diff --git a/src/Tests/ViewFieldTest.php b/src/Tests/ViewFieldTest.php
index 2b0f4a3..3efe1f9 100644
--- a/src/Tests/ViewFieldTest.php
+++ b/src/Tests/ViewFieldTest.php
@@ -42,7 +42,10 @@ class ViewFieldTest extends BrowserTestBase {
    */
   protected $field;
 
-  protected function setUp() {
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
     parent::setUp();
 
     // Create Basic page and Article node types.
@@ -99,17 +102,16 @@ protected function assertNodeCreated($field_name) {
     // Display article creation form.
     $this->drupalGet('node/add/article');
     $view_select_name = "{$field_name}[0][vname]";
-    $this->assertFieldByName($view_select_name, NULL,'Views select list is displayed.');
-    $this->assertFieldByName("{$field_name}[0][vargs]", '' ,
-      'Views arguments text field is displayed');
+    $this->assertSession()->fieldValueNotEquals($view_select_name, NULL);
+    $this->assertSession()->fieldValueNotEquals("{$field_name}[0][vargs]", '');
 
     $edit = array (
       "title[0][value]" => 'Test',
       $view_select_name => 'user_admin_people|default',
     );
     // create article with viewfield
-    $this->drupalPostForm(NULL, $edit, t('Save and publish'));
-    $this->assertText(t('Article Test has been created.'));
+    $this->submitForm($edit, t('Save and publish'));
+    $this->assertSession()->pageTextContains(t('Article Test has been created.'));
   }
 
   /**
@@ -126,7 +128,7 @@ protected function assertViewDisplays($field_name) {
       "title[0][value]" => 'Test1',
       $view_select_name => 'user_admin_people|default',
     );
-    $this->drupalPostForm(NULL, $edit, t('Save and publish'));
+    $this->submitForm($edit, t('Save and publish'));
 
     // test that the view displays on the node
     $elements = $this->xpath("//div[contains(@class,:class) and contains(@class,:class1)]",
@@ -145,12 +147,12 @@ protected function assertViewDisplays($field_name) {
   protected function assertDefaultViewRequired($field_name) {
     $this->drupalGet("admin/structure/types/manage/article/fields/node.article.{$field_name}");
     $default_chk_name = 'field[settings][force_default]';
-    $this->assertFieldByName($default_chk_name, NULL,'Default value checkbox displayed');
+    $this->assertSession()->fieldValueNotEquals($default_chk_name, NULL);
     $edit = array (
       $default_chk_name => TRUE,
     );
-    $this->drupalPostForm(NULL, $edit, t('Save settings'));
-    $this->assertText('Always use default value requires a default value');
+    $this->submitForm($edit, t('Save settings'));
+    $this->assertSession()->pageTextContains('Always use default value requires a default value');
   }
 
   /**
@@ -162,25 +164,25 @@ protected function assertDefaultViewRequired($field_name) {
   protected function assertDefaultViewSelected($field_name) {
     $this->drupalGet("admin/structure/types/manage/article/fields/node.article.{$field_name}");
     $default_view_select_name = "default_value_input[{$field_name}][0][vname]";
-    $this->assertFieldByName($default_view_select_name, NULL,'Default view select list is displayed');
+    $this->assertSession()->fieldValueNotEquals($default_view_select_name, NULL);
     $edit = array (
       $default_view_select_name => 'user_admin_people|default',
     );
-    $this->drupalPostForm(NULL, $edit, t('Save settings'));
-    $this->assertText("Saved {$field_name} configuration");
+    $this->submitForm($edit, t('Save settings'));
+    $this->assertSession()->pageTextContains("Saved {$field_name} configuration");
 
     // check that the view is preselected on the node form
     $this->drupalGet('node/add/article');
     $view_select_name = "{$field_name}[0][vname]";
 
-    $this->assertFieldByName($view_select_name, 'user_admin_people|default','Views select list is displayed with correct value');
+    $this->assertSession()->fieldValueNotEquals($view_select_name, 'user_admin_people|default');
 
     // return the default value to its original state
     $this->drupalGet("admin/structure/types/manage/article/fields/node.article.{$field_name}");
     $edit = array (
       $default_view_select_name => '0',
     );
-    $this->drupalPostForm(NULL, $edit, t('Save settings'));
+    $this->submitForm($edit, t('Save settings'));
 
   }
 }
diff --git a/templates/viewfield-formatter-default.html.twig b/templates/viewfield-formatter-default.html.twig
index 15fd2a9..809937f 100644
--- a/templates/viewfield-formatter-default.html.twig
+++ b/templates/viewfield-formatter-default.html.twig
@@ -11,10 +11,10 @@
  * @ingroup themeable
  */
 #}
-{% spaceless %}
+{% apply spaceless %}
   <div class="viewfield-wrapper">
     {% if output %}
         <div class="viewfield">{{ output }}</div>
     {% endif %}
   </div>
-{% endspaceless %}
+{% endapply %}
diff --git a/viewfield.info.yml b/viewfield.info.yml
index 4006316..bed2a19 100644
--- a/viewfield.info.yml
+++ b/viewfield.info.yml
@@ -3,7 +3,7 @@ type: module
 description: 'Defines a field type to display a view.'
 version: VERSION
 core: 8.x
-core_version_requirement: ^8 || ^9
+core_version_requirement: ^8 || ^9 || ^10
 dependencies:
   - views
   - field
diff --git a/viewfield.module b/viewfield.module
index ea08bf5..9c8f8d1 100644
--- a/viewfield.module
+++ b/viewfield.module
@@ -26,7 +26,7 @@ function viewfield_preprocess_viewfield_formatter_default(&$variables) {
   $element['#view']->setExposedInput($element['#exposed_settings']);
   $args = !empty($element['#view_arguments']) ? array($element['#view_arguments']) : array();
   $view_el = $element['#view']->preview($element['#view_display'], $args);
-  $output = render($view_el);
+  $output = \Drupal::service('renderer')->render($view_el);
   $variables['output'] = $output;
 }
 
@@ -34,11 +34,11 @@ function viewfield_preprocess_viewfield_formatter_default(&$variables) {
  * Implements hook_element_info().
  */
 function viewfield_element_info() {
-  $types['viewfield'] = array(
-    '#pre_render' => array('viewfield_pre_render'),
+  $types['viewfield'] = [
+    '#pre_render' => ['viewfield_pre_render'],
     '#theme' => 'viewfield_formatter_default',
-    '#post_render' => array('viewfield_post_render'),
-  );
+    '#post_render' => ['viewfield_post_render'],
+  ];
   return $types;
 }