diff --git a/CHANGELOG.md b/CHANGELOG.md
index f274b41..67d892b 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]
+## [4.0.0]
 ### Changed
 - Look-up descriptions from `@JsonClassDescription` via new `forTypesInGeneral()` API
 
@@ -16,5 +16,5 @@ BEWARE: The `forTypesInGeneral()` API was only added to the main generator libra
 - Apply alternative field names defined in `@JsonProperty` annotations.
 - Ignore fields that are deemed to be ignored according to various `jackson-annotations` (e.g. `@JsonIgnore`, `@JsonIgnoreType`, `@JsonIgnoreProperties`) or are otherwise supposed to be excluded.
 
-[Unreleased]: https://github.com/victools/jsonschema-module-jackson/compare/v3.0.0...HEAD
+[4.0.0]: https://github.com/victools/jsonschema-module-jackson/compare/v3.0.0...v4.0.0
 [3.0.0]: https://github.com/victools/jsonschema-module-jackson/releases/tag/v3.0.0
diff --git a/pom.xml b/pom.xml
index 9bbd412..516a86f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -8,7 +8,7 @@
 
     <groupId>com.github.victools</groupId>
     <artifactId>jsonschema-module-jackson</artifactId>
-    <version>4.0.0-SNAPSHOT</version>
+    <version>4.0.0</version>
     <packaging>jar</packaging>
 
     <licenses>
@@ -27,7 +27,7 @@
         <connection>scm:git:ssh://github.com/victools/jsonschema-module-jackson.git</connection>
         <developerConnection>scm:git:ssh://git@github.com/victools/jsonschema-module-jackson.git</developerConnection>
         <url>https://github.com/victools/jsonschema-module-jackson</url>
-        <tag>HEAD</tag>
+        <tag>v4.0.0</tag>
     </scm>
 
     <organization>