diff --git a/.hgtags b/.hgtags
index ba7feea1c2..86e887650d 100644
--- a/.hgtags
+++ b/.hgtags
@@ -13,3 +13,4 @@ f3e01b105d1983d8835916e46748a28f492a5aec 5.8.0
 46c0de980742bcd165e258d654df7a2b1d164f8f 6.0.0
 4db8c1cac42da1712c7ea2af1cf35e15ee4f73e0 6.2.0
 26378efb268e690f89e286eeb4277d95b1cf4eeb 6.4.0
+81cff3b0a1683ef1511877fb601ed49025854cff 6.6.0