diff --git a/.hgtags b/.hgtags
index 77d6ef5386..0645983565 100644
--- a/.hgtags
+++ b/.hgtags
@@ -11,3 +11,4 @@ a830f1857625b8fb49a6af6b743752df243af71f 3.0.0
 5fbd051c10fa6c711757bfbc174da3747ffe129d 3.4.0
 7b197bcef4e02ef8a68dc17f186e174e20d3b2fe 3.6.0
 d78477a6a67ff6a28fedf469a43d0037470588ef 3.8.0
+784020eb59ca903b02f0ad66ea26d0507509e7d0 4.0.0