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+## `dependency(version:)` now applies to all dependency types
+
+Previously, version constraints were only enforced for dependencies found using
+the pkg-config dependency provider.  These constraints now apply to dependencies
+found using any dependency provider.
+
+Some combinations of dependency, host and method do not currently support
+discovery of the version.  In these cases, the dependency will not be found if a
+version constraint is applied, otherwise the `version()` method for the
+dependency object will return `'unknown'`.
+
+(If discovering the version in one of these combinations is important to you,
+and a method exists to determine the version in that case, please file an issue
+with as much information as possible.)