diff --git a/uw_custom_blocks.post_update.php b/uw_custom_blocks.post_update.php
new file mode 100644
index 0000000000000000000000000000000000000000..e655f04d04dd8dcd18f335da4498ed1c3987b64d
--- /dev/null
+++ b/uw_custom_blocks.post_update.php
@@ -0,0 +1,97 @@
+<?php
+
+/**
+ * @file
+ * Post update hooks for uw_custom_blocks.
+ */
+
+/**
+ * Updating the title for "references" layout builder blocks titles.
+ */
+function uw_custom_blocks_post_update_references_block_titles_updates(&$sandbox) {
+  // Load all nodes. Search for one block (publications reference search), and
+  // update the title is the title is default. Also use setSyncing(TRUE).
+
+  // Repeat the same for the revisions. Make sure to set setSyncing(TRUE)
+  // not to create any additional revisions.
+
+  // Repeat the same for temporary storage.
+
+  // Has to use batching, for all!!!! Maybe splitting it to 3 (node, rev, temp).
+
+  //  $storage = \Drupal::entityTypeManager()->getStorage('node');
+  //  $query = $storage->getQuery();
+  $query = \Drupal::entityQuery('node');
+  $all_nodes = $query->accessCheck(FALSE)->sort('nid', 'DESC')->execute();
+  $count = count($all_nodes);
+  $chunks = array_chunk($all_nodes, 1);
+
+  // Load all revisions for node.
+
+  $operations[] = [
+    '_uw_custom_blocks_post_update_references_block_titles_updates_batch_start',
+    [$count],
+  ];
+
+  foreach ($chunks as $chunk) {
+    $operations[] = [
+      '_uw_custom_blocks_post_update_references_block_titles_updates_operation',
+      $chunk,
+    ];
+  }
+
+  $batch = [
+    'title' => t('Updating block titles.'),
+    'progressive' => TRUE,
+    'operations' => $operations,
+    'finished' => '_uw_custom_blocks_post_update_references_block_titles_updates_finished',
+  ];
+
+  batch_set($batch);
+}
+
+function _uw_custom_blocks_post_update_references_block_titles_updates_batch_start($count, &$context): void {
+  $context['results']['total'] = $count;
+  $context['results']['processed'] = 0;
+}
+
+function _uw_custom_blocks_post_update_references_block_titles_updates_operation($nid, &$context): void {
+  $node = \Drupal::entityTypeManager()->getStorage('node')->load($nid);
+  $node->setSyncing(TRUE);
+  $save_needed = FALSE;
+
+  if ($node) {
+    $layout_builder = $node->get('layout_builder__layout');
+
+    if ($layout_builder) {
+      foreach ($layout_builder->getSections() as &$section) {
+        foreach ($section?->getComponents() as &$component) {
+          if ($component->getPluginId() == 'uw_cbl_publication_search') {
+            $configuration = $component->get('configuration');
+
+            if ($configuration['label'] == 'Publication reference search') {
+              $configuration['label'] = 'Reference search';
+              $component->set('configuration', $configuration);
+              $save_needed = TRUE;
+            }
+          }
+        }
+      }
+    }
+
+    if ($save_needed) {
+      $node->save();
+    }
+  }
+
+
+  if (!isset($context['results']['processed'])) {
+    $context['results']['processed'] = 0;
+  }
+
+  $context['results']['processed']++;
+}
+
+function _uw_custom_blocks_post_update_references_block_titles_updates_finished($success, $results) {
+  $dev = 'halt';
+}