diff --git a/.hgtags b/.hgtags
index 2db1e18f34..e46f4e0a02 100644
--- a/.hgtags
+++ b/.hgtags
@@ -25,3 +25,4 @@ c33b1c4ded6131bc1daa8d0c39776a2735dfaf43 5.6.0
 065639f5b7ce76959f045761b364ef07d3ee1214 5.8.0
 85c9e817c85c86aca2f2f495e6dc5a72a5de6ff4 6.0.0
 a867bf62f280de5a07eab7b6ab1d63a8422ab162 6.2.0
+3f9efba89d1e199324c2dfe3a3b0b239d1769e4b 6.4.0