diff --git a/README-zh.md b/README-zh.md
index a535287..79f7339 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -266,7 +266,7 @@ sudo ikev2.sh
 
 **[配置 IPsec/XAuth ("Cisco IPsec") VPN 客户端](docs/clients-xauth-zh.md)**
 
-**阅读 [:book: VPN book](https://books2read.com/vpnzh) 以访问 [额外内容](https://ko-fi.com/post/Support-this-project-and-get-access-to-supporter-o-X8X5FVFZC)。**
+**阅读 [:book: VPN book](https://ko-fi.com/post/Support-this-project-and-get-access-to-supporter-o-X8X5FVFZC) 以访问 [额外内容](https://ko-fi.com/post/Support-this-project-and-get-access-to-supporter-o-X8X5FVFZC)。**
 
 开始使用自己的专属 VPN! :sparkles::tada::rocket::sparkles:
 
diff --git a/README.md b/README.md
index af2387a..3f7a059 100644
--- a/README.md
+++ b/README.md
@@ -266,7 +266,7 @@ Get your computer or device to use the VPN. Please refer to:
 
 **[Configure IPsec/XAuth ("Cisco IPsec") VPN Clients](docs/clients-xauth.md)**
 
-**Read [:book: VPN book](https://books2read.com/vpn) to access [extra content](https://ko-fi.com/post/Support-this-project-and-get-access-to-supporter-o-O5O7FVF8J).**
+**Read [:book: VPN book](https://ko-fi.com/post/Support-this-project-and-get-access-to-supporter-o-O5O7FVF8J) to access [extra content](https://ko-fi.com/post/Support-this-project-and-get-access-to-supporter-o-O5O7FVF8J).**
 
 Enjoy your very own VPN! :sparkles::tada::rocket::sparkles:
 
diff --git a/docs/ikev2-howto-zh.md b/docs/ikev2-howto-zh.md
index ef3514d..0b29dff 100644
--- a/docs/ikev2-howto-zh.md
+++ b/docs/ikev2-howto-zh.md
@@ -40,7 +40,7 @@ Libreswan 支持通过使用 RSA 签名算法的 X.509 Machine Certificates 来
 在某些情况下，你可能需要更改 IKEv2 服务器地址，例如切换为使用域名，或者在服务器的 IP 更改之后。要了解更多信息，参见 [这一小节](#更改-ikev2-服务器地址)。
 </details>
 
-**阅读 [:book: VPN book](https://books2read.com/vpnzh) 以访问 [额外内容](https://ko-fi.com/post/Support-this-project-and-get-access-to-supporter-o-X8X5FVFZC)。**
+**阅读 [:book: VPN book](https://ko-fi.com/post/Support-this-project-and-get-access-to-supporter-o-X8X5FVFZC) 以访问 [额外内容](https://ko-fi.com/post/Support-this-project-and-get-access-to-supporter-o-X8X5FVFZC)。**
 
 ### Windows 7, 8, 10 和 11
 
diff --git a/docs/ikev2-howto.md b/docs/ikev2-howto.md
index 0ca9a1e..8e8921e 100644
--- a/docs/ikev2-howto.md
+++ b/docs/ikev2-howto.md
@@ -40,7 +40,7 @@ Learn how to change the IKEv2 server address.
 In certain circumstances, you may need to change the IKEv2 server address. For example, to switch to use a DNS name, or after server IP changes. Learn more in [this section](#change-ikev2-server-address).
 </details>
 
-**Read [:book: VPN book](https://books2read.com/vpn) to access [extra content](https://ko-fi.com/post/Support-this-project-and-get-access-to-supporter-o-O5O7FVF8J).**
+**Read [:book: VPN book](https://ko-fi.com/post/Support-this-project-and-get-access-to-supporter-o-O5O7FVF8J) to access [extra content](https://ko-fi.com/post/Support-this-project-and-get-access-to-supporter-o-O5O7FVF8J).**
 
 ### Windows 7, 8, 10 and 11