diff --git a/.hgtags b/.hgtags
index bb50a55..b1e6acb 100644
--- a/.hgtags
+++ b/.hgtags
@@ -39,3 +39,4 @@ e4c81a78ffbad6ba4d1ad119cc654da6eca63a4c 3.2
 0508a3a6ee106f36d9b8ff07bb5b28584edfa89c 3.7
 644b0798fcccd570fd519899e1601c6857496b91 3.8
 21a1ed9a69b9541a355758a57103e294fb722c33 3.9
+78f9f72cc9c6bdb022ff8908486b61ef5e242aad 4.0