diff --git a/.hgtags b/.hgtags
index 33ba0d0e20..a20b6ccd75 100644
--- a/.hgtags
+++ b/.hgtags
@@ -10,3 +10,4 @@
 414bc035b5a2c0436be216a08e7e09afe20fe1d9 6.0.0
 146d259ebef76ee3ee6f6761a6fd9e1f04cbced4 6.2.0
 c5f2150b8d145b5c933158531e35788889e8bbb6 6.4.0
+f2ab28f04fc78d4ed4fb968259f92932680a4669 6.6.0