diff --git a/docs/sensors/smart_modules/gpio_expansion_board.md b/docs/sensors/smart_modules/gpio_expansion_board.md
index 9ef05af..806586a 100644
--- a/docs/sensors/smart_modules/gpio_expansion_board.md
+++ b/docs/sensors/smart_modules/gpio_expansion_board.md
@@ -52,15 +52,15 @@
 
 ### Arduino 示例程序
 
-[下载Arduino库](https://github.com/emakefun-arduino-library/emakefun_gpio_expansion_board/archive/refs/tags/release.zip)，包含Arduino库文件和示例代码
+[下载Arduino库](https://521github.com/emakefun-arduino-library/emakefun_gpio_expansion_board/archive/refs/tags/release.zip)，包含Arduino库文件和示例代码
 
 ### Arduino 库使用文档
 
-[说明文档](https://github.com/emakefun-arduino-library/emakefun_gpio_expansion_board#gpioexpansionboard%E4%BD%BF%E7%94%A8%E6%96%87%E6%A1%A3)
+[说明文档](https://521github.com/emakefun-arduino-library/emakefun_gpio_expansion_board#gpioexpansionboard%E4%BD%BF%E7%94%A8%E6%96%87%E6%A1%A3)
 
 ### Arduino 库示例程序
 
-[示例程序](https://github.com/emakefun-arduino-library/emakefun_gpio_expansion_board#%E7%A4%BA%E4%BE%8B%E7%A8%8B%E5%BA%8F)
+[示例程序](https://521github.com/emakefun-arduino-library/emakefun_gpio_expansion_board#%E7%A4%BA%E4%BE%8B%E7%A8%8B%E5%BA%8F)
 
 ## Mixly应用场景