diff --git a/version.h b/version.h
index 3943e8fe27..43c2d4a9b9 100644
--- a/version.h
+++ b/version.h
@@ -4,7 +4,7 @@
 
 #define RUBY_RELEASE_YEAR 2017
 #define RUBY_RELEASE_MONTH 10
-#define RUBY_RELEASE_DAY 21
+#define RUBY_RELEASE_DAY 22
 
 #include "ruby/version.h"