diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0051490..a52b69c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,18 +9,16 @@ on:
 jobs:
   xcode-build:
     name: Xcode Build
-    runs-on: macOS-11
+    runs-on: macOS-14
     strategy:
       matrix:
-        platform: ['iOS_14', 'iOS_13']
+        platform: ['iOS_17', 'iPadOS_17']
       fail-fast: false
     steps:
       - name: Checkout Repo
         uses: actions/checkout@v4
       - name: Select Xcode Version
-        run: sudo xcode-select --switch /Applications/Xcode_13.2.1.app/Contents/Developer
-      - name: Prepare Simulator Runtimes
-        run: Scripts/github/prepare-simulators.sh ${{ matrix.platform }}
+        run: sudo xcode-select --switch /Applications/Xcode_15.4.app/Contents/Developer
       - name: Bundle Install
         run: bundle install
       - name: Pod Install
@@ -35,37 +33,37 @@ jobs:
           path: .build/derivedData/**/Logs/Test/*.xcresult
   pod-lint:
     name: Lint Pod
-    runs-on: macOS-12
+    runs-on: macOS-14
     steps:
       - name: Checkout Repo
         uses: actions/checkout@v4
       - name: Bundle Install
         run: bundle install
       - name: Select Xcode Version
-        run: sudo xcode-select --switch /Applications/Xcode_14.1.app/Contents/Developer
+        run: sudo xcode-select --switch /Applications/Xcode_15.4.app/Contents/Developer
       - name: Lint Podspec
         run: bundle exec pod lib lint --verbose --fail-fast
   spm:
     name: SPM Build
-    runs-on: macOS-12
+    runs-on: macOS-14
     strategy:
       matrix:
-        platform: ['iOS_16', 'iOS_15']
+        platform: ['iOS_17']
       fail-fast: false
     steps:
       - name: Checkout Repo
         uses: actions/checkout@v4
       - name: Select Xcode Version
-        run: sudo xcode-select --switch /Applications/Xcode_14.1.app/Contents/Developer
-      - name: Prepare Simulator Runtimes
-        run: Scripts/github/prepare-simulators.sh ${{ matrix.platform }}
+        run: sudo xcode-select --switch /Applications/Xcode_15.4.app/Contents/Developer
       - name: Build
         run: Scripts/build.swift spm ${{ matrix.platform }} `which xcpretty`
   bazel:
     name: Bazel
-    runs-on: macOS-12
+    runs-on: macOS-14
     steps:
       - name: Checkout Repo
         uses: actions/checkout@v4
+      - name: Select Xcode Version
+        run: sudo xcode-select --switch /Applications/Xcode_15.4.app/Contents/Developer
       - name: Build and Test
-        run: bazel test //...
+        run: bazel test //... --xcode_version=15.4.0
diff --git a/BUILD.bazel b/BUILD.bazel
index 776f42e..09b6364 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -12,6 +12,7 @@ swift_library(
     name = "Paralayout.lib",
     srcs = glob(["Paralayout/**/*.swift"]),
     module_name = "Paralayout",
+    copts = ["-strict-concurrency=complete"],
     tags = ["manual"],
     visibility = ["//visibility:public"],
     deps = [],
@@ -22,6 +23,7 @@ swift_library(
     testonly = True,
     srcs = glob(["ParalayoutTests/**/*.swift"]),
     module_name = "ParalayoutTests",
+    copts = ["-strict-concurrency=complete"],
     tags = ["manual"],
     deps = [":Paralayout.lib"],
 )
@@ -34,7 +36,7 @@ ios_framework(
         "ipad",
     ],
     infoplists = ["Paralayout/Info.plist"],
-    minimum_os_version = "12.0",
+    minimum_os_version = "13.0",
     visibility = ["//visibility:public"],
     deps = [":Paralayout.lib"],
 )
@@ -42,7 +44,7 @@ ios_framework(
 ios_unit_test(
     name = "ParalayoutTests",
     bundle_name = "ParalayoutTests",
-    minimum_os_version = "12.0",
+    minimum_os_version = "13.0",
     runner = "@rules_apple//apple/testing/default_runner:ios_xctestrun_ordered_runner",
     deps = [":ParalayoutTests.lib"],
 )
diff --git a/Example/ParalayoutDemo.xcodeproj/project.pbxproj b/Example/ParalayoutDemo.xcodeproj/project.pbxproj
index 3484bfd..61ac173 100644
--- a/Example/ParalayoutDemo.xcodeproj/project.pbxproj
+++ b/Example/ParalayoutDemo.xcodeproj/project.pbxproj
@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 51;
+	objectVersion = 54;
 	objects = {
 
