diff --git a/modules/openapi_docs/openapi_docs.module b/modules/openapi_docs/openapi_docs.module
index 6755d96..00db5f7 100644
--- a/modules/openapi_docs/openapi_docs.module
+++ b/modules/openapi_docs/openapi_docs.module
@@ -4,9 +4,9 @@
  * Implements hook_theme().
  */
 function openapi_docs_theme() {
-  return array(
-    'swagger_ui' => array(
+  return [
+    'swagger_ui' => [
       'render element' => 'elements',
-    ),
-  );
+    ],
+  ];
 }
diff --git a/modules/openapi_json_schema/src/Encoder/JsonEncoder.php b/modules/openapi_json_schema/src/Encoder/JsonEncoder.php
index 4f75069..97e6da2 100644
--- a/modules/openapi_json_schema/src/Encoder/JsonEncoder.php
+++ b/modules/openapi_json_schema/src/Encoder/JsonEncoder.php
@@ -16,7 +16,7 @@ class JsonEncoder extends DrupalJsonEncoder {
    *
    * @var string
    */
-  protected static $format = array('json_schema', 'hal_json_schema');
+  protected static $format = ['json_schema', 'hal_json_schema'];
 
   /**
    * {@inheritdoc}
diff --git a/modules/openapi_json_schema/src/Normalizer/ComplexDataDefinitionNormalizer.php b/modules/openapi_json_schema/src/Normalizer/ComplexDataDefinitionNormalizer.php
index 910bb16..8526c10 100644
--- a/modules/openapi_json_schema/src/Normalizer/ComplexDataDefinitionNormalizer.php
+++ b/modules/openapi_json_schema/src/Normalizer/ComplexDataDefinitionNormalizer.php
@@ -26,7 +26,7 @@ class ComplexDataDefinitionNormalizer extends DataDefinitionNormalizer {
   /**
    * {@inheritdoc}
    */
-  public function normalize($entity, $format = NULL, array $context = array()) {
+  public function normalize($entity, $format = NULL, array $context = []) {
     /* @var $entity \Drupal\Core\TypedData\ComplexDataDefinitionInterface */
     $context['parent'] = $entity;
     $normalized = $this->extractPropertyData($entity);
diff --git a/modules/openapi_json_schema/src/Normalizer/DataDefinitionNormalizer.php b/modules/openapi_json_schema/src/Normalizer/DataDefinitionNormalizer.php
index 3ccfc12..271499c 100644
--- a/modules/openapi_json_schema/src/Normalizer/DataDefinitionNormalizer.php
+++ b/modules/openapi_json_schema/src/Normalizer/DataDefinitionNormalizer.php
@@ -27,7 +27,7 @@ class DataDefinitionNormalizer extends NormalizerBase {
    *
    * @var array
    */
-  protected $formats = array('json_schema', 'hal_json_schema');
+  protected $formats = ['json_schema', 'hal_json_schema'];
 
   /**
    * The interface or class that this Normalizer supports.
@@ -39,7 +39,7 @@ class DataDefinitionNormalizer extends NormalizerBase {
   /**
    * {@inheritdoc}
    */
-  public function normalize($entity, $format = NULL, array $context = array()) {
+  public function normalize($entity, $format = NULL, array $context = []) {
     /* @var $entity \Drupal\Core\TypedData\DataDefinitionInterface */
     // `text source` and `date source` produce objects not supported in the API.
     // It is not clear how the API excludes them.
diff --git a/modules/openapi_json_schema/src/Normalizer/DataReferenceDefinitionNormalizer.php b/modules/openapi_json_schema/src/Normalizer/DataReferenceDefinitionNormalizer.php
index 40d394c..4fa8a38 100644
--- a/modules/openapi_json_schema/src/Normalizer/DataReferenceDefinitionNormalizer.php
+++ b/modules/openapi_json_schema/src/Normalizer/DataReferenceDefinitionNormalizer.php
@@ -44,7 +44,7 @@ class DataReferenceDefinitionNormalizer extends DataDefinitionNormalizer {
   /**
    * {@inheritdoc}
    */
-  public function normalize($entity, $format = NULL, array $context = array()) {
+  public function normalize($entity, $format = NULL, array $context = []) {
     /* @var $entity \Drupal\Core\TypedData\DataReferenceDefinitionInterface */
     if (!$this->validateEntity($entity)) {
       return [];
diff --git a/modules/openapi_json_schema/src/Normalizer/FieldDefinitionNormalizer.php b/modules/openapi_json_schema/src/Normalizer/FieldDefinitionNormalizer.php
index b141fc0..c3285d6 100644
--- a/modules/openapi_json_schema/src/Normalizer/FieldDefinitionNormalizer.php
+++ b/modules/openapi_json_schema/src/Normalizer/FieldDefinitionNormalizer.php
@@ -23,7 +23,7 @@ class FieldDefinitionNormalizer extends ListDataDefinitionNormalizer {
   /**
    * {@inheritdoc}
    */
-  public function normalize($entity, $format = NULL, array $context = array()) {
+  public function normalize($entity, $format = NULL, array $context = []) {
     /* @var $entity \Drupal\Core\Field\FieldDefinitionInterface */
     $normalized = parent::normalize($entity, $format, $context);
 
