diff --git a/readme.md b/readme.md
index 684cefd..e4dfe7d 100644
--- a/readme.md
+++ b/readme.md
@@ -3,7 +3,7 @@
 - host : [card.syui.ai](https://card.syuiai)
 
 ```sh
-$ nvm use 16
+$ nvm use 21
 $ yarn install
 $ yarn dev
 ```