diff --git a/bin/Release/win_bison.exe b/bin/Release/win_bison.exe
index 2d5dbbf..23e49be 100644
Binary files a/bin/Release/win_bison.exe and b/bin/Release/win_bison.exe differ
diff --git a/bin/Release/win_flex.exe b/bin/Release/win_flex.exe
index fb63303..3c6be4d 100644
Binary files a/bin/Release/win_flex.exe and b/bin/Release/win_flex.exe differ
diff --git a/chocolatey/tools/chocolateyInstall.ps1 b/chocolatey/tools/chocolateyInstall.ps1
index ca1f2a6..912b2d5 100644
--- a/chocolatey/tools/chocolateyInstall.ps1
+++ b/chocolatey/tools/chocolateyInstall.ps1
@@ -1,7 +1,7 @@
 # download and unpack a zip file
 Install-ChocolateyZipPackage `
   -PackageName "winflexbison" `
-  -Url "http://sourceforge.net/projects/winflexbison/files/old_versions/win_flex_bison-2.4.6.zip" `
-  -Checksum "5F55D7E3C72723A6162FE9B7613220127E3B79D4F267394B602E684B3B218306" `
+  -Url "http://sourceforge.net/projects/winflexbison/files/old_versions/win_flex_bison-2.4.7.zip" `
+  -Checksum "7553A2D6738C799E101EC38A6AD073885EAD892826F87BC1A24E78BCD7AC2A8C" `
   -ChecksumType "sha256" `
   -UnzipLocation "$(Split-Path -parent $MyInvocation.MyCommand.Definition)"
\ No newline at end of file
diff --git a/chocolatey/winflexbison.nuspec b/chocolatey/winflexbison.nuspec
index a37579a..2a91d1d 100644
--- a/chocolatey/winflexbison.nuspec
+++ b/chocolatey/winflexbison.nuspec
@@ -3,7 +3,7 @@
   <metadata>
     <id>winflexbison</id>
     <title>Win flex-bison</title>
-    <version>2.4.6.20160912</version>
+    <version>2.4.7.20170127</version>
     <authors>Alex Zhondin (in addition to original authors of flex and bison)</authors>
     <owners>lexxmark</owners>
     <summary>Win flex-bison is a port Flex/Bison tools to the Windows platform</summary>