diff --git a/.hgtags b/.hgtags
index d271c9bb..e3b734cf 100644
--- a/.hgtags
+++ b/.hgtags
@@ -13,3 +13,4 @@ f6b20b8853255ccbc8e3bf29fd800b5500af02ff 0.1
 0000000000000000000000000000000000000000 0.5.2
 0000000000000000000000000000000000000000 0.5.2
 e3054c016de09e211bff9324347f60afc2577c9b 0.5.2
+4cf86e688eeff00d37c5379bb6b033f2da57f4fa 0.5.2.1