diff --git a/.hgtags b/.hgtags
index 094d3cd02b..fddc7f14b8 100644
--- a/.hgtags
+++ b/.hgtags
@@ -11,3 +11,4 @@ d955af19827236bea2331558dfab15df8556c64a 3.2.0
 7bfee22bbf9a7a17023744f7d1ee5eb5dacba1a5 3.4.0
 8660766e841e339e00dd0c969bc0103893343a03 3.6.0
 521de1ede00003b7d7cfd0c7afaa7bc4ad123f76 3.8.0
+1868494cc12081a492f0d98f5fc2a58a17c88dce 4.0.0