diff --git a/.hgtags b/.hgtags
index 9e0d53f..9f97c28 100644
--- a/.hgtags
+++ b/.hgtags
@@ -22,3 +22,4 @@ b8c5b2605d9ebe3062af64ed42523433fc90ca57 1.6.3
 05777cc83dfd32383cb9330161e058186ee24150 1.6.1
 4f4444ad82c6b916864c861f1eff3d480abf9741 1.6.6
 b031cf96c5ece10ff6b37c809dcfd61d04e84d9c 1.6.7
+a18276ee33f3574ae050583d073858718ac6df39 1.6.4