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+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0. If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+Notes for BIND 9.18.21
+----------------------
+
+Removed Features
+~~~~~~~~~~~~~~~~
+
+- Support for using AES as the DNS COOKIE algorithm (``cookie-algorithm
+ aes;``) has been deprecated and will be removed in a future release.
+ Please use the current default, SipHash-2-4, instead. :gl:`#4421`
+
+- The :any:`resolver-nonbackoff-tries` and :any:`resolver-retry-interval`
+ statements have been deprecated. Using them now causes a warning to be
+ logged. :gl:`#4405`
+
+Known Issues
+~~~~~~~~~~~~
+
+- There are no new known issues with this release. See :ref:`above
+ <relnotes_known_issues>` for a list of all known issues affecting this
+ BIND 9 branch.