diff --git a/.hgtags b/.hgtags
index 84da944320..4a1a70da32 100644
--- a/.hgtags
+++ b/.hgtags
@@ -4,3 +4,4 @@ baa4f9226891f0ad4cecf60d2a6b00c0b6a700ef 5.6.0
 cae361418096a0e678e1710eadbdf22829ddd80b 5.8.0
 9607c76798c9d4a1edf1e960e751635a8a6c8856 6.0.0
 aeb2fa2f5d7da0d85fbaa7a43603f63ced05d0e2 6.2.0
+f066b90a2f2e455dd9deffb48786ad300e965fcc 6.4.0