diff --git a/version.h b/version.h
index 3df089619d..2b2054bdf9 100644
--- a/version.h
+++ b/version.h
@@ -1,14 +1,14 @@
 #define RUBY_VERSION "1.9.1"
-#define RUBY_RELEASE_DATE "2008-12-31"
+#define RUBY_RELEASE_DATE "2009-01-01"
 #define RUBY_PATCHLEVEL 5000
 #define RUBY_BRANCH_NAME "trunk"
 
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 9
 #define RUBY_VERSION_TEENY 1
-#define RUBY_RELEASE_YEAR 2008
-#define RUBY_RELEASE_MONTH 12
-#define RUBY_RELEASE_DAY 31
+#define RUBY_RELEASE_YEAR 2009
+#define RUBY_RELEASE_MONTH 1
+#define RUBY_RELEASE_DAY 1
 
 #ifdef RUBY_EXTERN
 RUBY_EXTERN const char ruby_version[];