diff --git a/version.h b/version.h
index 2c9631a346..40b1847c67 100644
--- a/version.h
+++ b/version.h
@@ -6,7 +6,7 @@
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 12
-#define RUBY_RELEASE_DAY 30
+#define RUBY_RELEASE_DAY 31
 
 #include "ruby/version.h"