diff --git a/.hgtags b/.hgtags
index d3e0b6128b..605b45fcc0 100644
--- a/.hgtags
+++ b/.hgtags
@@ -6,3 +6,4 @@ fb5d9bead5daa2058a5d59f3ef18de584202b4d6 5.6.0
 cc2dd321d99fe14fe9251051eee46a6903c57bc4 6.0.0
 1b88c1efab8e6d8c128b0eed0395603ccb2d1ffd 6.2.0
 e5d8ffaf91c7afd4f809b0bc441827edc8673dda 6.4.0
+3b990739f8071bb9bcc46bfb5f45a2f71532f296 6.6.0