diff --git a/core/modules/block/block.install b/core/modules/block/block.install
new file mode 100644
index 0000000..63b3784
--- /dev/null
+++ b/core/modules/block/block.install
@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * @file
+ * Update functions for the block module.
+ */
+
+/**
+ * Implements hook_update_N().
+ */
+function block_update_8001() {
+  // Load all blocks in the disabled region.
+  /** @var \Drupal\block\BlockInterface[] $blocks */
+  $blocks = \Drupal::entityManager()
+    ->getStorage('block')
+    ->loadByProperties(['region' => -1]);
+
+  // Disable each block and assign them to the default region.
+  foreach ($blocks as $block) {
+    $block
+      ->disable()
+      ->setRegion(system_default_region($block->getTheme()))
+      ->save();
+  }
+}