diff --git a/version.h b/version.h
index 2a772d9250..0a23e40a45 100644
--- a/version.h
+++ b/version.h
@@ -4,7 +4,7 @@
 
 #define RUBY_RELEASE_YEAR 2017
 #define RUBY_RELEASE_MONTH 9
-#define RUBY_RELEASE_DAY 21
+#define RUBY_RELEASE_DAY 22
 
 #include "ruby/version.h"