diff --git a/src/OneBot/V12/Object/Action.php b/src/OneBot/V12/Object/Action.php
index 54cc5cd..813d153 100644
--- a/src/OneBot/V12/Object/Action.php
+++ b/src/OneBot/V12/Object/Action.php
@@ -4,12 +4,10 @@
 
 namespace OneBot\V12\Object;
 
-use ReturnTypeWillChange;
-
 /**
  * OneBot 12 标准的 Action 请求对象
  */
-class Action implements \JsonSerializable, \IteratorAggregate
+class Action implements \JsonSerializable, \IteratorAggregate, \Stringable
 {
     /** @var string 动作名称 */
     public string $action = '';
@@ -20,6 +18,8 @@ class Action implements \JsonSerializable, \IteratorAggregate
     /** @var mixed 回包消息 */
     public $echo;
 
+    public ?array $self;
+
     /**
      * 创建新的动作实例
      *
@@ -27,11 +27,17 @@ class Action implements \JsonSerializable, \IteratorAggregate
      * @param array  $params 动作参数
      * @param mixed  $echo
      */
-    public function __construct(string $action, array $params = [], $echo = null)
+    public function __construct(string $action, array $params = [], $echo = null, ?array $self = null)
     {
         $this->action = $action;
         $this->params = $params;
         $this->echo = $echo;
+        $this->self = $self;
+    }
+
+    public function __toString()
+    {
+        return json_encode($this->jsonSerialize(), JSON_UNESCAPED_SLASHES);
     }
 
     /**
@@ -39,22 +45,22 @@ public function __construct(string $action, array $params = [], $echo = null)
      */
     public static function fromArray(array $arr): Action
     {
-        return new self($arr['action'], $arr['params'] ?? [], $arr['echo'] ?? null);
+        return new self($arr['action'], $arr['params'] ?? [], $arr['echo'] ?? null, $arr['self'] ?? null);
     }
 
     public function jsonSerialize(): array
     {
-        if ($this->echo === null) {
-            return [
-                'action' => $this->action,
-                'params' => $this->params,
-            ];
-        }
-        return [
+        $d = [
             'action' => $this->action,
             'params' => $this->params,
-            'echo' => $this->echo,
         ];
+        if ($this->echo !== null) {
+            $d['echo'] = $this->echo;
+        }
+        if ($this->self !== null) {
+            $d['self'] = $this->self;
+        }
+        return $d;
     }
 
     /**
@@ -63,6 +69,6 @@ public function jsonSerialize(): array
     #[\ReturnTypeWillChange]
     public function getIterator(): \ArrayIterator
     {
-        return new \ArrayIterator($this);
+        return new \ArrayIterator($this->jsonSerialize());
     }
 }
diff --git a/src/OneBot/V12/Object/OneBotEvent.php b/src/OneBot/V12/Object/OneBotEvent.php
index ec33e53..488bdd3 100644
--- a/src/OneBot/V12/Object/OneBotEvent.php
+++ b/src/OneBot/V12/Object/OneBotEvent.php
@@ -22,6 +22,20 @@
  * @method          getChannelId()
  * @method          getOperatorId()
  * @method          getMessageId()
+ * @method          setId(string $id)
+ * @method          setType(string $type)
+ * @method          setSelf(array $self)
+ * @method          setDetailType(string $detail_type)
+ * @method          setSubType(string $sub_type)
+ * @method          setTime(float|int $time)
+ * @method          setAltMessage(string $alt_message)
+ * @method          setGroupId(string $group_id)
+ * @method          setUserId(string $user_id)
+ * @method          setGuildId(string $guild_id)
+ * @method          setChannelId(string $channel_id)
+ * @method          setOperatorId(string $operator_id)
+ * @method          setMessageId(string $message_id)
+ * @method          setMessage(array|MessageSegment|string|\Stringable $message)
  * @property string $id
  * @property string $type
  * @property array  $self
@@ -53,6 +67,14 @@ public function __call(string $name, array $args = [])
             }
             return null;
         }
+        if (str_starts_with($name, 'set')) {
+            $key = Utils::camelToSeparator(substr($name, 3));
+            if (isset($this->data[$key])) {
+                $this->data[$key] = $args[0];
+                return true;
+            }
+            return false;
+        }
         throw new \BadMethodCallException('Call to undefined method ' . __CLASS__ . '::' . $name . '()');
     }
 
diff --git a/src/OneBot/global_defines.php b/src/OneBot/global_defines.php
index 2ecbf59..ad684bb 100644
--- a/src/OneBot/global_defines.php
+++ b/src/OneBot/global_defines.php
@@ -13,7 +13,7 @@
 use ZM\Logger\ConsoleLogger;
 
 const ONEBOT_VERSION = '12';
-const ONEBOT_LIBOB_VERSION = '0.4.3';
+const ONEBOT_LIBOB_VERSION = '0.4.4';
 
 const ONEBOT_JSON = 1;
 const ONEBOT_MSGPACK = 2;