 /* Begin PBXBuildFile section */
@@ -418,6 +418,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_STRICT_CONCURRENCY = complete;
 			};
 			name = Debug;
 		};
@@ -472,6 +473,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				SWIFT_STRICT_CONCURRENCY = complete;
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;
diff --git a/Example/ParalayoutSnapshotTests/SnapshotTestCase.swift b/Example/ParalayoutSnapshotTests/SnapshotTestCase.swift
index 663d05a..26623c8 100644
--- a/Example/ParalayoutSnapshotTests/SnapshotTestCase.swift
+++ b/Example/ParalayoutSnapshotTests/SnapshotTestCase.swift
@@ -14,7 +14,7 @@
 //  limitations under the License.
 //
 
-import SnapshotTesting
+@preconcurrency import SnapshotTesting
 import XCTest
 
 class SnapshotTestCase: XCTestCase {
@@ -31,6 +31,7 @@ class SnapshotTestCase: XCTestCase {
 
         // MARK: - Public Methods
 
+        @MainActor
         func matchesCurrentDevice() -> Bool {
             let device = UIDevice.current
             let screen = UIScreen.main
@@ -46,28 +47,31 @@ class SnapshotTestCase: XCTestCase {
 
     private static let testedDevices = [
 
-        // iPhone 12 Pro (14.4)
-        TestDeviceConfig(systemVersion: "14.4", screenSize: CGSize(width: 390, height: 844), screenScale: 3),
+        // iPhone 15 Pro - iOS 17.5
+        TestDeviceConfig(systemVersion: "17.5", screenSize: CGSize(width: 393, height: 852), screenScale: 3),
 
-        // iPhone 11 Pro (13.7)
-        TestDeviceConfig(systemVersion: "13.7", screenSize: CGSize(width: 375, height: 812), screenScale: 3),
+        // iPad (10th Generation) - iPadOS 17.5
+        TestDeviceConfig(systemVersion: "17.5", screenSize: CGSize(width: 820, height: 1180), screenScale: 2),
 
     ]
 
     // MARK: - XCTestCase
 
-    override class func setUp() {
-        super.setUp()
+    override func setUp() async throws {
+        try await super.setUp()
 
-        guard SnapshotTestCase.testedDevices.contains(where: { $0.matchesCurrentDevice() }) else {
-            fatalError("Attempting to run tests on a device for which we have not collected test data")
-        }
+        await Task { @MainActor in
+            guard SnapshotTestCase.testedDevices.contains(where: { $0.matchesCurrentDevice() }) else {
+                fatalError("Attempting to run tests on a device for which we have not collected test data")
+            }
 
-        isRecording = false
+            isRecording = false
+        }.value
     }
 
     // MARK: - Public Methods
 
+    @MainActor
     func nameForSnapshot(with parameters: [String?]) -> String {
         let size = UIScreen.main.bounds.size
         let scale = UIScreen.main.scale
diff --git a/Example/ParalayoutSnapshotTests/ViewAlignmentSnapshotTests.swift b/Example/ParalayoutSnapshotTests/ViewAlignmentSnapshotTests.swift
index e9250ba..dd549d6 100644
--- a/Example/ParalayoutSnapshotTests/ViewAlignmentSnapshotTests.swift
+++ b/Example/ParalayoutSnapshotTests/ViewAlignmentSnapshotTests.swift
@@ -19,6 +19,7 @@ import SnapshotTesting
 
 final class ViewAlignmentSnapshotTests: SnapshotTestCase {
 
+    @MainActor
     func testSiblingAlignment() {
         let containerView = UIView(frame: .init(x: 0, y: 0, width: 200, height: 200))
         containerView.backgroundColor = .white
@@ -80,6 +81,7 @@ final class ViewAlignmentSnapshotTests: SnapshotTestCase {
         verifySnapshot(receiverPosition: .center, targetPosition: .topRight, verticalOffset: -15)
     }
 
+    @MainActor
     func testLayoutDirection() {
         let containerView = UIView(frame: .init(x: 0, y: 0, width: 100, height: 100))
         containerView.backgroundColor = .white
@@ -140,6 +142,7 @@ final class ViewAlignmentSnapshotTests: SnapshotTestCase {
         assertSnapshot(matching: containerView, as: .image, named: nameForSnapshot(with: []))
     }
 
+    @MainActor
     func testTransformHasNoEffect() {
         let containerView = UIView(frame: .init(x: 0, y: 0, width: 100, height: 100))
         containerView.backgroundColor = .white
@@ -185,6 +188,7 @@ final class ViewAlignmentSnapshotTests: SnapshotTestCase {
         verifySnapshot(receiverTransform: .identity, targetTransform: .init(scaleX: 2, y: 3))
     }
 
+    @MainActor
     func testNonZeroBoundsOrigin() {
         let containerView = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
         containerView.backgroundColor = .white
@@ -213,6 +217,7 @@ final class ViewAlignmentSnapshotTests: SnapshotTestCase {
         assertSnapshot(matching: containerView, as: .image, named: nameForSnapshot(with: []))
     }
 
