diff --git a/version.h b/version.h
index c6af774633..33f815461d 100644
--- a/version.h
+++ b/version.h
@@ -16,7 +16,7 @@
 
 #define RUBY_RELEASE_YEAR 2020
 #define RUBY_RELEASE_MONTH 12
-#define RUBY_RELEASE_DAY 20
+#define RUBY_RELEASE_DAY 21
 
 #include "ruby/version.h"