diff --git a/README.md b/README.md
index 6f5cef63..547f1276 100644
--- a/README.md
+++ b/README.md
@@ -561,6 +561,7 @@ A brief history description of the development progress is listed as follow:
 1. May., 2021:     FMSoft released MiniGUI version 5.0.6.
 1. Jan., 2022:     FMSoft released MiniGUI version 5.0.9.
 1. Sep., 2022:     FMSoft released MiniGUI version 5.0.10.
+1. Aug., 2023:     FMSoft released MiniGUI version 5.0.13.
 
 ## AUTHORS AND COPYING
 
diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index bdcd2e0e..f6ae912a 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -34,7 +34,7 @@
 
 ## Version 5.0.13
 
-On July 31, 2023, FMSoft announces the availability of MiniGUI 5.0.13,
+On Aug. 31, 2023, FMSoft announces the availability of MiniGUI 5.0.13,
 which is an enhancement release with some minor enhancements
 of MiniGUI 5.0.x.
 
@@ -48,6 +48,7 @@ In this version, we made some enhancements:
    - Add `BIDI_FLAG_NONE` and `BIDI_FLAG_LEGACY`.
 * BUGFIXING:
    - Ignore C0CTRL characters when renerding text.
+   - Support for vowels.
 
 ## Version 5.0.12
 
diff --git a/Version.md b/Version.md
index aa4da7b0..bdddfb20 100644
--- a/Version.md
+++ b/Version.md
@@ -1,4 +1,4 @@
-Version 5.0.14 (2023/07/31)
+Version 5.0.13 (2023/08/31)
 
 This is a minor enhancement and bugfix release of MiniGUI 5.0.x, the stable version.