# Updating

Kirby CMS is a flat-file system, so every update is done by simple copy-paste or FTP file overwrite.

{% hint style="danger" %}
**KIRBY BEGINNERS NOTICE:** Never update **`content`** folder. It is the folder where your website content is stored. If you are unsure of what you are doing, then create a backup of your website first.

**Also, when updating/overwriting, take care and skip overwriting these (if not said otherwise):**

* **config files** (..site/config/ folder), because you certainly made some changes to those files
* **language files** (..site/languages/ folder) 
  {% endhint %}

### Zero One theme update

**Zero One is a plugin, so you will usually just have to update `site/plugins/zero-one/` folder.** 

<mark style="background-color:yellow;">If we change something in the</mark> <mark style="background-color:yellow;"></mark><mark style="background-color:yellow;">`assets`</mark> <mark style="background-color:yellow;"></mark><mark style="background-color:yellow;">folder, add some new config option, or integrate a new plugin, you will be notified about that in the</mark> [<mark style="background-color:yellow;">changelog</mark>](https://www.one.thezero.club/changelog)<mark style="background-color:yellow;">.</mark>&#x20;

{% hint style="danger" %}
Please, always read the update instructions in the [changelog](https://www.one.thezero.club/changelog).
{% endhint %}

### Kirby update

When Kirby updates happen, you can update it yourself, just update the content in `zero-one/kirby/` folder.

**If there are some big changes in Kirby,** we suggest you wait until we first update and test, and if needed, make some fixes. You will find detailed update instructions at <https://www.one.thezero.club/changelog> if that happens.

#### These are the files that need updating in 95% of updates:

* `assets` folder
* `kirby` folder
* `site/plugins` folder
* `composer.json` file&#x20;

{% hint style="info" %}
When you update `assets` folder make sure to go to the Site Styling tab after that, turn on Style Compiler, and refresh some frontend page to recreate the CSS stylesheet. Of course, turn off Style Compiler after that.
{% endhint %}

#### Reverse update

You can also do the so-called "reverse update": download new Zero One version files, delete the `content` folder, and add `content` folder from your active website instead.