diff --git a/.hgtags b/.hgtags
index 4cff0661ee..effd7b766d 100644
--- a/.hgtags
+++ b/.hgtags
@@ -9,3 +9,4 @@ df09ae92734e945ad7b7c753d80b0013397ce1bd 5.8.0
 a8689e68bda912751c2965f83d7109e7319431aa 6.0.0
 c7f5a1246ec3e4f2a312e90b2371db2183e6880e 6.2.0
 6e7844309d9273f76872428d1167a8598cd83258 6.4.0
+78c95b533efcb566bccf3bb851ad93a2fa1f59e5 6.6.0