diff --git a/.hgtags b/.hgtags
index d91ee1ccf5..ce3b0b9be5 100644
--- a/.hgtags
+++ b/.hgtags
@@ -12,3 +12,4 @@ ca9d55dd442d515a52a3fcfc8fc60f784ea5e906 2.8.0
 4d5fc8837f7eae07f8634d718b3ae2903b6ae60a 3.4.0
 d22c87db76f1557f048c68f6ad3ad87776b41079 3.6.0
 229754c2419cb9201649abe4a937457458a87c31 3.8.0
+d8d9d25f84964e131574d5c2af10127d5def2de1 4.0.0