diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -67,3 +67,4 @@ 8841da3680fba841e5a54ebccd8ca56c078f7553
 4b0dec7fd80b1ca38e5073e5e562a5a450f73669 v4.19.3
 1485aa75ffe1b1ec48352dce7b7492d92f85e95f v4.20.0
 5b740274011766ef2f73803cc196d081e1e7f1d4 v4.20.1
+5a7835234e2c45e8fb8184c60f548a64b5842af8 v4.21.0