diff --git a/.hgtags b/.hgtags
index 2e7fd70671..ea26b49477 100644
--- a/.hgtags
+++ b/.hgtags
@@ -15,3 +15,4 @@ a15f7ba308fcb2ff1133491c843a079bf9c976f3 5.6.0
 b2b863a78064e4324237d10f17ed3001703c7c13 5.8.0
 d660bd5979030f91ff945fb68a1402e85a57e006 6.0.0
 677012ee69b8dced3cd9391374943994d3c12048 6.2.0
+2ac37bcedb1c37c0568f1f2a3f47a685edec81f1 6.4.0