diff --git a/.hgtags b/.hgtags
index 10907dd035..1caa37a577 100644
--- a/.hgtags
+++ b/.hgtags
@@ -15,3 +15,4 @@ c07d75a8a08e0467abd9ab382340e942b4d8dac9 4.8.0
 bba769db59ddd0bea7a474f57982e49fa60a4d3c 5.8.0
 1a2ab8786b2d313ad49ad1d22d6dbe5f8cbee97e 6.0.0
 6b012a51e91140e582e0cd01ca862692123ed9ef 6.2.0
+91a2910dcfb4b3362cff352bdfad4cd054748377 6.4.0