diff --git a/src/Plugin/Field/FieldType/DynamicEntityReferenceItem.php b/src/Plugin/Field/FieldType/DynamicEntityReferenceItem.php
index 4762b68..cf391cc 100644
--- a/src/Plugin/Field/FieldType/DynamicEntityReferenceItem.php
+++ b/src/Plugin/Field/FieldType/DynamicEntityReferenceItem.php
@@ -207,7 +207,8 @@ class DynamicEntityReferenceItem extends EntityReferenceItem {
 
     $settings_form = [];
     $settings = $this->getSettings();
-    foreach (static::getTargetTypes($settings) as $target_type) {
+    // Config entities are excluded from the UI.
+    foreach (static::getTargetTypes($settings, FALSE) as $target_type) {
       $entity_type = \Drupal::entityTypeManager()->getDefinition($target_type);
       $settings_form[$target_type] = $this->targetTypeFieldSettingsForm($form, $form_state, $target_type);
       $settings_form[$target_type]['handler']['#title'] = t('Reference type for @target_type', ['@target_type' => $entity_type->getLabel()]);
@@ -514,15 +515,20 @@ class DynamicEntityReferenceItem extends EntityReferenceItem {
    * @param array $settings
    *   The settings of the field storage.
    *
-   * @return string[]
-   *   All the target entity type ids that can be referenced.
+   * @param bool $include_configuration_entities
+   *   (optional) Include configuration entities. Defaults to TRUE.
+   *
+   * @return \string[] All the target entity type ids that can be referenced.
+   * All the target entity type ids that can be referenced.
    */
-  public static function getTargetTypes($settings) {
+  public static function getTargetTypes($settings, $include_configuration_entities = TRUE) {
     $labels = \Drupal::service('entity_type.repository')->getEntityTypeLabels(TRUE);
     $options = array_keys($labels[(string) t('Content', [], ['context' => 'Entity type group'])]);
 
     // Add configuration entities.
-    $options = array_merge($options, array_keys($labels[(string) t('Configuration', [], ['context' => 'Entity type group'])]));
+    if ($include_configuration_entities) {
+      $options = array_merge($options, array_keys($labels[(string) t('Configuration', [], ['context' => 'Entity type group'])]));
+    }
 
     if (!empty($settings['exclude_entity_types'])) {
       return array_diff($options, $settings['entity_type_ids'] ?: []);
diff --git a/tests/src/Functional/DynamicEntityReferenceTest.php b/tests/src/Functional/DynamicEntityReferenceTest.php
index 42e7448..c94bd5f 100644
--- a/tests/src/Functional/DynamicEntityReferenceTest.php
+++ b/tests/src/Functional/DynamicEntityReferenceTest.php
@@ -98,6 +98,13 @@ class DynamicEntityReferenceTest extends BrowserTestBase {
     $assert_session->fieldExists('default_value_input[field_foobar][0][target_type]');
     $assert_session->optionExists('default_value_input[field_foobar][0][target_type]', 'entity_test');
     $assert_session->optionNotExists('default_value_input[field_foobar][0][target_type]', 'user');
+
+    // Ensure no configuration entities are exposed to the UI.
+    $labels = $this->container->get('entity_type.repository')->getEntityTypeLabels(TRUE);
+    foreach (array_keys($labels[(string) t('Configuration')]) as $entity_type) {
+      $assert_session->fieldNotExists('settings[' . $entity_type . '][handler]');
+    }
+
     $edit = [
       'settings[entity_test_label][handler_settings][target_bundles][entity_test_label]' => TRUE,
       'settings[entity_test_view_builder][handler_settings][target_bundles][entity_test_view_builder]' => TRUE,