diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -68,3 +68,4 @@ 7ac623a4a2405917e2af660d645ded662011e40d
 ef7ffda65eeb90c3ba88590a6cb816ef9b0bc232 v4.19.3
 3e635489bb7961df93b01e42454ad1a8730ae968 v4.20.0
 7e2eb896a02ca7cd2cd9f0f853ef3dac3f0039e3 v4.20.1
+8bb5fece08ab65986225b184e46f53d2a71729cb v4.21.0