diff --git a/.hgtags b/.hgtags
index c53d2c270f..84dd78ec98 100644
--- a/.hgtags
+++ b/.hgtags
@@ -2,3 +2,4 @@
 ae5ce12311dc9eeeadc48e8d9502a7024b49583d 3.4.0
 8da29982ce00606b18099b4f69bcefebaaa93092 3.6.0
 b0686a56cc335f348ca3ff906bc198b7ad407cbe 3.8.0
+e07b1b5cd0cb478d576324ed77678058c73a1964 4.0.0