+    @MainActor
     func testAlignmentWithLayoutMargins() {
         let containerView = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
         containerView.backgroundColor = .white
@@ -246,6 +251,7 @@ final class ViewAlignmentSnapshotTests: SnapshotTestCase {
         assertSnapshot(matching: containerView, as: .image, named: nameForSnapshot(with: ["bothLayoutMargins"]))
     }
 
+    @MainActor
     func testAlignmentUsingCapInsets() {
         let containerView = UIView(frame: CGRect(x: 0, y: 0, width: 250, height: 100))
         containerView.backgroundColor = .white
@@ -269,6 +275,7 @@ final class ViewAlignmentSnapshotTests: SnapshotTestCase {
         assertSnapshot(matching: containerView, as: .image, named: nameForSnapshot(with: []))
     }
 
+    @MainActor
     func testAlignmentUsingFirstLine() {
         let containerView = UIView(frame: CGRect(x: 0, y: 0, width: 250, height: 100))
         containerView.backgroundColor = .white
@@ -299,6 +306,7 @@ final class ViewAlignmentSnapshotTests: SnapshotTestCase {
         assertSnapshot(matching: containerView, as: .image, named: nameForSnapshot(with: []))
     }
 
+    @MainActor
     func testAlignmentUsingFirstLineCapInsets() {
         let containerView = UIView(frame: CGRect(x: 0, y: 0, width: 250, height: 100))
         containerView.backgroundColor = .white
@@ -329,6 +337,7 @@ final class ViewAlignmentSnapshotTests: SnapshotTestCase {
         assertSnapshot(matching: containerView, as: .image, named: nameForSnapshot(with: []))
     }
 
+    @MainActor
     func testAlignmentWithRect() {
         let containerView = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
         containerView.backgroundColor = .white
@@ -365,6 +374,7 @@ final class ViewAlignmentSnapshotTests: SnapshotTestCase {
         assertSnapshot(matching: containerView, as: .image, named: nameForSnapshot(with: []))
     }
 
+    @MainActor
     func testAlignmentWithFrame() {
         let targetTransform = CGAffineTransform(translationX: -20, y: 10)
         let receiverTransform = CGAffineTransform(scaleX: 0.8, y: 0.8)
diff --git a/Example/ParalayoutSnapshotTests/ViewDistributionSnapshotTests.swift b/Example/ParalayoutSnapshotTests/ViewDistributionSnapshotTests.swift
index 7a63b0e..fd2f9f7 100644
--- a/Example/ParalayoutSnapshotTests/ViewDistributionSnapshotTests.swift
+++ b/Example/ParalayoutSnapshotTests/ViewDistributionSnapshotTests.swift
@@ -19,6 +19,7 @@ import SnapshotTesting
 
 final class ViewDistributionSnapshotTests: SnapshotTestCase {
 
+    @MainActor
     func testDistribution() {
         let containerView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 200))
         containerView.backgroundColor = .white
@@ -45,6 +46,7 @@ final class ViewDistributionSnapshotTests: SnapshotTestCase {
         assertSnapshot(matching: containerView, as: .image, named: nameForSnapshot(with: ["vertical"]))
     }
 
+    @MainActor
     func testDistributionIgnoresTransform() {
         let containerView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 200))
         containerView.backgroundColor = .white
@@ -72,6 +74,7 @@ final class ViewDistributionSnapshotTests: SnapshotTestCase {
         assertSnapshot(matching: containerView, as: .image, named: nameForSnapshot(with: []))
     }
 
+    @MainActor
     func testDistributionUsingCapInsets() {
         let containerView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 80))
         containerView.backgroundColor = .white
@@ -104,6 +107,7 @@ final class ViewDistributionSnapshotTests: SnapshotTestCase {
         assertSnapshot(matching: containerView, as: .image, named: nameForSnapshot(with: []))
     }
 
+    @MainActor
     func testHorizontalDistributionFollowsLayoutDirection() {
         let view = HorizontalDistributionView(frame: CGRect(x: 0, y: 0, width: 160, height: 60))
 
diff --git a/Example/ParalayoutSnapshotTests/ViewSpreadingSnapshotTests.swift b/Example/ParalayoutSnapshotTests/ViewSpreadingSnapshotTests.swift
index 6c03698..b86c8c8 100644
--- a/Example/ParalayoutSnapshotTests/ViewSpreadingSnapshotTests.swift
+++ b/Example/ParalayoutSnapshotTests/ViewSpreadingSnapshotTests.swift
@@ -19,6 +19,7 @@ import SnapshotTesting
 
 final class ViewSpeadingSnapshotTests: SnapshotTestCase {
 
+    @MainActor
     func testHorizontallySpreadSubviews() {
         let container = UIView(frame: CGRect(x: 0, y: 0, width: 400, height: 100))
         container.backgroundColor = .white
@@ -92,6 +93,7 @@ final class ViewSpeadingSnapshotTests: SnapshotTestCase {
         verifySnapshot(margin: 40, inRect: CGRect(x: 20, y: 10, width: 300, height: 50))
     }
 
