diff --git a/db/task_db.py b/db/task_db.py
index af42045..f7ea19d 100644
--- a/db/task_db.py
+++ b/db/task_db.py
@@ -177,15 +177,15 @@ class TaskDBOperator(BaseDBOperator):
         try:
             fields = []
             values = []
+            # 需要序列化的字段
+            json_fields = ['groups', 'content_miniprogram', 'preview_recipients', 'content_link']
+            
             for key, value in updates.items():
-                if key in ['groups', 'content_miniprogram', 'preview_recipients']:
-                    fields.append(f"{key} = %s")
-                    values.append(value)
-                elif key == 'content_link' and isinstance(value, dict):
-                    fields.append(f"{key} = %s")
+                fields.append(f"{key} = %s")
+                # 如果是需要序列化的字段，且值不是字符串类型，则进行序列化
+                if key in json_fields and not isinstance(value, str):
                     values.append(json.dumps(value))
                 else:
-                    fields.append(f"{key} = %s")
                     values.append(value)
             values.append(task_id)