The WordPress core code is updated pretty regularly and in most cases you’re going to want to make sure you upgrade to the latest stable version as soon as possible. Using the latest version of WordPress ensures that you have access to all the latest features and any security holes that have been discovered since the last update have been patched. However, despite extensive testing, it’s impossible to discover every bug and sometimes some do get through. More often, plugins don’t play nicely with the newer version of WordPress and it can take some time for plugin developers to catch up and release a new version. For these reasons, you may wish to revert to an earlier version of WordPress until these issues are sorted out. The same is true if you install a new version of a plugin or theme and have a problem with it. Usually rolling back versions should only be done temporarily until bugs are fixed and you can go ahead and update to the latest version again. Before You Downgrade Before you go ahead and downgrade the WordPress core code, you should be sure that’s definitely the best course of action. It’s normally plugins that cause bugs, rather than WordPress
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