WordPress 7.1 continues to use React 18.3
React 19 upgrade won’t be a part of WordPress 7.1. After briefly enabling it in Gutenberg we discovered unexpected incompatibilities in how old and new version of React interact with each other, and in the ways how plugins use React, and we were forced to revert the change. We’ll need a considerable testing period where we improve and fine-tune the compatibility layer that allows the existing plugins to run seamlessly.
Experimental flag in Gutenberg
Instead, there is a new experiment in the Gutenberg plugin (since version 23.4) that enables React 19 on your
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