diff --git a/CHANGELOG.md b/CHANGELOG.md
index 058886a..2eac8f0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,9 +4,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [5.1.0] - 2023-01-04
+
+### Added
+- Add new parameter `$helper_dir` ([#27])
 
 ### Changed
+- Increase NOFILE and NPROC service limits ([#25])
+- Increase MAX_MAP_COUNT service limit ([#26])
 - Run acceptance tests with latest version 9.8.0
 
 ### Fixed
@@ -143,6 +148,9 @@ migrate from maestrodev/sonarqube to this version with only minor modifications.
 [4.0.0]: https://github.com/markt-de/puppet-sonarqube/compare/v3.1.0...v4.0.0
 [3.1.0]: https://github.com/markt-de/puppet-sonarqube/compare/v3.0.0...v3.1.0
 [3.0.0]: https://github.com/markt-de/puppet-sonarqube/compare/v2.6.7...v3.0.0
+[#27]: https://github.com/markt-de/puppet-sonarqube/pull/27
+[#26]: https://github.com/markt-de/puppet-sonarqube/pull/26
+[#25]: https://github.com/markt-de/puppet-sonarqube/pull/25
 [#24]: https://github.com/markt-de/puppet-sonarqube/pull/24
 [#23]: https://github.com/markt-de/puppet-sonarqube/pull/23
 [#22]: https://github.com/markt-de/puppet-sonarqube/pull/22
diff --git a/REFERENCE.md b/REFERENCE.md
index a9335a8..6daef2d 100644
--- a/REFERENCE.md
+++ b/REFERENCE.md
@@ -282,6 +282,12 @@ Optional JVM options for embedded elasticsearch server.
 
 Default value: ``undef``
 
+##### `helper_dir`
+
+Data type: `Stdlib::Absolutepath`
+
+Specifies the directory for Sonarqube Helper scripts.
+
 ### `sonarqube::runner`
 
 Install and configure SonarQube Runner
diff --git a/metadata.json b/metadata.json
index 4112a3c..6090389 100644
--- a/metadata.json
+++ b/metadata.json
@@ -1,6 +1,6 @@
 {
   "name": "fraenki-sonarqube",
-  "version": "5.0.0",
+  "version": "5.1.0",
   "author": "markt.de",
   "summary": "SonarQube installation and configuration",
   "license": "Apache-2.0",