diff --git a/ChangeLog b/ChangeLog
index cc3298d0ed..359e42bdbf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+Tue Mar 24 16:38:14 2015  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
+
+	* spec/default.mspec: use default configuration file name.
+	  https://github.com/ruby/rubyspec/commit/cc69f337b06362e5607ffa3e3ad40ef7494960cf
+
+Tue Mar 24 16:38:14 2015  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
+
+	* spec/default.mspec: remove specific version number.
+	  https://github.com/ruby/rubyspec/commit/7a909e925c1baa9c700bd44af9241aef6e596714
+
+Tue Mar 24 16:38:14 2015  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
+
+	* common.mk: use ruby organization for rubyspec.
+
 Wed Feb 25 17:30:10 2015  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* class.c (clone_method): fixed missing assignment introduced by
diff --git a/common.mk b/common.mk
index e3df7d05d2..31b8700d2d 100644
--- a/common.mk
+++ b/common.mk
@@ -14,7 +14,7 @@ RUBYLIB       = $(PATH_SEPARATOR)
 RUBYOPT       = -
 RUN_OPTS      = --disable-gems
 
-SPEC_GIT_BASE = git://github.com/rubyspec
+SPEC_GIT_BASE = git://github.com/ruby
 MSPEC_GIT_URL = $(SPEC_GIT_BASE)/mspec.git
 RUBYSPEC_GIT_URL = $(SPEC_GIT_BASE)/rubyspec.git
 
diff --git a/spec/default.mspec b/spec/default.mspec
index c4b75f614a..e45526c7ac 100644
--- a/spec/default.mspec
+++ b/spec/default.mspec
@@ -1,4 +1,4 @@
-load File.dirname(__FILE__) + '/rubyspec/ruby.1.9.mspec'
+load File.dirname(__FILE__) + '/rubyspec/default.mspec'
 class MSpecScript
   builddir = Dir.pwd
   srcdir = ENV['SRCDIR']
diff --git a/version.h b/version.h
index a7d4f06ec2..9d00d0606d 100644
--- a/version.h
+++ b/version.h
@@ -1,10 +1,10 @@
 #define RUBY_VERSION "2.0.0"
-#define RUBY_RELEASE_DATE "2015-02-25"
-#define RUBY_PATCHLEVEL 643
+#define RUBY_RELEASE_DATE "2015-03-24"
+#define RUBY_PATCHLEVEL 644
 
 #define RUBY_RELEASE_YEAR 2015
-#define RUBY_RELEASE_MONTH 2
-#define RUBY_RELEASE_DAY 25
+#define RUBY_RELEASE_MONTH 3
+#define RUBY_RELEASE_DAY 24
 
 #include "ruby/version.h"