diff --git a/jdk/.hgtags b/jdk/.hgtags
index 757819b39ad..4a0ac7b0f92 100644
--- a/jdk/.hgtags
+++ b/jdk/.hgtags
@@ -308,3 +308,4 @@ da84dcac1b0b12c5b836b05ac75ecbfadee0cd32 jdk9-b61
 fd3281c400347088b36aeb16273aa679d53a81a4 jdk9-b63
 7de8d036ad0980d988d1b9b4b4e6be555d9fbf98 jdk9-b64
 ed94f3e7ba6bbfec0772de6d24e39543e13f6d88 jdk9-b65
+4fbcca8ab812198c7fb747ea7b213b6e404f36e9 jdk9-b66