> For the complete documentation index, see [llms.txt](https://help.sentinelsoftware.com/sentinel-help-center/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.sentinelsoftware.com/sentinel-help-center/installation-and-updates/software-updates.md).

# Software Updates

{% hint style="info" %}
Sentinel applications are backwards compatible. Updates between versions shall not exceed one (1) year to ensure continued functionality, security, and compatibility with supported platforms.
{% endhint %}

#### Download the Sentinel application package to your folder, using your email and password:

```shell
cd /home/user/Downloads/

wget --ask-password https://data.sentinelsoftware.com/releases/sentinel-21.x.x.jar \
--user=<user-email>
```

#### **Copy the Sentinel server file to the installation folder. opt/sentinel/  :**&#x20;

```shell
cp /home/user/Downloads/sentinel-21.x.x.jar /opt/sentinel/
```

#### **Create a SYMLINK to the new package:**&#x20;

```shell
ln -sf sentinel-21.x.x.jar sentinel.jar
```

#### **Restart related Sentinel service:** &#x20;

```shell
systemctl restart sentinel
```

#### **Restart NGINX service:**&#x20;

```shell
systemctl restart nginx
```

#### **Using a Chrome browser (require), enter the Sentinel domain to load the application.** &#x20;