diff --git a/.hgtags b/.hgtags
index ad07d2932b..9e0ebdd97a 100644
--- a/.hgtags
+++ b/.hgtags
@@ -13,3 +13,4 @@ f7f368317bc94c6e8812dc73e4deff9eb69e131f 2.8.0
 9755666812f662d1236df5fc32733e34bd81ca62 3.4.0
 e908e87bd83ee294fceaa222ebf2d5ca41536e01 3.6.0
 917541b1fd92be486e603a753c20d0d57ea78f32 3.8.0
+e4cc8a1d97335bfa7902fc674565866bfe68402d 4.0.0