diff --git a/version.h b/version.h
index 5b6b8e249a..20158286e1 100644
--- a/version.h
+++ b/version.h
@@ -3,8 +3,8 @@
 #define RUBY_PATCHLEVEL -1
 
 #define RUBY_RELEASE_YEAR 2017
-#define RUBY_RELEASE_MONTH 5
-#define RUBY_RELEASE_DAY 31
+#define RUBY_RELEASE_MONTH 6
+#define RUBY_RELEASE_DAY 1
 
 #include "ruby/version.h"