diff --git a/.hgtags b/.hgtags
index f24427acc2..abeab1e76b 100644
--- a/.hgtags
+++ b/.hgtags
@@ -18,3 +18,4 @@ bff0c9923e8e8b659c572163ced0619d2cfd249b 5.4.0
 9bb7e13ad995e7b5b000d3f07ad59edd451701b3 5.8.0
 889d8706f279bfc2d02ce4e0cdefcefb749b1d63 6.0.0
 adb6c9bfd518d25c2708780c58e45687f5c582d9 6.2.0
+45e452fdbc086a5e840cc689e0eeb10ddf3d348b 6.4.0