diff --git a/ChangeLog b/ChangeLog
index 35dda9aa55..c4e2f8c2e9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Oct 19 17:06:54 2011  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* version.h (RUBY_RELEASE_DATE): finally declare start of 2.0 work!
+
 Wed Oct 19 11:48:44 2011  Eric Hodel  <drbrain@segment7.net>
 
 	* error.c (Init_Exception):  Document $! and $@.  Provide
diff --git a/version.h b/version.h
index da726eae7f..90848619db 100644
--- a/version.h
+++ b/version.h
@@ -1,4 +1,4 @@
-#define RUBY_VERSION "1.9.4"
+#define RUBY_VERSION "2.0.0"
 #define RUBY_RELEASE_DATE "2011-10-19"
 #define RUBY_PATCHLEVEL -1
 #define RUBY_BRANCH_NAME "trunk"