diff --git a/Day01/README.md b/Day01/README.md
index f5af80e..1da6df5 100644
--- a/Day01/README.md
+++ b/Day01/README.md
@@ -32,4 +32,4 @@
 ## 參考資料
 [typescriptlang.org](https://www.typescriptlang.org/)
 
-[TypeScript 特色與歷史簡介](https://oomusou.io/typescript/intro/)
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+[TypeScript 特色與歷史簡介](https://old-oomusou.goodjack.tw/typescript/intro/)
\ No newline at end of file
diff --git a/Day02/README.md b/Day02/README.md
index f39c519..8fc9969 100644
--- a/Day02/README.md
+++ b/Day02/README.md
@@ -176,7 +176,7 @@ let strLength: number = (someValue as string).length;
 ### Let 
 官方文件聲明Let使用的時機會多大於var，原因是因為var無scope概念，也關乎於生命週期的原因，這偏不多做說明。
 
-[深入探討 TypeScript 之變數宣告與建立](https://oomusou.io/typescript/variable/)
+[深入探討 TypeScript 之變數宣告與建立](https://old-oomusou.goodjack.tw/typescript/variable/)
 [JavaScript variables lifecycle: why let is not hoisted](https://dmitripavlutin.com/variables-lifecycle-and-why-let-is-not-hoisted/)
 
 ---
diff --git a/Day05/README.md b/Day05/README.md
index d970314..d106ca2 100644
--- a/Day05/README.md
+++ b/Day05/README.md
@@ -156,6 +156,6 @@ class Location {
 
 
 #### 參考資料
-[深入探討 TypeScript 之 Interface](https://oomusou.io/typescript/interface/)
+[深入探討 TypeScript 之 Interface](https://old-oomusou.goodjack.tw/typescript/interface/)
 [TypeScript HandBook](https://www.typescriptlang.org/docs/handbook/interfaces.html)
 
diff --git a/Day06/README.md b/Day06/README.md
index 36f927c..243c054 100644
--- a/Day06/README.md
+++ b/Day06/README.md
@@ -108,5 +108,5 @@ const numLivesForCat = 9;
 ### 參考資料
 
 [mozilla.org](https://developer.mozilla.org/zh-TW/docs/Glossary/Hoisting)
-[深入探討 TypeScript 之變數宣告與建立](https://oomusou.io/typescript/variable/)
+[深入探討 TypeScript 之變數宣告與建立](https://old-oomusou.goodjack.tw/typescript/variable/)
 [TypeScript Handbook](https://www.typescriptlang.org/docs/handbook/variable-declarations.html)
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