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# Cron jobs do not run on Magento 1.8 after upgrade

> Learn how to resolve a cron job problem that may occur after you upgrade a Magento installation to version 1.8. We're here to help!

This article describes how to resolve a problem that may occur after you upgrade a Magento installation to version 1.8.

## Problem

After you upgrade a Magento installation to version 1.8, cron jobs do not appear to run. For example, you may notice that the following occurs:

* Catalog price rules are not updated.

* Newsletters are not sent.

* Google Sitemaps are not generated.

* Customer alerts are not sent.

* Currency rates are not updated.

## Resolution

To work around this problem, follow these steps:

1. Open the Magento *cron.php* file in a text editor. You can do this by logging in to your account [using SSH](/docs/using-ssh-secure-shell), or if your account includes cPanel, from the [cPanel File Manager](/docs/cpanel-file-manager).

2. Locate the following code block around line 45:

```
$disabledFuncs = explode(',', ini_get('disable_functions'));
$isShellDisabled = is _array($disabledFuncs)? in_array('shell_exec', $disabledFuncs): true;
$isShellDisabled = (stripos(PHP_OS, 'win') === false)? $isShellDisabled: true;
```

3. Copy the following line of code and paste it **after** the code block you located in step 2:

```
$isShellDisabled = true;
```

4. Save the changes to the *cron.php* file and exit the text editor. The cron job should now run correctly.