diff --git a/version.h b/version.h
index 3ecc626a4a..affc91ab9a 100644
--- a/version.h
+++ b/version.h
@@ -2,9 +2,9 @@
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
 #define RUBY_PATCHLEVEL -1
 
-#define RUBY_RELEASE_YEAR 2017
-#define RUBY_RELEASE_MONTH 12
-#define RUBY_RELEASE_DAY 31
+#define RUBY_RELEASE_YEAR 2018
+#define RUBY_RELEASE_MONTH 1
+#define RUBY_RELEASE_DAY 1
 
 #include "ruby/version.h"