diff --git a/version.h b/version.h
index a192f4b124..93b24a6ec8 100644
--- a/version.h
+++ b/version.h
@@ -6,7 +6,7 @@
 
 #define RUBY_RELEASE_YEAR 2020
 #define RUBY_RELEASE_MONTH 1
-#define RUBY_RELEASE_DAY 20
+#define RUBY_RELEASE_DAY 21
 
 #include "ruby/version.h"