diff --git a/README-en.md b/README-en.md
index 65cac9807..174427cc1 100644
--- a/README-en.md
+++ b/README-en.md
@@ -58,7 +58,7 @@ This document is formatted with Prettier.
 
 ## License
 
-ut.code(); Learn is licensed under the [MIT license](https://github.com/ut-code/utcode-learn/blob/master/LICENSE).
+ut.code(); Learn is licensed under the [MIT license](https://github.com/ut-code/utcode-learn/blob/main/LICENSE).
 Copyright © 2023 ut.code();.
 
 ## Contributing
diff --git a/README.md b/README.md
index 32a931cda..385fb2e3a 100644
--- a/README.md
+++ b/README.md
@@ -89,7 +89,7 @@ npm run build
 
 ## ライセンス
 
-ut.code(); Learn は [MIT license](https://github.com/ut-code/utcode-learn/blob/master/LICENSE) でライセンスされています。
+ut.code(); Learn は [MIT license](https://github.com/ut-code/utcode-learn/blob/main/LICENSE) でライセンスされています。
 Copyright © 2023 ut.code();.
 
 ## 貢献
diff --git a/docusaurus.config.js b/docusaurus.config.js
index dbe18463c..33007988e 100644
--- a/docusaurus.config.js
+++ b/docusaurus.config.js
@@ -45,7 +45,7 @@ const config = {
         docs: {
           showLastUpdateTime: true,
           sidebarPath: "./sidebars.js",
-          editUrl: "https://github.com/ut-code/utcode-learn/blob/master/",
+          editUrl: "https://github.com/ut-code/utcode-learn/blob/main/",
           remarkPlugins: [math],
           rehypePlugins: [katex],
         },