+    @MainActor
     func testVerticallySpreadSubviews() {
         let container = UIView(frame: CGRect(x: 0, y: 0, width: 400, height: 100))
         container.backgroundColor = .white
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rename to Example/ParalayoutSnapshotTests/__Snapshots__/ViewSpreadingSnapshotTests/testVerticallySpreadSubviews.trailing_RTL_393x852-17-5-3x.png
index 3177305..57920f1 100644
Binary files a/Example/ParalayoutSnapshotTests/__Snapshots__/ViewSpreadingSnapshotTests/testVerticallySpreadSubviews.leading_LTR_390x844-14-4-3x.png and b/Example/ParalayoutSnapshotTests/__Snapshots__/ViewSpreadingSnapshotTests/testVerticallySpreadSubviews.trailing_RTL_393x852-17-5-3x.png differ
diff --git a/Example/ParalayoutSnapshotTests/__Snapshots__/ViewSpreadingSnapshotTests/testVerticallySpreadSubviews.trailing_RTL_820x1180-17-5-2x.png b/Example/ParalayoutSnapshotTests/__Snapshots__/ViewSpreadingSnapshotTests/testVerticallySpreadSubviews.trailing_RTL_820x1180-17-5-2x.png
new file mode 100644
index 0000000..90146fa
Binary files /dev/null and b/Example/ParalayoutSnapshotTests/__Snapshots__/ViewSpreadingSnapshotTests/testVerticallySpreadSubviews.trailing_RTL_820x1180-17-5-2x.png differ
diff --git a/Example/Podfile.lock b/Example/Podfile.lock
index 307671d..bce8c10 100644
--- a/Example/Podfile.lock
+++ b/Example/Podfile.lock
@@ -1,6 +1,6 @@
 PODS:
-  - Paralayout (1.0.0)
-  - Paralayout/Tests (1.0.0)
+  - Paralayout (1.1.0)
+  - Paralayout/Tests (1.1.0)
   - SnapshotTesting (1.8.2)
 
 DEPENDENCIES:
@@ -17,9 +17,9 @@ EXTERNAL SOURCES:
     :path: "../Paralayout.podspec"
 
 SPEC CHECKSUMS:
-  Paralayout: 63a087763d2c7a1b9c55843064e889aa27bdb56a
+  Paralayout: 148233f7ff311384bcb209bf0b1b8a1578ad1d34
   SnapshotTesting: 38947050d13960d57a4a9c166fcf51bca7d56970
 
 PODFILE CHECKSUM: f0cdc6633e8d65e479af433fa427d7c0ce7c72b1
 
-COCOAPODS: 1.11.3
+COCOAPODS: 1.14.3
diff --git a/Package.swift b/Package.swift
index 75c67c5..d7bcab0 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.0.1
+// swift-tools-version:5.9
 
 //
 //  Copyright 2020 Square Inc.
@@ -21,7 +21,7 @@ import PackageDescription
 let package = Package(
 	name: "Paralayout",
 	platforms: [
-		.iOS(.v12),
+		.iOS(.v13),
 	],
 	products: [
 		.library(
@@ -33,13 +33,16 @@ let package = Package(
 		.target(
 			name: "Paralayout",
 			dependencies: [],
-			path: "Paralayout"
+			path: "Paralayout",
+			swiftSettings: [
+				.enableExperimentalFeature("StrictConcurrency")
+			]
 		),
 		.testTarget(
-            name: "ParalayoutTests",
-            dependencies: ["Paralayout"],
-            path: "ParalayoutTests"
-        ),
+			name: "ParalayoutTests",
+			dependencies: ["Paralayout"],
+			path: "ParalayoutTests"
+		),
 	],
 	swiftLanguageVersions: [.v5]
 )
diff --git a/Paralayout.podspec b/Paralayout.podspec
index 86e21ce..0d48b8e 100644
--- a/Paralayout.podspec
+++ b/Paralayout.podspec
@@ -1,14 +1,14 @@
 Pod::Spec.new do |s|
   s.name     = 'Paralayout'
-  s.version  = '1.0.0'
+  s.version  = '1.1.0'
   s.license  = 'Apache License, Version 2.0'
   s.summary  = 'Paralayout is a simple set of assistive UI layout utilities. Size and position your UI with pixel-perfect precision. Design will love you!'
   s.homepage = 'https://github.com/square/Paralayout'
   s.authors  = 'Square'
   s.source   = { :git => 'https://github.com/square/Paralayout.git', :tag => s.version }
   s.source_files = 'Paralayout/*.{swift}'
-  s.ios.deployment_target = '12.0'
-  s.swift_version = '5.0'
+  s.ios.deployment_target = '13.0'
+  s.swift_version = '5.9'
 
   s.test_spec 'Tests' do |test_spec|
     test_spec.source_files = 'ParalayoutTests/*{.swift}'
diff --git a/Paralayout/Alignable.swift b/Paralayout/Alignable.swift
index 5595602..5f782f4 100644
--- a/Paralayout/Alignable.swift
+++ b/Paralayout/Alignable.swift
@@ -17,12 +17,14 @@
 import UIKit
 
