diff --git a/.hgtags b/.hgtags
index 5807b229b5..6350593281 100644
--- a/.hgtags
+++ b/.hgtags
@@ -23,3 +23,4 @@ c2c208b609ac40b80a335cfec3d06e1bb55f355d 4.4.0
 a3234503fd4a938f441ed4d95248f3d62883df3b 5.8.0
 27feec86fb22e4c630a581090ebf04afab9a31cd 6.0.0
 b165d4723182f71a1bbffadf382d56f6403db1de 6.2.0
+a97ef05796d75c336c8c1b5fcdf288d9ba209be5 6.4.0