diff --git a/version.h b/version.h
index fb87f44de9..f90b413a11 100644
--- a/version.h
+++ b/version.h
@@ -1,4 +1,4 @@
 #define RUBY_VERSION "1.6.4"
-#define RUBY_RELEASE_DATE "2001-04-17"
+#define RUBY_RELEASE_DATE "2001-04-18"
 #define RUBY_VERSION_CODE 164
-#define RUBY_RELEASE_CODE 20010417
+#define RUBY_RELEASE_CODE 20010418