 /// Describes an object that can participate in alignment. In practice, this represents a view.
+@MainActor
 public protocol Alignable {
 
     var alignmentContext: AlignmentContext { get }
 
 }
 
+@MainActor
 public struct AlignmentContext {
 
     // MARK: - Life Cycle
diff --git a/Paralayout/Angle.swift b/Paralayout/Angle.swift
index 4d9b716..ae41c9b 100644
--- a/Paralayout/Angle.swift
+++ b/Paralayout/Angle.swift
@@ -16,7 +16,7 @@
 
 import CoreGraphics
 
-public struct Angle: Comparable {
+public struct Angle: Comparable, Sendable {
 
     // MARK: - Public Static Properties
 
diff --git a/Paralayout/AspectRatio.swift b/Paralayout/AspectRatio.swift
index a42684e..2080901 100644
--- a/Paralayout/AspectRatio.swift
+++ b/Paralayout/AspectRatio.swift
@@ -17,7 +17,7 @@
 import UIKit
 
 /// A value type representing the ratio between a width and a height.
-public struct AspectRatio: Comparable, CustomDebugStringConvertible {
+public struct AspectRatio: Comparable, CustomDebugStringConvertible, Sendable {
 
     // MARK: - Public Static Properties
 
@@ -105,6 +105,7 @@ public struct AspectRatio: Comparable, CustomDebugStringConvertible {
     ///
     /// - parameter width: The desired width.
     /// - parameter scaleFactor: The view/window/screen to use for pixel rounding.
+    @MainActor
     public func height(forWidth width: CGFloat, in scaleFactor: ScaleFactorProviding) -> CGFloat {
         return (ratioHeight * width / ratioWidth).roundedToPixel(in: scaleFactor)
     }
@@ -113,6 +114,7 @@ public struct AspectRatio: Comparable, CustomDebugStringConvertible {
     ///
     /// - parameter height: The desired height.
     /// - parameter scaleFactor: The view/window/screen to use for pixel rounding.
+    @MainActor
     public func width(forHeight height: CGFloat, in scaleFactor: ScaleFactorProviding) -> CGFloat {
         return (ratioWidth * height / ratioHeight).roundedToPixel(in: scaleFactor)
     }
@@ -122,6 +124,7 @@ public struct AspectRatio: Comparable, CustomDebugStringConvertible {
     ///
     /// - parameter width: The desired width.
     /// - parameter scaleFactor: The view/window/screen to use for pixel rounding.
+    @MainActor
     public func size(forWidth width: CGFloat, in scaleFactor: ScaleFactorProviding) -> CGSize {
         return CGSize(
             width: width,
@@ -134,6 +137,7 @@ public struct AspectRatio: Comparable, CustomDebugStringConvertible {
     ///
     /// - parameter height: The desired height.
     /// - parameter scaleFactor: The view/window/screen to use for pixel rounding.
+    @MainActor
     public func size(forHeight height: CGFloat, in scaleFactor: ScaleFactorProviding) -> CGSize {
         return CGSize(
             width: width(forHeight: height, in: scaleFactor),
@@ -147,6 +151,7 @@ public struct AspectRatio: Comparable, CustomDebugStringConvertible {
     /// - parameter size: The bounding size.
     /// - parameter scaleFactor: The view/window/screen to use for pixel alignment.
     /// - returns: A size with the receiver's aspect ratio, no larger than the bounding size.
+    @MainActor
     public func size(toFit size: CGSize, in scaleFactor: ScaleFactorProviding) -> CGSize {
         if size.aspectRatio <= self {
             // Match width, narrow the height.
@@ -169,6 +174,7 @@ public struct AspectRatio: Comparable, CustomDebugStringConvertible {
     /// - parameter scaleFactor: The view/window/screen to use for pixel alignment.
     /// - parameter layoutDirection: The effective layout direction of the view in which the `rect` is defined.
     /// - returns: A rect with the receiver's aspect ratio, strictly within the bounding rect.
+    @MainActor
     public func rect(
         toFit rect: CGRect,
         at position: Position,
@@ -193,6 +199,7 @@ public struct AspectRatio: Comparable, CustomDebugStringConvertible {
     /// - parameter context: The view/window/screen that provides the scale factor and effective layout direction in
     /// which the rect should be positioned.
     /// - returns: A rect with the receiver's aspect ratio, strictly within the bounding rect.
+    @MainActor
     public func rect(
         toFit rect: CGRect,
         at position: Position,
@@ -212,6 +219,7 @@ public struct AspectRatio: Comparable, CustomDebugStringConvertible {
     /// - parameter size: The bounding size.
     /// - parameter scaleFactor: The view/window/screen to use for pixel alignment.
     /// - returns: A size with the receiver's aspect ratio, at least as large as the bounding size.
+    @MainActor
     public func size(toFill size: CGSize, in scaleFactor: ScaleFactorProviding) -> CGSize {
         if size.aspectRatio <= self {
             // Match height, expand the width.
@@ -234,6 +242,7 @@ public struct AspectRatio: Comparable, CustomDebugStringConvertible {
     /// - parameter scaleFactor: The view/window/screen to use for pixel alignment.
     /// - parameter layoutDirection: The effective layout direction of the view in which the `rect` is defined.
     /// - returns: A rect with the receiver's aspect ratio, strictly containing the bounding rect.
+    @MainActor
     public func rect(
         toFill rect: CGRect,
         at position: Position,
@@ -257,6 +266,7 @@ public struct AspectRatio: Comparable, CustomDebugStringConvertible {
     /// - parameter context: The view/window/screen that provides the scale factor and effective layout direction in
     /// which the rect should be positioned.
     /// - returns: A rect with the receiver's aspect ratio, strictly containing the bounding rect.
+    @MainActor
     public func rect(
         toFill rect: CGRect,
         at position: Position,
@@ -294,6 +304,7 @@ extension CGRect {
 
