• Plesk Uservoice will be deprecated by October. Moving forward, all product feature requests and improvement suggestions will be managed through our new platform Plesk Productboard.
    To continue sharing your ideas and feedback, please visit features.plesk.com

It's safe update to CentOS 5.9?

It is more related to fresh installation.
You can upgrade OS on system where Plesk already installed only on your own risk.
 
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