diff --git a/.hgtags b/.hgtags
index 618eae16f9..2d68a96322 100644
--- a/.hgtags
+++ b/.hgtags
@@ -21,3 +21,4 @@ e5eec71f9a0d2721c20ad4a7e5cb63284852f7b8 5.6.0
 cbd064ab4c8be015212520cd89eed5bc4226ef0e 5.8.0
 4dceb29202840bc30fbd64d9ba0f8c2bb35d595c 6.0.0
 aefd2720c9a9f16e5c41353cd1c56a2dc3e9e8fb 6.2.0
+3ef207d3dcc4357041196b49d673731fffa1ad01 6.4.0