diff --git a/.hgtags b/.hgtags
index 2647274..1c0172d 100644
--- a/.hgtags
+++ b/.hgtags
@@ -19,3 +19,4 @@
 31ff3e943e1675a2caf745ba7a981244445d4c98 release-0.1.18
 45a460f82aec80b0f61136aa09f412436d42203a release-0.1.19
 0f836f0288eee4980f57736d50a7a60fa082d8e9 release-0.1.20
+975f62e77f0244f1b631f740be77c72c8f2da1de release-0.1.21