diff --git a/.hgtags b/.hgtags
index b0ef60c6a5..f7508f2292 100644
--- a/.hgtags
+++ b/.hgtags
@@ -2,3 +2,4 @@
 115246f380002cee64faceb5ef2bfa18633808eb 5.8.0
 60b1d8f3d17a319a5cfec219a1d423e1d872b984 6.0.0
 8e9cf003f13e9ddddabc7f7aee80b09af44561e7 6.2.0
+acd3c908d831c1d6796572362d6abc82b3f80abf 6.4.0