diff --git a/documentation/Releasing.md b/documentation/Releasing.md
index e10ede1fe..d2181c1a7 100644
--- a/documentation/Releasing.md
+++ b/documentation/Releasing.md
@@ -9,6 +9,12 @@ In order to know what has changed, you can view the [commits](https://github.com
 
 For general guidance on writing a changelog, see [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## Update CSS Version
+Changes to the styling will sometimes not be visible due to caching. To prevent this, the CSS must be versioned.
+
+If any changes have been made to admin.css for this release:
+Change version in `wp_enqueue_style('onoffice-admin-css', plugins_url('/css/admin.css', ONOFFICE_PLUGIN_DIR.'/index.php'), array(), 'v4.20');` in `AdminViewController.php"`
+
 ## Development release
 
 1. Go to https://github.com/onOfficeGmbH/oo-wp-plugin/actions/workflows/development-release.yml.
@@ -45,6 +51,13 @@ For general guidance on writing a changelog, see [Keep a Changelog](https://keep
     2. Remove the tag from GitHub with `git push origin :v3.2`. (Only users with admin access to the repository can do this.)
     3. Re-add a tag by redoing step 3.
 
+## Update release Branch
+
+To be able to fix any critical problems anytime in current stable version, we update release branch on every release.
+
+1. Merge master into release.
+2. Push changes to release.
+
 ## Environment
 
 To push to the WordPress SVN you need to authenticate as the WordPress user @onofficeweb. We use a GitHub [environment](https://docs.github.com/en/actions/deployment/targeting-different-environments/using-environments-for-deployment) to store the credentials as secrets.
diff --git a/plugin.php b/plugin.php
index d0271ecb3..ecc2ce3b2 100644
--- a/plugin.php
+++ b/plugin.php
@@ -25,7 +25,7 @@
 Author: onOffice GmbH
 Author URI: https://en.onoffice.com/
 Description: Your connection to onOffice: This plugin enables you to have quick access to estates and forms – no additional sync with the software is needed. Consult support@onoffice.de for source code.
-Version: 4.19
+Version: 4.20
 License: AGPL 3+
 License URI: https://www.gnu.org/licenses/agpl-3.0
 Text Domain: onoffice-for-wp-websites
diff --git a/readme.txt b/readme.txt
index 5112bf732..e1505acc8 100644
--- a/readme.txt
+++ b/readme.txt
@@ -4,7 +4,7 @@ Tags: real estate, onoffice
 Requires at least: 4.6
 Tested up to: 6.4.3
 Requires PHP: 7.3
-Stable tag: 4.19
+Stable tag: 4.20
 License: AGPL 3.0
 License URI: https://www.gnu.org/licenses/agpl-3.0.html
 
@@ -76,7 +76,7 @@ Start editing inside the `onoffice-personalized` folder.
 
 == Changelog ==
 
-= 4.20 (2024-06-18) =
+= 4.20 (2024-06-26) =
 
 **Added**