diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6724bd12..0fd743aa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [4.21.0] - 2021-12-03
 ### `jsonschema-generator`
 #### Fixed
 - prevent mixing of `type: null` with `const`/`enum` in order to avoid validation error when `const`/`enum` does not include `null`
@@ -520,7 +520,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Indicate a number's "exclusiveMaximum" according to `@DecimalMax` or `@Negative`
 
 
-[Unreleased]: https://github.com/victools/jsonschema-generator/compare/v4.20.0...HEAD
+[4.21.0]: https://github.com/victools/jsonschema-generator/compare/v4.20.0...v4.21.0
 [4.20.0]: https://github.com/victools/jsonschema-generator/compare/v4.19.0...v4.20.0
 [4.19.0]: https://github.com/victools/jsonschema-generator/compare/v4.18.0...v4.19.0
 [4.18.0]: https://github.com/victools/jsonschema-generator/compare/v4.17.0...v4.18.0
diff --git a/README.md b/README.md
index a5b39684..1efd0df1 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ Additional documentation and configuration examples can be found here: https://v
 <dependency>
     <groupId>com.github.victools</groupId>
     <artifactId>jsonschema-generator</artifactId>
-    <version>4.20.0</version>
+    <version>4.21.0</version>
 </dependency>
 ```
 
diff --git a/jsonschema-generator/README.md b/jsonschema-generator/README.md
index 7a0e2786..ba17e88e 100644
--- a/jsonschema-generator/README.md
+++ b/jsonschema-generator/README.md
@@ -31,7 +31,7 @@ Additional documentation can be found in the [Project Wiki](https://github.com/v
 <dependency>
     <groupId>com.github.victools</groupId>
     <artifactId>jsonschema-generator</artifactId>
-    <version>[4.16.0,5.0.0)</version>
+    <version>[4.21.0,5.0.0)</version>
 </dependency>
 ```
 
diff --git a/jsonschema-generator/pom.xml b/jsonschema-generator/pom.xml
index f886c97a..5d50bf05 100644
--- a/jsonschema-generator/pom.xml
+++ b/jsonschema-generator/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>com.github.victools</groupId>
         <artifactId>jsonschema-generator-parent</artifactId>
-        <version>4.21.0-SNAPSHOT</version>
+        <version>4.21.0</version>
     </parent>
     <artifactId>jsonschema-generator</artifactId>
     
diff --git a/jsonschema-maven-plugin/README.md b/jsonschema-maven-plugin/README.md
index 60f10987..619229d0 100644
--- a/jsonschema-maven-plugin/README.md
+++ b/jsonschema-maven-plugin/README.md
@@ -188,7 +188,7 @@ It is not possible to configure options for custom modules.
         <plugin>
             <groupId>com.github.victools</groupId>
             <artifactId>jsonschema-maven-plugin</artifactId>
-            <version>[4.16.0,5.0.0)</version>
+            <version>[4.21.0,5.0.0)</version>
             <executions>
                 <execution>
                     <goals>
diff --git a/jsonschema-maven-plugin/pom.xml b/jsonschema-maven-plugin/pom.xml
index a9d7531b..601f569f 100644
--- a/jsonschema-maven-plugin/pom.xml
+++ b/jsonschema-maven-plugin/pom.xml
@@ -6,7 +6,7 @@
     <parent>
         <groupId>com.github.victools</groupId>
         <artifactId>jsonschema-generator-parent</artifactId>
-        <version>4.21.0-SNAPSHOT</version>
+        <version>4.21.0</version>
     </parent>
     <artifactId>jsonschema-maven-plugin</artifactId>
     <packaging>maven-plugin</packaging>
diff --git a/jsonschema-module-jackson/README.md b/jsonschema-module-jackson/README.md
index 7d181a12..038cffe8 100644
--- a/jsonschema-module-jackson/README.md
+++ b/jsonschema-module-jackson/README.md
@@ -37,7 +37,7 @@ Additional documentation can be found in the [Project Wiki](https://github.com/v
 <dependency>
     <groupId>com.github.victools</groupId>
     <artifactId>jsonschema-module-jackson</artifactId>
-    <version>[4.16.0,5.0.0)</version>
+    <version>[4.21.0,5.0.0)</version>
 </dependency>
 ```
 
diff --git a/jsonschema-module-jackson/pom.xml b/jsonschema-module-jackson/pom.xml
index ca1ff04d..f75390a4 100644
--- a/jsonschema-module-jackson/pom.xml
+++ b/jsonschema-module-jackson/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>com.github.victools</groupId>
         <artifactId>jsonschema-generator-parent</artifactId>
-        <version>4.21.0-SNAPSHOT</version>
+        <version>4.21.0</version>
     </parent>
     <artifactId>jsonschema-module-jackson</artifactId>
 
diff --git a/jsonschema-module-jakarta-validation/README.md b/jsonschema-module-jakarta-validation/README.md
index 8189aa3b..a4b74fa0 100644
--- a/jsonschema-module-jakarta-validation/README.md
+++ b/jsonschema-module-jakarta-validation/README.md
@@ -31,7 +31,7 @@ Additional documentation can be found in the [Project Wiki](https://github.com/v
 <dependency>
     <groupId>com.github.victools</groupId>
     <artifactId>jsonschema-module-jakarta-validation</artifactId>
-    <version>[4.17.0,5.0.0)</version>
+    <version>[4.21.0,5.0.0)</version>
 </dependency>
 ```
 
