The 6.0.0 release basically brings PHP8 compatibility but also upgrades the underlying graphql-php to 14.0, bringing some breaking changes depending on your usage and thus the major version bump.
OTOH for those still on 5.x, I’ve also tagged https://github.com/rebing/graphql-laravel/releases/tag/5.1.5 which too supports PHP8 🤞 But it will be likely the last one for 5.x
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