diff --git a/version.h b/version.h
index 782107caa3..222d80caf2 100644
--- a/version.h
+++ b/version.h
@@ -15,8 +15,8 @@
 #define RUBY_PATCHLEVEL -1
 
 #define RUBY_RELEASE_YEAR 2021
-#define RUBY_RELEASE_MONTH 4
-#define RUBY_RELEASE_DAY 30
+#define RUBY_RELEASE_MONTH 5
+#define RUBY_RELEASE_DAY 1
 
 #include "ruby/version.h"