diff --git a/How-to-Upgrade.md b/How-to-Upgrade.md
index 54bac9a..5f2a680 100644
--- a/How-to-Upgrade.md
+++ b/How-to-Upgrade.md
@@ -1,4 +1,12 @@
 Upgrading from one OpenSupports version to another consists in replacing the current files on your server and sometimes run a `.php` script to upgrade your MySQL database.
+## Upgrade v4.8.0 -> v4.9.0
+
+1. Do a database backup before upgrading for safety
+2. Download the upgrade [zip file](https://github.com/opensupports/opensupports/releases/download/v4.9.0/opensupports_v4.9.0_update.zip)
+3. Replace the OpenSupports files in your server with the content of the zip file.
+4. Go to the folder `version_upgrades/4.9.0/` and run the script with `php 4.9.0.php`
+5. After the script is done, remove the folder `version_upgrades`
+6. Upgrade should be complete. If you had some issues, feel free to open a ticket here at github.
 
 ## Upgrade v4.7.0 -> v4.8.0