diff --git a/.hgtags b/.hgtags
index 086ce01bd8..c1124510c7 100644
--- a/.hgtags
+++ b/.hgtags
@@ -11,3 +11,4 @@ a32068d131a6872da6c87812f3fda96c5ad076bb 1.4.0
 a4e84c96f4735bd710e02a0364af0947ba44d4b7 3.4.0
 728c1ee800a32fdd4856e86998a32c3c929d262d 3.6.0
 1924468dda905272353c147edc625a3496b3421e 3.8.0
+ae80ff03e20174f8ed595b9fa47893598c13f91f 4.0.0