diff --git a/.hgtags b/.hgtags
index cea0bdbe09..b3f51414d7 100644
--- a/.hgtags
+++ b/.hgtags
@@ -11,3 +11,4 @@ fd059eb6efc541f8017126fe01244840d97e9734 1.8.0
 fcccce714c6ea6b301ccfddfcfad3ebd340ba1ab 3.4.0
 da4b0d936e33a548f38c744746fcb09d0a8d8981 3.6.0
 7ab4b6c816aac80c456cccd720f532b0f2683599 3.8.0
+32947c8017123b169ce3016d5ace19b2f3180a5c 4.0.0