     // MARK: - Life Cycle
 
+    @MainActor
     fileprivate init(
         size newSize: CGSize,
         at position: Position,
diff --git a/Paralayout/Interpolation.swift b/Paralayout/Interpolation.swift
index 81a2143..b2ead9a 100644
--- a/Paralayout/Interpolation.swift
+++ b/Paralayout/Interpolation.swift
@@ -102,7 +102,7 @@ public enum Clamp {
 
 // MARK: -
 
-public struct Interpolation: Comparable {
+public struct Interpolation: Comparable, Sendable {
 
     // MARK: - Public Types
     
diff --git a/Paralayout/LayoutDirection.swift b/Paralayout/LayoutDirection.swift
index 1636ca1..632aabd 100644
--- a/Paralayout/LayoutDirection.swift
+++ b/Paralayout/LayoutDirection.swift
@@ -17,6 +17,7 @@
 import UIKit
 
 /// Defines an object that vends its current user interface layout direction.
+@MainActor
 public protocol LayoutDirectionProviding {
 
     var effectiveUserInterfaceLayoutDirection: UIUserInterfaceLayoutDirection { get }
diff --git a/Paralayout/PixelRounding.swift b/Paralayout/PixelRounding.swift
index 3ac4f17..afd1451 100644
--- a/Paralayout/PixelRounding.swift
+++ b/Paralayout/PixelRounding.swift
@@ -17,6 +17,7 @@
 import UIKit
 
 /// The ratio of pixels to points, either of a UIScreen, a UIView's screen, or an explicit value.
+@MainActor
 public protocol ScaleFactorProviding {
 
     var pixelsPerPoint: CGFloat { get }
@@ -76,6 +77,7 @@ extension CGFloat {
     /// - parameter scaleFactor: The pixel scale to use, e.g. a UIScreen, UIView, or explicit value (pass `0` to *not*
     /// snap to pixel).
     /// - returns: The adjusted coordinate.
+    @MainActor
     public func flooredToPixel(in scaleFactor: ScaleFactorProviding) -> CGFloat {
         return adjustedToPixel(scaleFactor) { floor($0) }
     }
@@ -85,6 +87,7 @@ extension CGFloat {
     /// - parameter scaleFactor: The pixel scale to use, e.g. a UIScreen, UIView, or explicit value (pass `0` to *not*
     /// snap to pixel).
     /// - returns: The adjusted coordinate.
+    @MainActor
     public func ceiledToPixel(in scaleFactor: ScaleFactorProviding) -> CGFloat {
         return adjustedToPixel(scaleFactor) { ceil($0) }
     }
@@ -94,6 +97,7 @@ extension CGFloat {
     /// - parameter scaleFactor: The pixel scale to use, e.g. a UIScreen, UIView, or explicit value (pass `0` to *not*
     /// snap to pixel).
     /// - returns: The adjusted coordinate.
+    @MainActor
     public func roundedToPixel(in scaleFactor: ScaleFactorProviding) -> CGFloat {
         // Invoke the namespaced Darwin.round() function since round() is ambiguous (it's also a mutating instance
         // method).
@@ -102,6 +106,7 @@ extension CGFloat {
 
