $this->normalizePropertyName($property)] = $fieldConfiguration;
                 }
             }
@@ -228,7 +228,7 @@ public function resolveResourceArgs(array $args, string $operationName, string $
      *
      * @see http://webonyx.github.io/graphql-php/type-system/object-types/
      */
-    private function getResourceFieldConfiguration(?string $property, ?string $fieldDescription, string $deprecationReason, Type $type, string $rootResource, bool $input, ?string $queryName, ?string $mutationName, int $depth = 0): ?array
+    private function getResourceFieldConfiguration(?string $property, ?string $fieldDescription, ?string $deprecationReason, Type $type, string $rootResource, bool $input, ?string $queryName, ?string $mutationName, int $depth = 0): ?array
     {
         try {
             $resourceClass = $this->typeBuilder->isCollection($type) && ($collectionValueType = $type->getCollectionValueType()) ? $collectionValueType->getClassName() : $type->getClassName();
diff --git a/tests/Fixtures/TestBundle/GraphQl/Type/Definition/DateTimeType.php b/tests/Fixtures/TestBundle/GraphQl/Type/Definition/DateTimeType.php
index f103ec3f798..d6b64b656c8 100644
--- a/tests/Fixtures/TestBundle/GraphQl/Type/Definition/DateTimeType.php
+++ b/tests/Fixtures/TestBundle/GraphQl/Type/Definition/DateTimeType.php
@@ -15,6 +15,7 @@
 
 use ApiPlatform\Core\GraphQl\Type\Definition\TypeInterface;
 use GraphQL\Error\Error;
+use GraphQL\Language\AST\Node;
 use GraphQL\Language\AST\StringValueNode;
 use GraphQL\Type\Definition\ScalarType;
 use GraphQL\Utils\Utils;
@@ -77,7 +78,7 @@ public function parseValue($value)
     /**
      * {@inheritdoc}
      */
-    public function parseLiteral($valueNode, ?array $variables = null)
+    public function parseLiteral(Node $valueNode, ?array $variables = null)
     {
         if ($valueNode instanceof StringValueNode && false !== \DateTime::createFromFormat(\DateTime::ATOM, $valueNode->value)) {
             return $valueNode->value;
diff --git a/tests/GraphQl/Action/EntrypointActionTest.php b/tests/GraphQl/Action/EntrypointActionTest.php
index 74ffd74aad0..a0e16a5020e 100644
--- a/tests/GraphQl/Action/EntrypointActionTest.php
+++ b/tests/GraphQl/Action/EntrypointActionTest.php
@@ -18,6 +18,7 @@
 use ApiPlatform\Core\GraphQl\Action\GraphQlPlaygroundAction;
 use ApiPlatform\Core\GraphQl\ExecutorInterface;
 use ApiPlatform\Core\GraphQl\Type\SchemaBuilderInterface;
+use GraphQL\Error\DebugFlag;
 use GraphQL\Executor\ExecutionResult;
 use GraphQL\Type\Schema;
 use PHPUnit\Framework\TestCase;
@@ -229,7 +230,7 @@ private function getEntrypointAction(array $variables = ['graphqlVariable']): En
         $schemaBuilderProphecy->getSchema()->willReturn($schema->reveal());
 
         $executionResultProphecy = $this->prophesize(ExecutionResult::class);
-        $executionResultProphecy->toArray(false)->willReturn(['GraphQL']);
+        $executionResultProphecy->toArray(DebugFlag::NONE)->willReturn(['GraphQL']);
         $executorProphecy = $this->prophesize(ExecutorInterface::class);
         $executorProphecy->executeQuery(Argument::is($schema->reveal()), 'graphqlQuery', null, null, $variables, 'graphqlOperationName')->willReturn($executionResultProphecy->reveal());
 
