diff --git a/2-js-basics/1-data-types/translations/README.ja.md b/2-js-basics/1-data-types/translations/README.ja.md
index 9892d509..e8a780ec 100644
--- a/2-js-basics/1-data-types/translations/README.ja.md
+++ b/2-js-basics/1-data-types/translations/README.ja.md
@@ -193,4 +193,4 @@ JavaScript は、たまにデータ型を扱う際の意外な方法で悪名高
 
 ## 課題
 
-[データ型の練習](assignment.md)
+[データ型の練習](assignment.ja.md)
diff --git a/2-js-basics/2-functions-methods/translations/README.ja.md b/2-js-basics/2-functions-methods/translations/README.ja.md
index 799da35a..0b6adb53 100644
--- a/2-js-basics/2-functions-methods/translations/README.ja.md
+++ b/2-js-basics/2-functions-methods/translations/README.ja.md
@@ -189,4 +189,4 @@ setTimeout(() => {
 
 ## 課題
 
-[関数で楽しむ](assignment.md)
\ No newline at end of file
+[関数で楽しむ](assignment.ja.md)
\ No newline at end of file
diff --git a/2-js-basics/3-making-decisions/translations/README.ja.md b/2-js-basics/3-making-decisions/translations/README.ja.md
index 9d9ca671..7a836262 100644
--- a/2-js-basics/3-making-decisions/translations/README.ja.md
+++ b/2-js-basics/3-making-decisions/translations/README.ja.md
@@ -172,4 +172,4 @@ Josh Comeau の素晴らしい [operator lookup](https://joshwcomeau.com/operato
 
 ## 課題
 
-[演算子](assignment.md)
+[演算子](assignment.ja.md)
diff --git a/2-js-basics/4-arrays-loops/translations/README.ja.md b/2-js-basics/4-arrays-loops/translations/README.ja.md
index 2b378ca4..b62e12b6 100644
--- a/2-js-basics/4-arrays-loops/translations/README.ja.md
+++ b/2-js-basics/4-arrays-loops/translations/README.ja.md
@@ -121,4 +121,4 @@ JavaScript の配列には多くのメソッドがあり、データ操作に非
 
 ## 課題
 
-[配列のループ](assignment.md)
+[配列のループ](assignment.ja.md)