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Plone 4 is nearing release candidate status, which is good news. But if you currently run a Plone 2/3.0/3.1 website, you do not want some add-on product (like Products.Poi) to surprise you by pulling in this brand new version. How can you make sure you are not caught unawares? Read on for a long example. For the impatient: just pin Plone.