diff --git a/README.md b/README.md
index 07f4ac45..8dc8374b 100644
--- a/README.md
+++ b/README.md
@@ -144,6 +144,10 @@ include the full build log for build failures.
 
 ## Version History
 
+#### 20121104
+* Add a definition for Ruby 2.0.0-preview1
+* Add a definition for Rubinius 2.0.0-rc1
+
 #### 20121022
 * Added a definition for JRuby 1.7.0
 
diff --git a/bin/ruby-build b/bin/ruby-build
index 06b31dd6..5864e132 100755
--- a/bin/ruby-build
+++ b/bin/ruby-build
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-RUBY_BUILD_VERSION="20121022"
+RUBY_BUILD_VERSION="20121104"
 
 set -E
 exec 3<&2 # preserve original stderr at fd 3
diff --git a/share/ruby-build/2.0.0-dev b/share/ruby-build/2.0.0-dev
index d459fb65..163a2c20 100644
--- a/share/ruby-build/2.0.0-dev
+++ b/share/ruby-build/2.0.0-dev
@@ -1,2 +1,2 @@
 install_package "yaml-0.1.4" "http://pyyaml.org/download/libyaml/yaml-0.1.4.tar.gz"
-install_svn "ruby-2.0.0-dev" "http://svn.ruby-lang.org/repos/ruby/trunk" "HEAD" autoconf standard
\ No newline at end of file
+install_svn "ruby-2.0.0-dev" "http://svn.ruby-lang.org/repos/ruby/trunk" "HEAD" autoconf standard