diff --git a/src/Block.php b/src/Block.php
index c82f58b..ece0860 100644
--- a/src/Block.php
+++ b/src/Block.php
@@ -263,6 +263,13 @@ abstract class Block extends Composer implements BlockContract
      */
     public $template = [];
 
+    /**
+     * The allowed inner blocks.
+     *
+     * @var array
+     */
+    public $allowed_blocks = [];
+
     /**
      * Determine whether to save the block's data as post meta.
      *
@@ -412,6 +419,14 @@ public function getSupports(): array
         return $supports->all();
     }
 
+    /**
+     * Retrieve the allowed inner blocks.
+     */
+    public function getAllowedBlocks(): array
+    {
+        return $this->allowed_blocks;
+    }
+
     /**
      * Retrieve the block support attributes.
      */
@@ -668,6 +683,7 @@ public function settings(): Collection
             'api_version' => $this->getApiVersion(),
             'validate' => $this->validate,
             'use_post_meta' => $this->usePostMeta,
+            'allowed_blocks' => $this->getAllowedBlocks(),
             'render_callback' => function (
                 $block,
                 $content = '',
@@ -739,6 +755,7 @@ public function toJson(): string
                 'render_callback',
                 'use_post_meta',
                 'validate',
+                'allowed_blocks',
             ]);
 
         return $settings->filter()->toJson(JSON_PRETTY_PRINT);