diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -20,3 +20,4 @@ 57f527e0646d731768fb5e0fe742b12a35bdc63b
 f9b09787da9845e4a105f4bffdc252099902cefb v4.7.2
 0b7c790b726f08385e6ebdf4f257c905787b9244 v4.8.0
 f4123e725b74d0e82fe89982ab8791a66062e2b3 v4.9.0
+940bac044a0fe1ec839759df81399b50141be720 v4.9.1