diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 5ed7dee..e7aa5a2 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -28,3 +28,5 @@ jobs:
     uses: StanfordBDHG/.github/.github/workflows/create-and-upload-coverage-report.yml@v2
     with:
       coveragereports: HealthKitOnOMH.xcresult
+    secrets:
+      token: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.swiftlint.yml b/.swiftlint.yml
index 57ce227..d1b41b7 100644
--- a/.swiftlint.yml
+++ b/.swiftlint.yml
@@ -141,8 +141,6 @@ only_rules:
   - implicitly_unwrapped_optional
   # Identifiers should use inclusive language that avoids discrimination against groups of people based on race, gender, or socioeconomic status
   - inclusive_language
-  # If defer is at the end of its parent scope, it will be executed right where it is anyway.
-  - inert_defer
   # Prefer using Set.isDisjoint(with:) over Set.intersection(_:).isEmpty.
   - is_disjoint
   # Discouraged explicit usage of the default separator.
@@ -329,8 +327,6 @@ only_rules:
   - unowned_variable_capture
   # Catch statements should not declare error variables without type casting.
   - untyped_error_in_catch
-  # Unused reference in a capture list should be removed.
-  - unused_capture_list
   # Unused parameter in a closure should be replaced with _.
   - unused_closure_parameter
   # Unused control flow label should be removed.
diff --git a/Package.swift b/Package.swift
index 278a963..65a114b 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.8
+// swift-tools-version:6.0
 
 //
 // This source file is part of the HealthKitOnOMH open source project
@@ -8,6 +8,7 @@
 // SPDX-License-Identifier: MIT
 //
 
+import class Foundation.ProcessInfo
 import PackageDescription
 
 
@@ -21,19 +22,39 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/StanfordBDHG/OMHModels.git", .upToNextMajor(from: "0.1.0"))
-    ],
+    ] + swiftLintPackage(),
     targets: [
         .target(
             name: "HealthKitOnOMH",
             dependencies: [
                 .product(name: "OMHModels", package: "OMHModels")
-            ]
+            ],
+            plugins: [] + swiftLintPlugin()
         ),
         .testTarget(
             name: "HealthKitOnOMHTests",
             dependencies: [
                 .target(name: "HealthKitOnOMH")
-            ]
+            ],
+            plugins: [] + swiftLintPlugin()
         )
     ]
 )
+
+
+func swiftLintPlugin() -> [Target.PluginUsage] {
+    // Fully quit Xcode and open again with `open --env SPEZI_DEVELOPMENT_SWIFTLINT /Applications/Xcode.app`
+    if ProcessInfo.processInfo.environment["SPEZI_DEVELOPMENT_SWIFTLINT"] != nil {
+        [.plugin(name: "SwiftLintBuildToolPlugin", package: "SwiftLint")]
+    } else {
+        []
+    }
+}
+
+func swiftLintPackage() -> [PackageDescription.Package.Dependency] {
+    if ProcessInfo.processInfo.environment["SPEZI_DEVELOPMENT_SWIFTLINT"] != nil {
+        [.package(url: "https://github.com/realm/SwiftLint.git", from: "0.55.1")]
+    } else {
+        []
+    }
+}