diff --git a/.hgtags b/.hgtags
index 25edd833a2..03d663ad32 100644
--- a/.hgtags
+++ b/.hgtags
@@ -13,3 +13,4 @@ a78cca850849b154bf137ef7efbb8e0fd68c7505 2.8.0
 b0df2a39dc7a1860860ded1c00cdcd864af85e4b 3.4.0
 d2f021d48dffeb15e5de20fd225ee698ee982d49 3.6.0
 b9d0f5d2accfc8b49225f6dc5431e6c0ec0b0ad0 3.8.0
+b77dc38585731d49bfd7583c74b1488dcb21a155 4.0.0