diff --git a/.hgtags b/.hgtags
index c279fb5e7b..508fca574c 100644
--- a/.hgtags
+++ b/.hgtags
@@ -1,2 +1,3 @@
 ed754e9dc954f77a62e5c13cce8982150df6c5fc 3.6.0
 1a28a341c3b19e92faec157cd3f1daef3882c9d0 3.8.0
+caee5c8f0b7246b0f14e2cd0772959ac13a9f2c8 4.0.0