diff --git a/.hgtags b/.hgtags
index af7bb7ba05..e90019cc93 100644
--- a/.hgtags
+++ b/.hgtags
@@ -26,3 +26,4 @@ dd281f1f559852432d3490c6e377cca049b1e70e 5.8.0
 03c59ac61fa475a5e6a543fad8009f5aa0c48805 6.0.0
 3438169feb6ef1eeca3add53d5f23a58ff924228 6.2.0
 59c3e76f3f30f617bdcec86292a3b05d9279c280 6.4.0
+df717c0ac604fad12f507c0bb4e6bee337a151e3 6.6.0