diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -49,3 +49,4 @@ c7d9ad82b374c2a20710eba8fa40a9b1472ddc77
 f139e2153e0da5649558b1ed9369da860d442c0d v1.9.0-rc1
 435ce00ba2452d565f1ed3bb884643b4b88b9cde v1.9.0-rc2
 98b2c550c676ff6acf16f5bd56ee3804342f80b7 v1.9.0-rc3
+515d1b83ebdfaa93599451175055a94f711c079f v1.9.0-rc4