diff --git a/.hgtags b/.hgtags
index a07ee306cf..b173e4e723 100644
--- a/.hgtags
+++ b/.hgtags
@@ -13,3 +13,4 @@ dd5101ebaec9f7d1d13071e0e1ffcf3958a6b0f1 1.6.0
 2a184031033ef6cd2bb53f5d754cde0a57a3014a 3.4.0
 57e860bd74aa8d46a8092b643d24b64e5fea6a51 3.6.0
 8dd80d3a8f35cb56e1013d29a4ab2509ac4ee769 3.8.0
+fb552d3041962f3ffd92cd4c2b9822351b546079 4.0.0