diff --git a/jsonschema-module-jakarta-validation/pom.xml b/jsonschema-module-jakarta-validation/pom.xml
index 6258b05d..e9c42f1a 100644
--- a/jsonschema-module-jakarta-validation/pom.xml
+++ b/jsonschema-module-jakarta-validation/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>com.github.victools</groupId>
         <artifactId>jsonschema-generator-parent</artifactId>
-        <version>4.21.0-SNAPSHOT</version>
+        <version>4.21.0</version>
     </parent>
     <artifactId>jsonschema-module-jakarta-validation</artifactId>
 
diff --git a/jsonschema-module-javax-validation/README.md b/jsonschema-module-javax-validation/README.md
index caf3dfa3..ec8da194 100644
--- a/jsonschema-module-javax-validation/README.md
+++ b/jsonschema-module-javax-validation/README.md
@@ -31,7 +31,7 @@ Additional documentation can be found in the [Project Wiki](https://github.com/v
 <dependency>
     <groupId>com.github.victools</groupId>
     <artifactId>jsonschema-module-javax-validation</artifactId>
-    <version>[4.16.0,5.0.0)</version>
+    <version>[4.21.0,5.0.0)</version>
 </dependency>
 ```
 
diff --git a/jsonschema-module-javax-validation/pom.xml b/jsonschema-module-javax-validation/pom.xml
index c9e2ea27..02b46c25 100644
--- a/jsonschema-module-javax-validation/pom.xml
+++ b/jsonschema-module-javax-validation/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>com.github.victools</groupId>
         <artifactId>jsonschema-generator-parent</artifactId>
-        <version>4.21.0-SNAPSHOT</version>
+        <version>4.21.0</version>
     </parent>
     <artifactId>jsonschema-module-javax-validation</artifactId>
 
diff --git a/jsonschema-module-swagger-1.5/README.md b/jsonschema-module-swagger-1.5/README.md
index 69a647bb..d05fea46 100644
--- a/jsonschema-module-swagger-1.5/README.md
+++ b/jsonschema-module-swagger-1.5/README.md
@@ -33,7 +33,7 @@ Additional documentation can be found in the [Project Wiki](https://github.com/v
 <dependency>
     <groupId>com.github.victools</groupId>
     <artifactId>jsonschema-module-swagger-1.5</artifactId>
-    <version>[4.16.0,5.0.0)</version>
+    <version>[4.21.0,5.0.0)</version>
 </dependency>
 ```
 
diff --git a/jsonschema-module-swagger-1.5/pom.xml b/jsonschema-module-swagger-1.5/pom.xml
index 59de6bd1..97f36eac 100644
--- a/jsonschema-module-swagger-1.5/pom.xml
+++ b/jsonschema-module-swagger-1.5/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>com.github.victools</groupId>
         <artifactId>jsonschema-generator-parent</artifactId>
-        <version>4.21.0-SNAPSHOT</version>
+        <version>4.21.0</version>
     </parent>
     <artifactId>jsonschema-module-swagger-1.5</artifactId>
 
diff --git a/jsonschema-module-swagger-2/README.md b/jsonschema-module-swagger-2/README.md
index 80df28fe..33eff138 100644
--- a/jsonschema-module-swagger-2/README.md
+++ b/jsonschema-module-swagger-2/README.md
@@ -55,7 +55,7 @@ Additional documentation can be found in the [Project Wiki](https://github.com/v
 <dependency>
     <groupId>com.github.victools</groupId>
     <artifactId>jsonschema-module-swagger-2</artifactId>
-    <version>[4.20.0,5.0.0)</version>
+    <version>[4.21.0,5.0.0)</version>
 </dependency>
 ```
 
diff --git a/jsonschema-module-swagger-2/pom.xml b/jsonschema-module-swagger-2/pom.xml
index 47de34a2..ed9b96be 100644
--- a/jsonschema-module-swagger-2/pom.xml
+++ b/jsonschema-module-swagger-2/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>com.github.victools</groupId>
         <artifactId>jsonschema-generator-parent</artifactId>
-        <version>4.21.0-SNAPSHOT</version>
+        <version>4.21.0</version>
     </parent>
     <artifactId>jsonschema-module-swagger-2</artifactId>
 
diff --git a/pom.xml b/pom.xml
index b063463f..c35cf48f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,7 +9,7 @@
 
     <groupId>com.github.victools</groupId>
     <artifactId>jsonschema-generator-parent</artifactId>
-    <version>4.21.0-SNAPSHOT</version>
+    <version>4.21.0</version>
     <packaging>pom</packaging>
 
     <licenses>
@@ -28,7 +28,7 @@
         <connection>scm:git:https://github.com/victools/jsonschema-generator.git</connection>
         <developerConnection>scm:git:https://github.com/victools/jsonschema-generator.git</developerConnection>
         <url>https://github.com/victools/jsonschema-generator</url>
-        <tag>HEAD</tag>
+        <tag>v4.21.0</tag>
     </scm>
 
     <organization>