diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1a422486..bd434834 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,14 @@
+### [v1.5.7](https://gitee.com/koogua/course-tencent-cloud/releases/v1.5.7)(2022-08-28)
+
+- 清理群组残留
+- 优化HtmlPurifier缓存目录自动创建
+
 ### [v1.5.6](https://gitee.com/koogua/course-tencent-cloud/releases/v1.5.6)(2022-08-08)
 
 - 增加应用内命令行migrations
 - 移除群组和微聊模块
-- kindeditor替换vditor - markdown转html
+- kindeditor替换vditor
+- markdown转html
 
 ### [v1.5.5](https://gitee.com/koogua/course-tencent-cloud/releases/v1.5.5)(2022-07-27)
 
diff --git a/app/Http/Admin/Controllers/UploadController.php b/app/Http/Admin/Controllers/UploadController.php
index 268ec1a7..26c76045 100644
--- a/app/Http/Admin/Controllers/UploadController.php
+++ b/app/Http/Admin/Controllers/UploadController.php
@@ -148,7 +148,6 @@ class UploadController extends Controller
         $items = [];
 
         $items['user_avatar'] = $service->uploadDefaultUserAvatar();
-        $items['group_avatar'] = $service->uploadDefaultGroupAvatar();
         $items['course_cover'] = $service->uploadDefaultCourseCover();
         $items['package_cover'] = $service->uploadDefaultPackageCover();
         $items['gift_cover'] = $service->uploadDefaultGiftCover();
diff --git a/app/Http/Admin/Views/setting/storage.volt b/app/Http/Admin/Views/setting/storage.volt
index 5e3a45b3..18c13f2f 100644
--- a/app/Http/Admin/Views/setting/storage.volt
+++ b/app/Http/Admin/Views/setting/storage.volt
@@ -117,10 +117,6 @@
                                 <td>用户头像</td>
                                 <td>public/static/admin/img/default/user_cover.png</td>
                             </tr>
-                            <tr>
-                                <td>群组头像</td>
-                                <td>public/static/admin/img/default/group_cover.png</td>
-                            </tr>
                             <tr>
                                 <td>课程封面</td>
                                 <td>public/static/admin/img/default/course_cover.png</td>
diff --git a/app/Library/AppInfo.php b/app/Library/AppInfo.php
index 6fa3bc44..f214b7e6 100644
--- a/app/Library/AppInfo.php
+++ b/app/Library/AppInfo.php
@@ -16,7 +16,7 @@ class AppInfo
 
     protected $link = 'https://koogua.com';
 
-    protected $version = '1.5.6';
+    protected $version = '1.5.7';
 
     public function __get($name)
     {
diff --git a/app/Library/Purifier.php b/app/Library/Purifier.php
index 883a6780..e73fb979 100644
--- a/app/Library/Purifier.php
+++ b/app/Library/Purifier.php
@@ -55,7 +55,13 @@ class Purifier
             $config->set($key, $value);
         }
 
-        $config->set('Cache.SerializerPath', cache_path('purifier'));
+        $serializerPath = cache_path('purifier');
+
+        if (file_exists($serializerPath) == false) {
+            mkdir($serializerPath, 0777);
+        }
+
+        $config->set('Cache.SerializerPath', $serializerPath);
 
         return $config;
     }
diff --git a/app/Services/MyStorage.php b/app/Services/MyStorage.php
index e3af32d4..fe195294 100644
--- a/app/Services/MyStorage.php
+++ b/app/Services/MyStorage.php
@@ -49,20 +49,6 @@ class MyStorage extends Storage
         return $this->putFile($key, $filename);
     }
 
-    /**
-     * 上传默认群组头像
-     *
-     * @return false|mixed|string
-     */
-    public function uploadDefaultGroupAvatar()
-    {
-        $filename = static_path('admin/img/default/group_avatar.png');
-
-        $key = '/img/default/group_avatar.png';
-
-        return $this->putFile($key, $filename);
-    }
-
     /**
      * 上传默认课程封面
      *
diff --git a/public/static/admin/img/default/group_avatar.png b/public/static/admin/img/default/group_avatar.png
deleted file mode 100644
index 579dc1c6..00000000
Binary files a/public/static/admin/img/default/group_avatar.png and /dev/null differ