diff --git a/.hgtags b/.hgtags
index a70181c88a..d6ee68ca91 100644
--- a/.hgtags
+++ b/.hgtags
@@ -1,2 +1,3 @@
 55ef00a248358d567eb98bf1628ad97b3159cf91 3.6.0
 486e353e3dbbc948a08a263dcf40cd66e260f71a 3.8.0
+27a9ec7db29c6ce14e73149dc86128d4ce28041d 4.0.0