diff --git a/.hgtags b/.hgtags
index 5e990916bd..dedcd1f593 100644
--- a/.hgtags
+++ b/.hgtags
@@ -9,3 +9,4 @@ b95009d0a58dd058440cc0cd7537e5c4499ea16a 5.6.0
 166c1e4c476baeb36b21cef7963b87b5ca07f71e 5.8.0
 ec9a4f3e26f796c12a267e4b3af717fd2a35c066 6.0.0
 355cdcd27f958fbd7e3bdd021c238283b3f0f539 6.2.0
+b81b890c871cea5a9a3fb734af72452f59969c32 6.4.0