diff --git a/bin/Release/README.txt b/bin/Release/README.txt
index b959dca..3e12d9b 100644
--- a/bin/Release/README.txt
+++ b/bin/Release/README.txt
@@ -2,6 +2,11 @@ NOTE:
 2.4.x versions include bison version 2.7
 2.5.x versions include bison version 3.0.x
 
+=======
+versions 2.4.12/2.5.15
+--------------
+upgrade win_bison to version 3.0.5
+
 =======
 versions 2.4.12/2.5.14
 --------------
diff --git a/bin/Release/win_flex.exe b/bin/Release/win_flex.exe
index 7680597..0e80158 100644
Binary files a/bin/Release/win_flex.exe and b/bin/Release/win_flex.exe differ