diff --git a/.hgtags b/.hgtags
index 575b2ced5a..428a9758d0 100644
--- a/.hgtags
+++ b/.hgtags
@@ -25,3 +25,4 @@ c139a716d188bf7fbf46574fa84a473133b8bee2 5.2.0
 5756606b07d016272254398e15ae07873a72c230 5.8.0
 d527c60bfe0bc723779200d118179faa7f96ba4a 6.0.0
 0a8b4ee3edc6e4e4e128884c435a47108ef30ba2 6.2.0
+e87dde891cebd2a9c913e1d4ed1884010123e740 6.4.0