diff --git a/version.h b/version.h
index 92bcc64227..03db466e95 100644
--- a/version.h
+++ b/version.h
@@ -1,14 +1,14 @@
 #define RUBY_VERSION "1.9.0"
-#define RUBY_RELEASE_DATE "2004-12-30"
+#define RUBY_RELEASE_DATE "2004-12-31"
 #define RUBY_VERSION_CODE 190
-#define RUBY_RELEASE_CODE 20041230
+#define RUBY_RELEASE_CODE 20041231
 
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 9
 #define RUBY_VERSION_TEENY 0
 #define RUBY_RELEASE_YEAR 2004
 #define RUBY_RELEASE_MONTH 12
-#define RUBY_RELEASE_DAY 30
+#define RUBY_RELEASE_DAY 31
 
 RUBY_EXTERN const char ruby_version[];
 RUBY_EXTERN const char ruby_release_date[];