prepare RC1 of Commons Compress 1.21
diff --git a/NOTICE.txt b/NOTICE.txt
index 132b089..3fb4707 100644
--- a/NOTICE.txt
+++ b/NOTICE.txt
@@ -1,5 +1,5 @@
 Apache Commons Compress
-Copyright 2002-2020 The Apache Software Foundation
+Copyright 2002-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (https://www.apache.org/).
diff --git a/README.md b/README.md
index 89ca9b4..8db17e9 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@
 [![Build Status](https://travis-ci.org/apache/commons-compress.svg)](https://travis-ci.org/apache/commons-compress)
 [![Coverage Status](https://coveralls.io/repos/apache/commons-compress/badge.svg)](https://coveralls.io/r/apache/commons-compress)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.apache.commons/commons-compress/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.apache.commons/commons-compress/)
-[![Javadocs](https://javadoc.io/badge/org.apache.commons/commons-compress/1.20.svg)](https://javadoc.io/doc/org.apache.commons/commons-compress/1.20)
+[![Javadocs](https://javadoc.io/badge/org.apache.commons/commons-compress/1.21.svg)](https://javadoc.io/doc/org.apache.commons/commons-compress/1.21)
 [![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/apache-commons.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:apache-commons)
 
 **Note: Commons Compress currently doesn't build on JDK 14+, we will
@@ -74,7 +74,7 @@
 <dependency>
   <groupId>org.apache.commons</groupId>
   <artifactId>commons-compress</artifactId>
-  <version>1.20</version>
+  <version>1.21</version>
 </dependency>
 ```
 
diff --git a/pom.xml b/pom.xml
index 2fa43c5..757312c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -24,7 +24,7 @@
   </parent>
 
   <artifactId>commons-compress</artifactId>
-  <version>1.21-SNAPSHOT</version>
+  <version>1.21</version>
   <name>Apache Commons Compress</name>
   <url>https://commons.apache.org/proper/commons-compress/</url>
   <inceptionYear>2002</inceptionYear> <!-- from NOTICE file -->
diff --git a/src/site/site.xml b/src/site/site.xml
index e96859f..d76013b 100644
--- a/src/site/site.xml
+++ b/src/site/site.xml
@@ -38,6 +38,7 @@
     </menu>
     <menu name="API Docs">
       <item name="Latest release" href="javadocs/api-release/index.html"/>
+      <item name="1.21" href="javadocs/api-1.21/index.html"/>
       <item name="1.20" href="javadocs/api-1.20/index.html"/>
       <item name="1.19" href="javadocs/api-1.19/index.html"/>
       <item name="1.18" href="javadocs/api-1.18/index.html"/>
diff --git a/src/site/xdoc/download_compress.xml b/src/site/xdoc/download_compress.xml
index aeb7043..67d7cf8 100644
--- a/src/site/xdoc/download_compress.xml
+++ b/src/site/xdoc/download_compress.xml
@@ -113,32 +113,32 @@
       </p>
     </subsection>
     </section>
-    <section name="Apache Commons Compress 1.20 ">
+    <section name="Apache Commons Compress 1.21 ">
       <subsection name="Binaries">
         <table>
           <tr>
-              <td><a href="[preferred]/commons/compress/binaries/commons-compress-1.20-bin.tar.gz">commons-compress-1.20-bin.tar.gz</a></td>
-              <td><a href="https://www.apache.org/dist/commons/compress/binaries/commons-compress-1.20-bin.tar.gz.sha512">sha512</a></td>
-              <td><a href="https://www.apache.org/dist/commons/compress/binaries/commons-compress-1.20-bin.tar.gz.asc">pgp</a></td>
+              <td><a href="[preferred]/commons/compress/binaries/commons-compress-1.21-bin.tar.gz">commons-compress-1.21-bin.tar.gz</a></td>
+              <td><a href="https://www.apache.org/dist/commons/compress/binaries/commons-compress-1.21-bin.tar.gz.sha512">sha512</a></td>
+              <td><a href="https://www.apache.org/dist/commons/compress/binaries/commons-compress-1.21-bin.tar.gz.asc">pgp</a></td>
           </tr>
           <tr>
-              <td><a href="[preferred]/commons/compress/binaries/commons-compress-1.20-bin.zip">commons-compress-1.20-bin.zip</a></td>
-              <td><a href="https://www.apache.org/dist/commons/compress/binaries/commons-compress-1.20-bin.zip.sha512">sha512</a></td>
-              <td><a href="https://www.apache.org/dist/commons/compress/binaries/commons-compress-1.20-bin.zip.asc">pgp</a></td>
+              <td><a href="[preferred]/commons/compress/binaries/commons-compress-1.21-bin.zip">commons-compress-1.21-bin.zip</a></td>
+              <td><a href="https://www.apache.org/dist/commons/compress/binaries/commons-compress-1.21-bin.zip.sha512">sha512</a></td>
+              <td><a href="https://www.apache.org/dist/commons/compress/binaries/commons-compress-1.21-bin.zip.asc">pgp</a></td>
           </tr>
         </table>
       </subsection>
       <subsection name="Source">
         <table>
           <tr>
-              <td><a href="[preferred]/commons/compress/source/commons-compress-1.20-src.tar.gz">commons-compress-1.20-src.tar.gz</a></td>
-              <td><a href="https://www.apache.org/dist/commons/compress/source/commons-compress-1.20-src.tar.gz.sha512">sha512</a></td>
-              <td><a href="https://www.apache.org/dist/commons/compress/source/commons-compress-1.20-src.tar.gz.asc">pgp</a></td>
+              <td><a href="[preferred]/commons/compress/source/commons-compress-1.21-src.tar.gz">commons-compress-1.21-src.tar.gz</a></td>
+              <td><a href="https://www.apache.org/dist/commons/compress/source/commons-compress-1.21-src.tar.gz.sha512">sha512</a></td>
+              <td><a href="https://www.apache.org/dist/commons/compress/source/commons-compress-1.21-src.tar.gz.asc">pgp</a></td>
           </tr>
           <tr>
-              <td><a href="[preferred]/commons/compress/source/commons-compress-1.20-src.zip">commons-compress-1.20-src.zip</a></td>
-              <td><a href="https://www.apache.org/dist/commons/compress/source/commons-compress-1.20-src.zip.sha512">sha512</a></td>
-              <td><a href="https://www.apache.org/dist/commons/compress/source/commons-compress-1.20-src.zip.asc">pgp</a></td>
+              <td><a href="[preferred]/commons/compress/source/commons-compress-1.21-src.zip">commons-compress-1.21-src.zip</a></td>
+              <td><a href="https://www.apache.org/dist/commons/compress/source/commons-compress-1.21-src.zip.sha512">sha512</a></td>
+              <td><a href="https://www.apache.org/dist/commons/compress/source/commons-compress-1.21-src.zip.asc">pgp</a></td>
           </tr>
         </table>
       </subsection>