diff --git a/.hgtags b/.hgtags
index 43d0e4f309..edc2a1152f 100644
--- a/.hgtags
+++ b/.hgtags
@@ -1,2 +1,3 @@
 abfa198d107401bf62a6e02f1e2ff6965b2b7928 3.6.0
 2ece04d8b4068388bfbc201b030806693bf2b075 3.8.0
+e2cf83872ba69aca3ba882fb6083ccf3e0b612db 4.0.0