diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -49,3 +49,4 @@ f2d19a1cde13d82a3803a7d73a4f9c114ed00e7e
 bb195ee1fe07d68b6fccfdde1dbe7c4dd430e15d 3.3.3
 19785af352684884f94566785ba1b13b3ddc5216 3.4.0
 757b4ada4ca121db4296b13ec0df491645db8fd0 3.5.0
+3da1a2d02072eec5419956265dcd8c7f47155c12 4.0.0