diff --git a/modules/openapi_json_schema/src/Normalizer/ListDataDefinitionNormalizer.php b/modules/openapi_json_schema/src/Normalizer/ListDataDefinitionNormalizer.php
index e85be1d..dadbb45 100644
--- a/modules/openapi_json_schema/src/Normalizer/ListDataDefinitionNormalizer.php
+++ b/modules/openapi_json_schema/src/Normalizer/ListDataDefinitionNormalizer.php
@@ -25,7 +25,7 @@ class ListDataDefinitionNormalizer extends DataDefinitionNormalizer {
   /**
    * {@inheritdoc}
    */
-  public function normalize($entity, $format = NULL, array $context = array()) {
+  public function normalize($entity, $format = NULL, array $context = []) {
     /* @var $entity \Drupal\Core\TypedData\ListDataDefinitionInterface */
     $context['parent'] = $entity;
     $property = $this->extractPropertyData($entity, $context);
diff --git a/modules/openapi_json_schema/src/Normalizer/NormalizerBase.php b/modules/openapi_json_schema/src/Normalizer/NormalizerBase.php
index fa0206f..8ac8592 100644
--- a/modules/openapi_json_schema/src/Normalizer/NormalizerBase.php
+++ b/modules/openapi_json_schema/src/Normalizer/NormalizerBase.php
@@ -17,7 +17,7 @@ abstract class NormalizerBase extends SerializationNormalizerBase implements Den
    *
    * @var array
    */
-  protected $formats = array('json_schema');
+  protected $formats = ['json_schema'];
 
   /**
    * {@inheritdoc}
@@ -36,7 +36,7 @@ abstract class NormalizerBase extends SerializationNormalizerBase implements Den
   /**
    * {@inheritdoc}
    */
-  public function denormalize($data, $class, $format = NULL, array $context = array()) {
+  public function denormalize($data, $class, $format = NULL, array $context = []) {
     return FALSE;
   }
 
diff --git a/modules/openapi_json_schema/src/Normalizer/SchemataSchemaNormalizer.php b/modules/openapi_json_schema/src/Normalizer/SchemataSchemaNormalizer.php
index 3c767e2..900a0f9 100644
--- a/modules/openapi_json_schema/src/Normalizer/SchemataSchemaNormalizer.php
+++ b/modules/openapi_json_schema/src/Normalizer/SchemataSchemaNormalizer.php
@@ -39,7 +39,7 @@ class SchemataSchemaNormalizer extends NormalizerBase {
   /**
    * {@inheritdoc}
    */
-  public function normalize($entity, $format = NULL, array $context = array()) {
+  public function normalize($entity, $format = NULL, array $context = []) {
     // Create the array of normalized fields, starting with the URI.
     /* @var $entity \Drupal\openapi_json_schema\Schema\SchemaInterface */
     $normalized = [
diff --git a/modules/openapi_json_schema/src/Plugin/Type/TypeMapperPluginManager.php b/modules/openapi_json_schema/src/Plugin/Type/TypeMapperPluginManager.php
index 0b48fa9..8ee77d6 100644
--- a/modules/openapi_json_schema/src/Plugin/Type/TypeMapperPluginManager.php
+++ b/modules/openapi_json_schema/src/Plugin/Type/TypeMapperPluginManager.php
@@ -40,7 +40,7 @@ class TypeMapperPluginManager extends DefaultPluginManager implements FallbackPl
   /**
    * {@inheritdoc}
    */
-  public function getFallbackPluginId($plugin_id, array $configuration = array()) {
+  public function getFallbackPluginId($plugin_id, array $configuration = []) {
     return static::FALLBACK_TYPE_MAPPER;
   }