diff --git a/CHANGELOG.md b/CHANGELOG.md
index a765cca2..21a0763d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+
+## [21.3.1] - 2024-03-26
 ### Fixed
 - Correct repo URL in `package.json`
 
@@ -313,7 +315,8 @@ even if there were no errors.
 ### Added
 - First release
 
-[Unreleased]: https://github.com/cucumber/html-formatter/compare/v21.3.0...HEAD
+[Unreleased]: https://github.com/cucumber/html-formatter/compare/v21.3.1...HEAD
+[21.3.1]: https://github.com/cucumber/html-formatter/compare/v21.3.0...v21.3.1
 [21.3.0]: https://github.com/cucumber/html-formatter/compare/v21.2.0...v21.3.0
 [21.2.0]: https://github.com/cucumber/html-formatter/compare/v21.1.0...v21.2.0
 [21.1.0]: https://github.com/cucumber/html-formatter/compare/v21.0.0...v21.1.0
diff --git a/java/pom.xml b/java/pom.xml
index 781eff22..aaa49915 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -9,7 +9,7 @@
     </parent>
 
     <artifactId>html-formatter</artifactId>
-    <version>21.3.1-SNAPSHOT</version>
+    <version>21.3.1</version>
     <packaging>jar</packaging>
     <name>Cucumber HTML Formatter</name>
     <description>Renders Cucumber Messages as HTML</description>
@@ -17,14 +17,14 @@
 
     <properties>
         <project.Automatic-Module-Name>io.cucumber.htmlformatter</project.Automatic-Module-Name>
-        <project.build.outputTimestamp>1710516009</project.build.outputTimestamp>
+        <project.build.outputTimestamp>1711443301</project.build.outputTimestamp>
     </properties>
 
     <scm>
         <connection>scm:git:git://github.com/cucumber/html-formatter.git</connection>
         <developerConnection>scm:git:git@github.com:cucumber/html-formatter.git</developerConnection>
         <url>git://github.com/cucumber/html-formatter.git</url>
-        <tag>HEAD</tag>
+        <tag>v21.3.1</tag>
     </scm>
 
     <dependencyManagement>
diff --git a/javascript/package-lock.json b/javascript/package-lock.json
index 0ecf9dd3..e9e8ae60 100644
--- a/javascript/package-lock.json
+++ b/javascript/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@cucumber/html-formatter",
-  "version": "21.3.0",
+  "version": "21.3.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@cucumber/html-formatter",
-      "version": "21.3.0",
+      "version": "21.3.1",
       "license": "MIT",
       "devDependencies": {
         "@babel/core": "7.24.3",
diff --git a/javascript/package.json b/javascript/package.json
index 9c87a34b..c57da361 100644
--- a/javascript/package.json
+++ b/javascript/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@cucumber/html-formatter",
-  "version": "21.3.0",
+  "version": "21.3.1",
   "description": "HTML formatter for Cucumber",
   "main": "dist/src/CucumberHtmlStream.js",
   "types": "dist/src/CucumberHtmlStream.d.ts",
diff --git a/ruby/VERSION b/ruby/VERSION
index 54d3ad73..0fac3b01 100644
--- a/ruby/VERSION
+++ b/ruby/VERSION
@@ -1 +1 @@
-21.3.0
+21.3.1