diff --git a/.hgtags b/.hgtags
index 6b7d3cdacc..1bba455e2b 100644
--- a/.hgtags
+++ b/.hgtags
@@ -13,3 +13,4 @@ aeb255e67b8bab29d4a80a0257de8d92aaabe6e5 3.2.0
 6d886565069958d9d1a8000f728ecca34b8523fb 3.4.0
 e3b0a6ef8833a372629a4236ba5de183a52214b2 3.6.0
 d70aa7851f3c6cbe0e5474ca38f44a99671ffe26 3.8.0
+23e7c495b5019b237f60c39390c9c4e606cea244 4.0.0