diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2a93ddc8..280e9fa7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
## [Unreleased]
+This release contains **BREAKING CHANGES**. See the [v6.0 Upgrade Guide][breaking6] for required
+changes you may need to make.
+
+[breaking6]: https://recyclarr.dev/wiki/upgrade-guide/v6.0/
+
+### Changed
+
+- **BREAKING**: Minimum required Sonarr version increased to `3.0.9.1549` (Previous minimum version
+ was `3.0.4.1098`).
+
## [5.4.3] - 2023-09-16
### Changed
diff --git a/src/Directory.Packages.props b/src/Directory.Packages.props
index 447d4dfe..9716e234 100644
--- a/src/Directory.Packages.props
+++ b/src/Directory.Packages.props
@@ -17,7 +17,6 @@
-
@@ -64,4 +63,4 @@
-
\ No newline at end of file
+
diff --git a/src/Recyclarr.Cli/Pipelines/ReleaseProfile/Api/ISonarrReleaseProfileCompatibilityHandler.cs b/src/Recyclarr.Cli/Pipelines/ReleaseProfile/Api/ISonarrReleaseProfileCompatibilityHandler.cs
deleted file mode 100644
index efa9052b..00000000
--- a/src/Recyclarr.Cli/Pipelines/ReleaseProfile/Api/ISonarrReleaseProfileCompatibilityHandler.cs
+++ /dev/null
@@ -1,14 +0,0 @@
-using Newtonsoft.Json.Linq;
-using Recyclarr.Cli.Pipelines.ReleaseProfile.Api.Objects;
-using Recyclarr.TrashLib.Config;
-
-namespace Recyclarr.Cli.Pipelines.ReleaseProfile.Api;
-
-public interface ISonarrReleaseProfileCompatibilityHandler
-{
- Task