diff --git a/modules/bibcite_bibtex/src/Encoder/BibtexEncoder.php b/modules/bibcite_bibtex/src/Encoder/BibtexEncoder.php
index d009e4a..1c61661 100644
--- a/modules/bibcite_bibtex/src/Encoder/BibtexEncoder.php
+++ b/modules/bibcite_bibtex/src/Encoder/BibtexEncoder.php
@@ -28,7 +28,7 @@ class BibtexEncoder implements EncoderInterface, DecoderInterface {
   /**
    * {@inheritdoc}
    */
-  public function decode($data, $format, array $context = array()) {
+  public function decode($data, $format, array $context = []) {
     $parsed = BibtexParser::parse_string($data);
 
     $this->processEntries($parsed);
@@ -66,7 +66,7 @@ class BibtexEncoder implements EncoderInterface, DecoderInterface {
   /**
    * {@inheritdoc}
    */
-  public function encode($data, $format, array $context = array()) {
+  public function encode($data, $format, array $context = []) {
     if (isset($data['type'])) {
       $data = [$data];
     }
diff --git a/modules/bibcite_bibtex/src/EventSubscriber/BibtexSubscriber.php b/modules/bibcite_bibtex/src/EventSubscriber/BibtexSubscriber.php
index 66f4cf0..bf42c2f 100644
--- a/modules/bibcite_bibtex/src/EventSubscriber/BibtexSubscriber.php
+++ b/modules/bibcite_bibtex/src/EventSubscriber/BibtexSubscriber.php
@@ -16,14 +16,14 @@ class BibtexSubscriber implements EventSubscriberInterface {
    *   The Event to process.
    */
   public function onKernelRequest(GetResponseEvent $event) {
-    $event->getRequest()->setFormat('bibtex', array('application/x-bibtex'));
+    $event->getRequest()->setFormat('bibtex', ['application/x-bibtex']);
   }
 
   /**
    * Implements \Symfony\Component\EventDispatcher\EventSubscriberInterface::getSubscribedEvents().
    */
   public static function getSubscribedEvents() {
-    $events[KernelEvents::REQUEST][] = array('onKernelRequest');
+    $events[KernelEvents::REQUEST][] = ['onKernelRequest'];
     return $events;
   }
 
diff --git a/modules/bibcite_bibtex/src/Normalizer/BibtexReferenceNormalizer.php b/modules/bibcite_bibtex/src/Normalizer/BibtexReferenceNormalizer.php
index c89b7e8..9c913ea 100644
--- a/modules/bibcite_bibtex/src/Normalizer/BibtexReferenceNormalizer.php
+++ b/modules/bibcite_bibtex/src/Normalizer/BibtexReferenceNormalizer.php
@@ -37,7 +37,7 @@ class BibtexReferenceNormalizer extends ReferenceNormalizerBase {
   /**
    * {@inheritdoc}
    */
-  public function normalize($reference, $format = NULL, array $context = array()) {
+  public function normalize($reference, $format = NULL, array $context = []) {
     /** @var \Drupal\bibcite_entity\Entity\ReferenceInterface $reference */
 
