diff --git a/.hgtags b/.hgtags
index 090c300462..81083d5f44 100644
--- a/.hgtags
+++ b/.hgtags
@@ -2,3 +2,4 @@
 5886452ff995b50071f07e05f519b2e4bb0526c9 3.4.0
 ed428643d547655cf08fd33ac6700bedc75308c6 3.6.0
 600f0b784df713a34b9c770622bc8dfd8a2a8c78 3.8.0
+e46734b4ac890bb0bf34bf08e261a6390fb7c3a8 4.0.0