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+3.x Migration Guide
+###################
+
+Chronos 3.x contains breaking changes that could impact your application. This
+guide provides an overview of the breaking changes made in 3.x
+
+Minimum of PHP 8.1
+==================
+
+Chronos 3.x requires at least PHP 8.1. This allows chronos to provide more
+comprehensive typehinting and better performance by leveraging features found in
+newer PHP versions.
+
+MutableDateTime and MutableDate removed
+=======================================
+
+The ``MutableDateTime`` and ``MutableDate`` classes have been removed. Long term
+PHP will be deprecating and removing mutable datetime classes in favour of
+immutable ones. Chronos has long favoured immutable objects and removing the
+mutable variants helps simplify the internals of Chronos and encourages safer
+development practices.