diff --git a/README.md b/README.md
index 9dcdf38c..049a770d 100644
--- a/README.md
+++ b/README.md
@@ -210,7 +210,7 @@ The portable version doesn't use registry but an ini file.
     - Fixed "Search" dialog.
     - Improved status message.
     - Improved modified flag handling.
-- v.5.4.1 (2020.XX.YY)
+- v.5.4.1 (2020.06.14)
     - Fixed the bug that the second overwrite save fails.
     - Fixed title bar text.
     - Fixed status bar message.
diff --git a/README.txt b/README.txt
index 79afe9dd..9b796a6a 100644
--- a/README.txt
+++ b/README.txt
@@ -206,7 +206,7 @@ Question 6. What is the difference between no installer and portable version?
     - Fixed "Search" dialog.
     - Improved status message.
     - Improved modified flag handling.
-- v.5.4.1 (2020.XX.YY)
+- v.5.4.1 (2020.06.14)
     - Fixed the bug that the second overwrite save fails.
     - Fixed title bar text.
     - Fixed status bar message.
diff --git a/READMEIT.txt b/READMEIT.txt
index 5deb2fd3..81eedbc2 100644
--- a/READMEIT.txt
+++ b/READMEIT.txt
@@ -206,7 +206,7 @@ Domanda 6. Qual è la differenza tra nessuna versione di installazione e portati
   Corretto problema testo finestra "Trova".
   Migliorati messaggi di stato (narra inferiore sinistra).
   Migliorata gestione flag.
-- v.5.4.1 (YY.XX.2020)
+- v.5.4.1 (14.06.2020)
     - Fixed the bug that the second overwrite save fails.
     - Fixed title bar text.
     - Fixed status bar message.
diff --git a/READMEJP.txt b/READMEJP.txt
index c9f0b9ce..dd3da9a8 100644
--- a/READMEJP.txt
+++ b/READMEJP.txt
@@ -518,7 +518,7 @@
         「検索」ダイアログを修正。
         状態メッセージを改良。
         変更フラグの扱いを改良。
-    v.5.4.1 (2020.XX.YY)
+    v.5.4.1 (2020.06.14)
         二回目の上書き保存で失敗する不具合を修正した。
         タイトルバーテキストを修正。
         ステータスバーメッセージを修正。