diff --git a/assets/js/gutenberg-blocks.js b/assets/js/gutenberg-blocks.js
index 944b8667..1c5293be 100644
--- a/assets/js/gutenberg-blocks.js
+++ b/assets/js/gutenberg-blocks.js
@@ -16,10 +16,12 @@
 
   var el = wp.element.createElement;
   var Fragment = wp.element.Fragment;
-  var registerBlockType = wp.blocks.registerBlockType;
-  var InspectorControls = wp.blockEditor ? wp.blockEditor.InspectorControls : (wp.editor ? wp.editor.InspectorControls : null);
-  var InnerBlocks = wp.blockEditor ? wp.blockEditor.InnerBlocks : (wp.editor ? wp.editor.InnerBlocks : null);
-  var RichText = wp.blockEditor ? wp.blockEditor.RichText : (wp.editor ? wp.editor.RichText : null);
+  var registerBlockTypeRaw = wp.blocks.registerBlockType;
+  var blockEditor = wp.blockEditor || wp.editor || {};
+  var InspectorControls = blockEditor.InspectorControls || null;
+  var InnerBlocks = blockEditor.InnerBlocks || null;
+  var RichText = blockEditor.RichText || null;
+  var MediaUpload = blockEditor.MediaUpload || null;
   var ColorPicker = wp.components.ColorPicker;
   var PanelBody = wp.components.PanelBody;
   var SelectControl = wp.components.SelectControl;
@@ -27,7 +29,7 @@
   var ToggleControl = wp.components.ToggleControl;
   var RangeControl = wp.components.RangeControl;
 
-  if (!registerBlockType || !el) return;
+  if (!registerBlockTypeRaw || !el) return;
 
   // ── Helper: create element shorthand ──
   function h(tag, props, children) {
@@ -55,6 +57,33 @@
     h('path', { d: 'M12 2L2 7l10 5 10-5-10-5zM2 17l10 5 10-5M2 12l10 5 10-5', fill: 'none', stroke: 'currentColor', strokeWidth: 2 })
   );
 
+  // Register category BEFORE any registerBlockType (filter-after-register is too late).
+  if (window.wp.hooks && window.wp.hooks.addFilter) {
+    wp.hooks.addFilter('blocks.getBlockCategories', 'aksrt/block-categories', function (categories) {
+      var list = Array.isArray(categories) ? categories.slice() : [];
+      var hasAksrt = list.some(function (c) { return c && c.slug === CATEGORY; });
+      if (hasAksrt) return list;
+      list.push({
+        slug: CATEGORY,
+        title: 'AKSRT',
+        icon: null,
+      });
+      return list;
+    });
+  }
+
+  // WP 6.9+ expects apiVersion 3 for iframe editor compatibility.
+  function registerBlockType(name, settings) {
+    settings = settings || {};
+    if (settings.apiVersion == null) {
+      settings.apiVersion = 3;
+    }
+    if (!settings.category) {
+      settings.category = CATEGORY;
+    }
+    return registerBlockTypeRaw(name, settings);
+  }
+
   // ================================================================
   // 1. Tabs Block
   // ================================================================
@@ -627,22 +656,9 @@
     },
   });
 
-  // ── Register block category ──
-
-  if (window.wp.hooks && window.wp.hooks.addFilter) {
-    wp.hooks.addFilter('blocks.getBlockCategories', 'aksrt/block-categories', function (categories) {
-      var hasAksrt = categories.some(function (c) { return c.slug === CATEGORY; });
-      if (hasAksrt) return categories;
-      return categories.concat([{
-        slug: CATEGORY,
-        title: 'AKSRT',
-        icon: BLOCK_ICON,
-      }]);
-    });
-  }
-
   // ── Carousel Block (Gallery → Swiper) ──
-  if (MediaUpload && InnerBlocks) {
+  // MediaUpload lives on wp.blockEditor; skip registration if unavailable.
+  if (MediaUpload) {
     registerBlockType('aksrt/carousel', {
       title: '轮播图',
       icon: 'images-alt2',
diff --git a/inc/core-hooks/part-3.php b/inc/core-hooks/part-3.php
index 6762538a..a1ddf8b4 100644
--- a/inc/core-hooks/part-3.php
+++ b/inc/core-hooks/part-3.php
@@ -104,6 +104,34 @@ add_action('pre_get_posts', function ($query) {
 // Gutenberg 自定义块注册
 // ============================================================
 
+// Register category server-side so it exists before JS registerBlockType runs.
+// Keep untyped + defensive: some plugins pass unexpected shapes; typed params can 500 the editor.
+add_filter('block_categories_all', static function ($categories, $context = null) {
+    if (!is_array($categories)) {
+        return $categories;
+    }
+
+    foreach ($categories as $category) {
+        $slug = '';
+        if (is_array($category)) {
+            $slug = (string) ($category['slug'] ?? '');
+        } elseif (is_object($category) && isset($category->slug)) {
+            $slug = (string) $category->slug;
+        }
+        if ($slug === 'aksrt-blocks') {
+            return $categories;
+        }
+    }
+
+    $categories[] = [
+        'slug'  => 'aksrt-blocks',
+        'title' => 'AKSRT',
+        'icon'  => null,
+    ];
+
+    return $categories;
+}, 10, 2);
+
 add_action('enqueue_block_editor_assets', function () {
     $base_uri = get_template_directory_uri();
     $version  = wp_get_theme()->get('Version');
@@ -113,7 +141,8 @@ add_action('enqueue_block_editor_assets', function () {
         wp_enqueue_script(
             'aksrt-gutenberg-blocks',
             $base_uri . '/assets/js/gutenberg-blocks.js',
-            ['wp-blocks', 'wp-element', 'wp-components', 'wp-block-editor', 'wp-hooks'],
+            // wp-media-utils: MediaUpload for carousel block
+            ['wp-blocks', 'wp-element', 'wp-components', 'wp-block-editor', 'wp-hooks', 'wp-media-utils'],
             (string) filemtime($blocks_js),
             true
         );