     // MARK: - Private Methods
 
+    @MainActor
     private func adjustedToPixel(_ scaleFactor: ScaleFactorProviding, _ adjustment: (CGFloat) -> CGFloat) -> CGFloat {
         let scale = scaleFactor.pixelsPerPoint
         return (scale > 0.0) ? (adjustment(self * scale) / scale) : self
@@ -117,6 +122,7 @@ extension CGPoint {
     /// - parameter scaleFactor: The pixel scale to use, e.g. a UIScreen, UIView, or explicit value (pass `0` to *not*
     /// snap to pixel).
     /// - returns: The adjusted coordinate.
+    @MainActor
     public func flooredToPixel(in scaleFactor: ScaleFactorProviding) -> CGPoint {
         return CGPoint(x: x.flooredToPixel(in: scaleFactor), y: y.flooredToPixel(in: scaleFactor))
     }
@@ -127,6 +133,7 @@ extension CGPoint {
     /// - parameter scaleFactor: The pixel scale to use, e.g. a UIScreen, UIView, or explicit value (pass `0` to *not*
     /// snap to pixel).
     /// - returns: The adjusted coordinate.
+    @MainActor
     public func ceiledToPixel(in scaleFactor: ScaleFactorProviding) -> CGPoint {
         return CGPoint(x: x.ceiledToPixel(in: scaleFactor), y: y.ceiledToPixel(in: scaleFactor))
     }
@@ -137,6 +144,7 @@ extension CGPoint {
     /// - parameter scaleFactor: The pixel scale to use, e.g. a UIScreen, UIView, or explicit value (pass `0` to *not*
     /// snap to pixel).
     /// - returns: The adjusted coordinate.
+    @MainActor
     public func roundedToPixel(in scaleFactor: ScaleFactorProviding) -> CGPoint {
         return CGPoint(x: x.roundedToPixel(in: scaleFactor), y: y.roundedToPixel(in: scaleFactor))
     }
@@ -150,6 +158,7 @@ extension CGSize {
     /// - parameter scaleFactor: The pixel scale to use, e.g. a UIScreen, UIView, or explicit value (pass `0` to *not*
     /// snap to pixel).
     /// - returns: The adjusted coordinate.
+    @MainActor
     public func flooredToPixel(in scaleFactor: ScaleFactorProviding) -> CGSize {
         return CGSize(width: width.flooredToPixel(in: scaleFactor), height: height.flooredToPixel(in: scaleFactor))
     }
@@ -159,6 +168,7 @@ extension CGSize {
     /// - parameter scaleFactor: The pixel scale to use, e.g. a UIScreen, UIView, or explicit value (pass `0` to *not*
     /// snap to pixel).
     /// - returns: The adjusted coordinate.
+    @MainActor
     public func ceiledToPixel(in scaleFactor: ScaleFactorProviding) -> CGSize {
         return CGSize(width: width.ceiledToPixel(in: scaleFactor), height: height.ceiledToPixel(in: scaleFactor))
     }
@@ -168,6 +178,7 @@ extension CGSize {
     /// - parameter scaleFactor: The pixel scale to use, e.g. a UIScreen, UIView, or explicit value (pass `0` to *not*
     /// snap to pixel).
     /// - returns: The adjusted coordinate.
+    @MainActor
     public func roundedToPixel(in scaleFactor: ScaleFactorProviding) -> CGSize {
         return CGSize(width: width.roundedToPixel(in: scaleFactor), height: height.roundedToPixel(in: scaleFactor))
     }
@@ -181,6 +192,7 @@ extension CGRect {
     /// - parameter scaleFactor: The pixel scale to use, e.g. a UIScreen, UIView, or explicit value (pass `0` to *not*
     /// snap to pixel).
     /// - returns: A new rect with pixel-aligned boundaries, enclosing the original rect.
+    @MainActor
     public func expandedToPixel(in scaleFactor: ScaleFactorProviding) -> CGRect {
         return CGRect(
             left: minX.flooredToPixel(in: scaleFactor),
@@ -195,6 +207,7 @@ extension CGRect {
     /// - parameter scaleFactor: The pixel scale to use, e.g. a UIScreen, UIView, or explicit value (pass `0` to *not*
     /// snap to pixel).
     /// - returns: A new rect with pixel-aligned boundaries, enclosed by the original rect.
+    @MainActor
     public func contractedToPixel(in scaleFactor: ScaleFactorProviding) -> CGRect {
         return CGRect(
             left: minX.ceiledToPixel(in: scaleFactor),
diff --git a/Paralayout/UIFont+CapInsets.swift b/Paralayout/UIFont+CapInsets.swift
index 211cda8..e18d8aa 100644
--- a/Paralayout/UIFont+CapInsets.swift
+++ b/Paralayout/UIFont+CapInsets.swift
@@ -22,7 +22,7 @@ extension UIFont {
     
     /// The insets, in points, from the top of a UILabel to its font's capHeight, and from the font's baseline to the
     /// label's bottom.
-    public struct LabelCapInsets {
+    public struct LabelCapInsets: Sendable {
 
         // MARK: - Public Properties
 
@@ -61,6 +61,7 @@ extension UIFont {
     /// The space above and below the receiver's capHeight and baseline, as displayed in a UILabel.
     /// - parameter scaleFactor: The UI scale factor for pixel rounding.
     /// - returns: The insets.
+    @MainActor
     public func labelCapInsets(in scaleFactor: ScaleFactorProviding) -> LabelCapInsets {
         // One would expect ceil(ascender) - floor(descender) so that the baseline would land on a pixel boundary, but
         // sadly no--this is what `UILabel.sizeToFit()` does.
diff --git a/Paralayout/UIView+Alignment.swift b/Paralayout/UIView+Alignment.swift
index affe041..a6e5564 100644
--- a/Paralayout/UIView+Alignment.swift
+++ b/Paralayout/UIView+Alignment.swift
@@ -170,11 +170,13 @@ extension AlignmentContext {
 
