diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -39,3 +39,4 @@ f786fc4b8764cd2a5526d259cf2f94d8a66924d9
 bf1774d95bde614af3956d92b20e2a0c68c5fec7 1.6.1
 c00f03a4982e467fb6b6bd45908767db6df4771d 1.6.2
 ff5cec76b1c5b6be9c3bb923aae8c3c6d079d6b9 1.6.3
+93d8bff78c96fe7e33237b257558ee97290048a4 1.6.4