diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -20,3 +20,4 @@ 7198bdec29c2872c974431d55200d0398354cdb1
 bd1c8d230fe741c2dfd7100a0ef39fd0774fd581 v4.7.2
 9731914f89765d9628dc4dddc84bc9402aa124c8 v4.8.0
 c5a2b7d0e4bbdebc4a62d7b624befe375207b659 v4.9.0
+d9aa3b27ac9f7e78359775c75fedf7bfece232f1 v4.9.1