diff --git a/ext/kindlegen/extconf.rb b/ext/kindlegen/extconf.rb
index 2a6699e..d0098ab 100644
--- a/ext/kindlegen/extconf.rb
+++ b/ext/kindlegen/extconf.rb
@@ -5,8 +5,8 @@
 require 'rbconfig'
 File::open('Makefile', 'w') do |w|
   tarball = case RbConfig::CONFIG['host_os']
-  when /mac|darwin/i then "KindleGen_Mac_i386_v2.zip"
-  when /linux|cygwin/i then "kindlegen_linux_2.6_i386_v2.tar.gz"
+  when /mac|darwin/i then "KindleGen_Mac_i386_v2_4.zip"
+  when /linux|cygwin/i then "kindlegen_linux_2.6_i386_v2_4.tar.gz"
   else
     STDERR.puts "Host OS unsupported!"
     exit(1)
diff --git a/lib/kindlegen/version.rb b/lib/kindlegen/version.rb
index 53dc765..7280837 100644
--- a/lib/kindlegen/version.rb
+++ b/lib/kindlegen/version.rb
@@ -1,3 +1,3 @@
 module Kindlegen
-  VERSION = "2.3.1"
+  VERSION = "2.4.0"
 end