diff --git a/tests/GraphQl/Resolver/ResourceFieldResolverTest.php b/tests/GraphQl/Resolver/ResourceFieldResolverTest.php
index 12e648a5210..33e0799efdb 100644
--- a/tests/GraphQl/Resolver/ResourceFieldResolverTest.php
+++ b/tests/GraphQl/Resolver/ResourceFieldResolverTest.php
@@ -17,6 +17,7 @@
 use ApiPlatform\Core\GraphQl\Resolver\ResourceFieldResolver;
 use ApiPlatform\Core\GraphQl\Serializer\ItemNormalizer;
 use ApiPlatform\Core\Tests\Fixtures\TestBundle\Entity\Dummy;
+use GraphQL\Type\Definition\FieldDefinition;
 use GraphQL\Type\Definition\ObjectType;
 use GraphQL\Type\Definition\ResolveInfo;
 use GraphQL\Type\Schema;
@@ -29,7 +30,7 @@ public function testId()
         $iriConverterProphecy = $this->prophesize(IriConverterInterface::class);
         $iriConverterProphecy->getItemIriFromResourceClass(Dummy::class, ['id' => 1])->willReturn('/dummies/1')->shouldBeCalled();
 
-        $resolveInfo = new ResolveInfo('id', [], new ObjectType(['name' => '']), new ObjectType(['name' => '']), [], new Schema([]), [], null, null, []);
+        $resolveInfo = new ResolveInfo(FieldDefinition::create(['name' => 'id', 'type' => new ObjectType(['name' => ''])]), [], new ObjectType(['name' => '']), [], new Schema([]), [], null, null, []);
 
         $resolver = new ResourceFieldResolver($iriConverterProphecy->reveal());
         $this->assertEquals('/dummies/1', $resolver([ItemNormalizer::ITEM_RESOURCE_CLASS_KEY => Dummy::class, ItemNormalizer::ITEM_IDENTIFIERS_KEY => ['id' => 1]], [], [], $resolveInfo));
@@ -39,7 +40,7 @@ public function testOriginalId()
     {
         $iriConverterProphecy = $this->prophesize(IriConverterInterface::class);
 
-        $resolveInfo = new ResolveInfo('_id', [], new ObjectType(['name' => '']), new ObjectType(['name' => '']), [], new Schema([]), [], null, null, []);
+        $resolveInfo = new ResolveInfo(FieldDefinition::create(['name' => '_id', 'type' => new ObjectType(['name' => ''])]), [], new ObjectType(['name' => '']), [], new Schema([]), [], null, null, []);
 
         $resolver = new ResourceFieldResolver($iriConverterProphecy->reveal());
         $this->assertEquals(1, $resolver(['id' => 1], [], [], $resolveInfo));
@@ -49,7 +50,7 @@ public function testDirectAccess()
     {
         $iriConverterProphecy = $this->prophesize(IriConverterInterface::class);
 
-        $resolveInfo = new ResolveInfo('foo', [], new ObjectType(['name' => '']), new ObjectType(['name' => '']), [], new Schema([]), [], null, null, []);
+        $resolveInfo = new ResolveInfo(FieldDefinition::create(['name' => 'foo', 'type' => new ObjectType(['name' => ''])]), [], new ObjectType(['name' => '']), [], new Schema([]), [], null, null, []);
 
         $resolver = new ResourceFieldResolver($iriConverterProphecy->reveal());
         $this->assertEquals('bar', $resolver(['foo' => 'bar'], [], [], $resolveInfo));
@@ -61,7 +62,7 @@ public function testNonResource()
         $iriConverterProphecy = $this->prophesize(IriConverterInterface::class);
         $iriConverterProphecy->getIriFromItem($dummy)->willReturn('/dummies/1')->shouldNotBeCalled();
 
-        $resolveInfo = new ResolveInfo('id', [], new ObjectType(['name' => '']), new ObjectType(['name' => '']), [], new Schema([]), [], null, null, []);
+        $resolveInfo = new ResolveInfo(FieldDefinition::create(['name' => 'id', 'type' => new ObjectType(['name' => ''])]), [], new ObjectType(['name' => '']), [], new Schema([]), [], null, null, []);
 
