diff --git a/CHN-01-概述.md b/CHN-01-概述.md
index d943bd9..3b6b543 100644
--- a/CHN-01-概述.md
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@@ -1,6 +1,6 @@
 [English](ENG-01-Overview) | [简体中文](CHN-01-概述)
 
-**Drogon**是一个基于C++14/17的Http应用框架，使用Drogon可以方便的使用C++构建各种类型的Web应用服务端程序。
+**Drogon**是一个基于C++17/20的Http应用框架，使用Drogon可以方便的使用C++构建各种类型的Web应用服务端程序。
 
 Drogon的主要应用平台是Linux，也支持Mac OS、FreeBSD和Windows。
 
diff --git a/ENG-01-Overview.md b/ENG-01-Overview.md
index cea86d6..e03c4be 100644
--- a/ENG-01-Overview.md
+++ b/ENG-01-Overview.md
@@ -1,6 +1,6 @@
 [English](ENG-01-Overview) | [简体中文](CHN-01-概述)
 
-**Drogon** is a C++14/17-based HTTP application framework. Drogon can be used to easily build various types of web application server programs using C++.
+**Drogon** is a C++17/20-based HTTP application framework. Drogon can be used to easily build various types of web application server programs using C++.
 
 **Drogon** is the name of a dragon in the American TV series "Game of Thrones" that I really like.
 
diff --git a/_Cover.md b/_Cover.md
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 }
 </style>
 
-![logo](images/drogon-concise-white.png)
+![logo](images/drogon-white17.jpg)
 
 > Run your application anywhere, knowing it is as fast as it could be. 
 
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