diff --git a/.hgtags b/.hgtags
index 4d38d33846..ecbcab1b9e 100644
--- a/.hgtags
+++ b/.hgtags
@@ -26,3 +26,4 @@ c43b753f2a5f6188fbe8334cac4b4746a70ddfab 5.4.0
 3ba31ca64e5c153962ae34d09f66e7060f5eb89a 6.0.0
 6413073a2177b9b5418444ef7ea0f8ebf06be6db 6.2.0
 60015c82e3561f4c67914473cd685f6ef32b60de 6.4.0
+cfc8e07becbfe951a28c774fb62ecb70e62e1f34 6.6.0