diff --git a/README.rst b/README.rst
index 12e12235..ace7d152 100644
--- a/README.rst
+++ b/README.rst
@@ -127,7 +127,7 @@ and then include the GeoScript Groovy dependency::
     <dependency>
         <groupId>org.geoscript</groupId>
         <artifactId>geoscript-groovy</artifactId>
-        <version>1.20.0</version>
+        <version>1.21.0</version>
     </dependency>
 
 Docker
@@ -199,6 +199,8 @@ Versions
 API Groovy Docs
 ---------------
 
+`1.21.0 <http://geoscript.github.io/geoscript-groovy/api/1.21.0/index.html>`_
+
 `1.20.0 <http://geoscript.github.io/geoscript-groovy/api/1.20.0/index.html>`_
 
 `1.19.0 <http://geoscript.github.io/geoscript-groovy/api/1.19.0/index.html>`_
diff --git a/doc/conf.py b/doc/conf.py
index 050be9e0..b231539e 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -45,9 +45,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '1.17.0'
+version = '1.21.0'
 # The full version, including alpha/beta/rc tags.
-release = '1.17.0'
+release = '1.21.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/doc/docs.rst b/doc/docs.rst
index e26741b4..4cf27309 100644
--- a/doc/docs.rst
+++ b/doc/docs.rst
@@ -8,6 +8,16 @@ Cookbook
 API Docs
 ========
 
+`1.21.0 <http://geoscript.github.io/geoscript-groovy/api/1.21.0/index.html>`_
+
+`1.20.0 <http://geoscript.github.io/geoscript-groovy/api/1.20.0/index.html>`_
+
+`1.19.0 <http://geoscript.github.io/geoscript-groovy/api/1.19.0/index.html>`_
+
+`1.18.0 <http://geoscript.github.io/geoscript-groovy/api/1.18.0/index.html>`_
+
+`1.17.0 <http://geoscript.github.io/geoscript-groovy/api/1.17.0/index.html>`_
+
 `1.16.0 <http://geoscript.github.io/geoscript-groovy/api/1.16.0/index.html>`_
 
 `1.15.0 <http://geoscript.github.io/geoscript-groovy/api/1.15.0/index.html>`_
diff --git a/doc/gradle.rst b/doc/gradle.rst
index b7078712..68f2f662 100644
--- a/doc/gradle.rst
+++ b/doc/gradle.rst
@@ -51,7 +51,7 @@ Then edit the build.gradle file.
     }
 
     dependencies {
-       compile "org.geoscript:geoscript-groovy:1.20.0"
+       compile "org.geoscript:geoscript-groovy:1.21.0"
     }
 
     task wrapper(type: Wrapper) {
diff --git a/doc/mavenapp.rst b/doc/mavenapp.rst
index df5b7cd4..f71d93a6 100644
--- a/doc/mavenapp.rst
+++ b/doc/mavenapp.rst
@@ -31,7 +31,7 @@ Add geoscript as a dependency in pom.xml.
         <dependency>
             <groupId>org.geoscript</groupId>
             <artifactId>geoscript-groovy</artifactId>
-            <version>1.20.0</version>
+            <version>1.21.0</version>
         </dependency>
     </dependencies>
 
diff --git a/doc/mavenwebappjndi.rst b/doc/mavenwebappjndi.rst
index 13b642fa..6f8c4f96 100644
--- a/doc/mavenwebappjndi.rst
+++ b/doc/mavenwebappjndi.rst
@@ -42,7 +42,7 @@ Add geoscript as a dependency in the **pom.xml** file:
         <dependency>
             <groupId>org.geoscript</groupId>
             <artifactId>geoscript-groovy</artifactId>
-            <version>1.20.0</version>
+            <version>1.21.0</version>
         </dependency>
     <depenencies>
 
diff --git a/doc/quickstart.rst b/doc/quickstart.rst
index a7655f85..def9a86c 100644
--- a/doc/quickstart.rst
+++ b/doc/quickstart.rst
@@ -33,9 +33,9 @@ Install GeoScript
 
 #. Unpack the GeoScript tarball::
 
-     unzip geoscript-groovy-1.15.0.zip
+     unzip geoscript-groovy-1.21.0.zip
 
-#. Add the geoscript-groovy-1.15.0/bin directory to your path::
+#. Add the geoscript-groovy-1.21.0/bin directory to your path::
 
      export PATH=$(cd bin; pwd):$PATH
 
diff --git a/doc/releases.rst b/doc/releases.rst
index fd01c89b..5a6d89d1 100644
--- a/doc/releases.rst
+++ b/doc/releases.rst
@@ -3,6 +3,10 @@
 GeoScript Groovy Releases
 =========================
 
+1.21.0
+------
+The 1.21 release of GeoScript is build on Groovy 4.0.13, GeoTools 29.0, and the Java Topology Suite 1.90.0 and requires Java 8.
+
 1.20.0
 ------
 The 1.20 release of GeoScript is build on Groovy 3.0.13, GeoTools 28.0, and the Java Topology Suite 1.90.0 and requires Java 8.
diff --git a/pom.xml b/pom.xml
index a0689ec9..39aa3eec 100755
--- a/pom.xml
+++ b/pom.xml
@@ -8,9 +8,9 @@
     <groupId>org.geoscript</groupId>
     <artifactId>geoscript-groovy</artifactId>
     <packaging>jar</packaging>
-    <version>1.21.0-SNAPSHOT</version>
+    <version>1.21.0</version>
     <properties>
-        <gt.version>29-SNAPSHOT</gt.version>
+        <gt.version>29.2</gt.version>
         <jts.version>1.19.0</jts.version>
         <groovy.version>4.0.13</groovy.version>
     </properties>