diff --git a/.hgtags b/.hgtags
index 6dc98e2340..da6377437b 100644
--- a/.hgtags
+++ b/.hgtags
@@ -8,3 +8,4 @@ fcc32914cc37205762fd0eac1b9504c84847e256 5.4.0
 e3e44fa413685ba4885a45ae03f66bf8d8a25b15 5.8.0
 f1c4cf26cd2c7d4878891466b03a332ac4ccd94f 6.0.0
 d10ef843d93b8b36fe3c9b1f11aad3b4ec940f78 6.2.0
+3a6c211e83979e0d0a8a37e3433cd00089b71809 6.4.0