diff --git a/.hgtags b/.hgtags
index fdaa6f8cb0..d64ab4c9c0 100644
--- a/.hgtags
+++ b/.hgtags
@@ -6,3 +6,4 @@ d78fac53046d868f11c8d42f0baff6a0a16497bf 5.2.0
 a7c5dedf708211de95b5d6f18be8fe2a40b01477 5.8.0
 b3e615c084feedfd747423c775eb55300824804e 6.0.0
 aead29923a0444b44ca13ac0261081c5fdebdf86 6.2.0
+6c687b0522c7b41e9d159b8245a8b08a1aac0951 6.4.0