diff --git a/.hgtags b/.hgtags
index dfc0c80f73..0897eeba55 100644
--- a/.hgtags
+++ b/.hgtags
@@ -10,3 +10,4 @@ b439f3a641c3ba9003706a8dcb916daabbe72f98 5.6.0
 63947ac1f4929c7d68fb4195d507dd6718187300 5.8.0
 0fed0bd199b5697e01f20df909c0e96aae949f9a 6.0.0
 1e25eccfa7e29b51c9b91966d9ade72759abf2f5 6.2.0
+d6ffb0c1a3f893ee299e96573ebf7cca6dd60e1a 6.4.0