diff --git a/.hgtags b/.hgtags
index b3913fff58..3916808f9a 100644
--- a/.hgtags
+++ b/.hgtags
@@ -13,3 +13,4 @@ bd2e3e6522786934ee2f1a2221b6f75cd0c94069 2.0.0
 7bdba5066b1843e26797faea13f6615dbe60567d 3.4.0
 9519497f8635fddde2b5536cb83419eca95f8e00 3.6.0
 6a1cf1542a79e0cc2685e8d82366aa802b75e13b 3.8.0
+084f54e093ddd43a51be0720137974dc2187cd96 4.0.0