diff --git a/.hgtags b/.hgtags
index e6314d964a..fc15cc27f6 100644
--- a/.hgtags
+++ b/.hgtags
@@ -3,3 +3,4 @@ a299e1ffa469813b2ab7df428fbec5cd5c4e6a02 5.6.0
 a68adc6776dee3ac3eab1cb866fbdafc51759f59 5.8.0
 71ff800bfe35021ec6589840f5eb0e54246bb414 6.0.0
 b62ce70e935984ff8f07b3bea37989e40df5c548 6.2.0
+d990a954b8dee278cba42ec5d12cd8a6d838d1f3 6.4.0