         $resolver = new ResourceFieldResolver($iriConverterProphecy->reveal());
         $this->assertNull($resolver([], [], [], $resolveInfo));
diff --git a/tests/GraphQl/Type/FieldsBuilderTest.php b/tests/GraphQl/Type/FieldsBuilderTest.php
index 014113d45ed..eaac3a037df 100644
--- a/tests/GraphQl/Type/FieldsBuilderTest.php
+++ b/tests/GraphQl/Type/FieldsBuilderTest.php
@@ -162,7 +162,7 @@ public function itemQueryFieldsProvider(): array
                             'id' => ['type' => GraphQLType::nonNull(GraphQLType::id())],
                         ],
                         'resolve' => $resolver,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                     ],
                 ],
             ],
@@ -174,7 +174,7 @@ public function itemQueryFieldsProvider(): array
                         'description' => null,
                         'args' => [],
                         'resolve' => null,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                         'name' => 'customActionName',
                     ],
                 ],
@@ -191,7 +191,7 @@ public function itemQueryFieldsProvider(): array
                             ],
                         ],
                         'resolve' => null,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                     ],
                 ],
             ],
@@ -290,7 +290,7 @@ public function collectionQueryFieldsProvider(): array
                             'dateField' => new InputObjectType(['name' => 'ShortNameFilter_dateField', 'fields' => ['before' => $graphqlType]]),
                         ],
                         'resolve' => $resolver,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                     ],
                 ],
             ],
@@ -303,7 +303,7 @@ public function collectionQueryFieldsProvider(): array
                         'description' => null,
                         'args' => [],
                         'resolve' => $resolver,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                         'name' => 'customActionName',
                     ],
                 ],
@@ -321,7 +321,7 @@ public function collectionQueryFieldsProvider(): array
                             ],
                         ],
                         'resolve' => $resolver,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                     ],
                 ],
             ],
@@ -381,11 +381,11 @@ public function mutationFieldsProvider(): array
                                 'description' => null,
                                 'args' => [],
                                 'resolve' => null,
-                                'deprecationReason' => '',
+                                'deprecationReason' => null,
                             ],
                         ],
                         'resolve' => $collectionResolver,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                     ],
                 ],
             ],
@@ -437,14 +437,14 @@ public function resourceObjectTypeFieldsProvider(): array
                         'description' => null,
                         'args' => [],
                         'resolve' => null,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                     ],
                     'name_converted' => [
                         'type' => GraphQLType::nonNull(GraphQLType::string()),
                         'description' => null,
                         'args' => [],
                         'resolve' => null,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                     ],
                 ],
             ],
@@ -463,7 +463,7 @@ public function resourceObjectTypeFieldsProvider(): array
                         'description' => null,
                         'args' => [],
                         'resolve' => null,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                     ],
                 ],
             ],
@@ -483,7 +483,7 @@ public function resourceObjectTypeFieldsProvider(): array
                         'description' => null,
                         'args' => [],
                         'resolve' => null,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                     ],
                 ],
             ],
@@ -511,14 +511,14 @@ public function resourceObjectTypeFieldsProvider(): array
                         'description' => null,
                         'args' => [],
                         'resolve' => null,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                     ],
                     '_id' => [
                         'type' => GraphQLType::nonNull(GraphQLType::string()),
                         'description' => null,
                         'args' => [],
                         'resolve' => null,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                     ],
                     'clientMutationId' => GraphQLType::string(),
                 ],
@@ -546,7 +546,7 @@ public function resourceObjectTypeFieldsProvider(): array
                         'description' => null,
                         'args' => [],
                         'resolve' => null,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                     ],
                     'clientMutationId' => GraphQLType::string(),
                 ],
@@ -565,7 +565,7 @@ public function resourceObjectTypeFieldsProvider(): array
                         'description' => null,
                         'args' => [],
                         'resolve' => null,
-                        'deprecationReason' => '',
+                        'deprecationReason' => null,
                     ],
                     'clientMutationId' => GraphQLType::string(),
                 ],