diff --git a/gradle.properties b/gradle.properties
index 22ce4ed..3fac654 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -23,7 +23,7 @@
 # This is version for Calcite Avatica itself
 # Note: it should not include "-SNAPSHOT" as it is automatically added by build.gradle.kts
 # Release version can be generated by using -Prelease or -Prc=<int> arguments
-calcite.avatica.version=1.20.0
+calcite.avatica.version=1.21.0
 
 # The options below configures the use of local clone (e.g. testing development versions)
 # You can pass un-comment it, or pass option -PlocalReleasePlugins, or -PlocalReleasePlugins=<path>
diff --git a/site/_posts/2021-12-13-release-1.20.0.md b/site/_posts/2021-12-13-release-1.20.0.md
new file mode 100644
index 0000000..a40175b
--- /dev/null
+++ b/site/_posts/2021-12-13-release-1.20.0.md
@@ -0,0 +1,38 @@
+---
+layout: news_item
+date: "2021-12-13 08:30:00 +0000"
+author: jhyde
+version: 1.20.0
+categories: [release]
+tag: v1-20-0
+sha: 8f83775
+component: avatica
+---
+<!--
+{% comment %}
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to you under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License.  You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+{% endcomment %}
+-->
+
+Apache Calcite Avatica 1.20.0
+<a href="https://issues.apache.org/jira/browse/CALCITE-4931">upgrades Log4j2 to version 2.15.0</a>
+to address
+<a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-44228">CVE-2021-44228</a>,
+and makes the SPNEGO protocol
+<a href="https://issues.apache.org/jira/browse/CALCITE-4152">much more efficient</a>.
+See the list of
+[bug fixes and new features]({{ site.baseurl }}/docs/history.html#v1-20-0)
+for more information.