     $attributes = [];
diff --git a/modules/bibcite_entity/src/Entity/Contributor.php b/modules/bibcite_entity/src/Entity/Contributor.php
index 4ceb1ac..a691fb6 100644
--- a/modules/bibcite_entity/src/Entity/Contributor.php
+++ b/modules/bibcite_entity/src/Entity/Contributor.php
@@ -171,10 +171,10 @@ class Contributor extends ContentEntityBase implements ContributorInterface {
     $fields['prefix'] = BaseFieldDefinition::create('string')
       ->setLabel(t('Prefix'))
       ->setDefaultValue('')
-      ->setDisplayOptions('form', array(
+      ->setDisplayOptions('form', [
         'type' => 'string_textfield',
         'weight' => 1,
-      ))
+      ])
       ->setDisplayOptions('view', [
         'label' => 'inline',
         'type' => 'string',
@@ -184,10 +184,10 @@ class Contributor extends ContentEntityBase implements ContributorInterface {
     $fields['first_name'] = BaseFieldDefinition::create('string')
       ->setLabel(t('First name'))
       ->setDefaultValue('')
-      ->setDisplayOptions('form', array(
+      ->setDisplayOptions('form', [
         'type' => 'string_textfield',
         'weight' => 2,
-      ))
+      ])
       ->setDisplayOptions('view', [
         'label' => 'inline',
         'type' => 'string',
@@ -198,10 +198,10 @@ class Contributor extends ContentEntityBase implements ContributorInterface {
       ->setLabel(t('Last name'))
       ->setDefaultValue('')
       ->setRequired(TRUE)
-      ->setDisplayOptions('form', array(
+      ->setDisplayOptions('form', [
         'type' => 'string_textfield',
         'weight' => 3,
-      ))
+      ])
       ->setDisplayOptions('view', [
         'label' => 'inline',
         'type' => 'string',
@@ -211,10 +211,10 @@ class Contributor extends ContentEntityBase implements ContributorInterface {
     $fields['suffix'] = BaseFieldDefinition::create('string')
       ->setLabel(t('Suffix'))
       ->setDefaultValue('')
-      ->setDisplayOptions('form', array(
+      ->setDisplayOptions('form', [
         'type' => 'string_textfield',
         'weight' => 4,
-      ))
+      ])
       ->setDisplayOptions('view', [
         'label' => 'inline',
         'type' => 'string',
diff --git a/modules/bibcite_entity/src/Entity/Keyword.php b/modules/bibcite_entity/src/Entity/Keyword.php
index 3f31d6f..f61fd55 100644
--- a/modules/bibcite_entity/src/Entity/Keyword.php
+++ b/modules/bibcite_entity/src/Entity/Keyword.php
@@ -104,15 +104,15 @@ class Keyword extends ContentEntityBase implements KeywordInterface {
     $fields['name'] = BaseFieldDefinition::create('string')
       ->setLabel(t('Name'))
       ->setDescription(t('The value of the Keyword.'))
-      ->setSettings(array(
+      ->setSettings([
         'max_length' => 255,
         'text_processing' => 0,
-      ))
+      ])
       ->setDefaultValue('')
-      ->setDisplayOptions('form', array(
+      ->setDisplayOptions('form', [
         'type' => 'string_textfield',
         'weight' => -4,
-      ))
+      ])
       ->setDisplayOptions('view', [
         'label' => 'above',
         'type' => 'string',
diff --git a/modules/bibcite_entity/src/Normalizer/CslReferenceNormalizer.php b/modules/bibcite_entity/src/Normalizer/CslReferenceNormalizer.php
index f0c4c5d..3efac8d 100644
--- a/modules/bibcite_entity/src/Normalizer/CslReferenceNormalizer.php
+++ b/modules/bibcite_entity/src/Normalizer/CslReferenceNormalizer.php
@@ -35,7 +35,7 @@ class CslReferenceNormalizer extends ReferenceNormalizerBase {
   /**
    * {@inheritdoc}
    */
-  public function normalize($reference, $format = NULL, array $context = array()) {
+  public function normalize($reference, $format = NULL, array $context = []) {
     /** @var \Drupal\bibcite_entity\Entity\ReferenceInterface $reference */
 
     $attributes = [];
diff --git a/modules/bibcite_entity/src/Plugin/Field/FieldWidget/ContributorWidget.php b/modules/bibcite_entity/src/Plugin/Field/FieldWidget/ContributorWidget.php
index 60549a2..5e2fbd9 100644
--- a/modules/bibcite_entity/src/Plugin/Field/FieldWidget/ContributorWidget.php
+++ b/modules/bibcite_entity/src/Plugin/Field/FieldWidget/ContributorWidget.php
@@ -91,10 +91,10 @@ class ContributorWidget extends EntityReferenceAutocompleteWidget implements Con
     $element['#attributes']['class'][] = 'container-inline';
 
     $entity = $items->getEntity();
-    $element['target_id']['#autocreate'] = array(
+    $element['target_id']['#autocreate'] = [
       'bundle' => 'bibcite_contributor',
       'uid' => ($entity instanceof EntityOwnerInterface) ? $entity->getOwnerId() : \Drupal::currentUser()->id(),
-    );
+    ];
 
     return $element;
   }
diff --git a/modules/bibcite_ris/src/Encoder/RISEncoder.php b/modules/bibcite_ris/src/Encoder/RISEncoder.php
index 1caee62..a71f9d0 100644
--- a/modules/bibcite_ris/src/Encoder/RISEncoder.php
+++ b/modules/bibcite_ris/src/Encoder/RISEncoder.php
@@ -28,7 +28,7 @@ class RISEncoder implements EncoderInterface, DecoderInterface {
   /**
    * {@inheritdoc}
    */
-  public function decode($data, $format, array $context = array()) {
+  public function decode($data, $format, array $context = []) {
     /*
      * Workaround for weird behavior of "LibRIS" library.
      *
@@ -62,7 +62,7 @@ class RISEncoder implements EncoderInterface, DecoderInterface {
   /**
    * {@inheritdoc}
    */
-  public function encode($data, $format, array $context = array()) {
+  public function encode($data, $format, array $context = []) {
     if (isset($data['TY'])) {
       $data = [$data];
     }
diff --git a/modules/bibcite_ris/src/Normalizer/RISReferenceNormalizer.php b/modules/bibcite_ris/src/Normalizer/RISReferenceNormalizer.php
index 4af8ab0..55e7af2 100644
--- a/modules/bibcite_ris/src/Normalizer/RISReferenceNormalizer.php
+++ b/modules/bibcite_ris/src/Normalizer/RISReferenceNormalizer.php
@@ -37,7 +37,7 @@ class RISReferenceNormalizer extends ReferenceNormalizerBase {
   /**
    * {@inheritdoc}
    */
-  public function normalize($reference, $format = NULL, array $context = array()) {
+  public function normalize($reference, $format = NULL, array $context = []) {
     /** @var \Drupal\bibcite_entity\Entity\ReferenceInterface $reference */
     $attributes = [];