diff --git a/BaseTools/Bin/Win32/build.exe b/BaseTools/Bin/Win32/build.exe
index ac13631ca0..fccf1f2b69 100755
Binary files a/BaseTools/Bin/Win32/build.exe and b/BaseTools/Bin/Win32/build.exe differ
diff --git a/BaseTools/ReadMe.txt b/BaseTools/ReadMe.txt
index f461f05be1..f79ed2fcd6 100644
--- a/BaseTools/ReadMe.txt
+++ b/BaseTools/ReadMe.txt
@@ -28,11 +28,11 @@ Notes:
 	 cannot generate AutoGen.* files. Only "build" command can.
 3) build.exe in %WORKSPACE%\BaseTools\Bin\Win32 is generated from following revision of
    Python source code:
-        r729 <buildtools_project>\BaseTools\Source\Python\Autogen
-        r729 <buildtools_project>\BaseTools\Source\Python\build
-        r729 <buildtools_project>\BaseTools\Source\Python\Common
-        r729 <buildtools_project>\BaseTools\Source\Python\CommonDataClass
-        r729 <buildtools_project>\BaseTools\Source\Python\GenFds
+        r731 <buildtools_project>\BaseTools\Source\Python\Autogen
+        r731 <buildtools_project>\BaseTools\Source\Python\build
+        r731 <buildtools_project>\BaseTools\Source\Python\Common
+        r731 <buildtools_project>\BaseTools\Source\Python\CommonDataClass
+        r731 <buildtools_project>\BaseTools\Source\Python\GenFds
         
 4) GenFds.exe has is a combo of the follow python source.(This is a temporary branch)
         r729 <buildtools_project>\BaseTools\Source\Python\Common