diff --git a/.hgtags b/.hgtags
index 148dd62f6e..cd9ea244ab 100644
--- a/.hgtags
+++ b/.hgtags
@@ -11,3 +11,4 @@ a9de22283047675ecc312f0a7982c9b7b848372d 3.0.0
 7726573ef30ae7f80d34a375aca5df3781def3f9 3.4.0
 31f82bca7e6371061af32bd1c42837b214da882b 3.6.0
 a205d8d04f9098dc571961336e4dade49f8bfd81 3.8.0
+5d7ebe1aab9c3e7ef539a72b54dc2e8cde94ae07 4.0.0