 // MARK: -
 
+@MainActor
 private let ParalayoutLog = OSLog(subsystem: "com.squareup.Paralayout", category: "layout")
 
 /// Triggered when an alignment method is called that uses mismatched position types, i.e. aligning a view's leading or
 /// trailing edge to another view's left or right edge, or vice versa. This type of mismatch is likely to look correct
 /// under certain circumstance, but may look incorrect when using a different user interface layout direction.
+@MainActor
 private func ParalayoutAlertForMismatchedAlignmentPositionTypes() {
     os_log(
         "%@",
@@ -190,6 +192,7 @@ private func ParalayoutAlertForMismatchedAlignmentPositionTypes() {
 
 /// Triggered when an alignment method is called that involves two views that are not installed in the same view
 /// hierarchy. The behavior of aligning two views not in the same view hierarchy is undefined.
+@MainActor
 private func ParalayoutAlertForInvalidViewHierarchy() {
     os_log(
         "%@",
diff --git a/Paralayout/UIView+Sizing.swift b/Paralayout/UIView+Sizing.swift
index 465a6f7..b782393 100644
--- a/Paralayout/UIView+Sizing.swift
+++ b/Paralayout/UIView+Sizing.swift
@@ -21,7 +21,7 @@ extension UIView {
     // MARK: - Public Types
 
     /// Constraints on the result of a call to `sizeThatFits(_:)`.
-    public struct SizingConstraints: OptionSet {
+    public struct SizingConstraints: OptionSet, Sendable {
 
         // MARK: - Life Cycle
 
diff --git a/Paralayout/ViewDistributionItem.swift b/Paralayout/ViewDistributionItem.swift
index dae79f8..ee61fae 100644
--- a/Paralayout/ViewDistributionItem.swift
+++ b/Paralayout/ViewDistributionItem.swift
@@ -17,7 +17,7 @@
 import UIKit
 
 /// An element of a horizontal or vertical distribution.
-public enum ViewDistributionItem: ViewDistributionSpecifying {
+public enum ViewDistributionItem: ViewDistributionSpecifying, Sendable {
 
     /// A UIView, with adjustments to how much space it should take up.
     case view(UIView, UIEdgeInsets)
@@ -146,6 +146,7 @@ public enum ViewDistributionItem: ViewDistributionSpecifying {
 // MARK: -
 
 /// A means of getting a `ViewDistributionItem`: either a UIView, or a number as `.fixed` or `.flexible`.
+@MainActor
 public protocol ViewDistributionSpecifying {
 
     var distributionItem: ViewDistributionItem { get }
diff --git a/ParalayoutTests/AngleTests.swift b/ParalayoutTests/AngleTests.swift
index dd031bc..6ce4318 100644
--- a/ParalayoutTests/AngleTests.swift
+++ b/ParalayoutTests/AngleTests.swift
@@ -20,6 +20,7 @@ import XCTest
 
 final class AngleTests: XCTestCase {
 
+    @MainActor
     func testConstants() {
         XCTAssertEqual(Angle.zero.radians, 0)
         XCTAssertEqual(Angle.right.degrees, 90, accuracy: 1e-4)
@@ -27,6 +28,7 @@ final class AngleTests: XCTestCase {
         XCTAssertEqual(Angle.fullCircle.degrees, 360, accuracy: 1e-4)
     }
 
+    @MainActor
     func testValueInitializers() {
         func assertRadianInitPreservesValue(_ radians: CGFloat) {
             XCTAssertEqual(Angle(radians: radians).radians, radians)
@@ -45,6 +47,7 @@ final class AngleTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testPointInitializer() {
         let rect = CGRect(x: -1, y: -1, width: 2, height: 2)
         let centerPoint = Position.center.point(in: rect, layoutDirection: .leftToRight)
@@ -94,6 +97,7 @@ final class AngleTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testPointAtDistance() {
         let rect = CGRect(x: -1, y: -1, width: 2, height: 2)
         let diagonalUnit: CGFloat = sqrt(2)
@@ -151,6 +155,7 @@ final class AngleTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testPositiveNormalization() {
         // In the range [0,2π), the angle should be unmutated.
         XCTAssertEqual(Angle.zero.normalizedPositive.radians, Angle.zero.radians)
@@ -168,6 +173,7 @@ final class AngleTests: XCTestCase {
         XCTAssertEqual(Angle(radians: -.pi / 2).normalizedPositive.radians, 1.5 * .pi, accuracy: 1e-4)
     }
 
+    @MainActor
     func testHalfCircleNormalization() {
         // In the range [-180º,180º), the angle should be unmutated.
         XCTAssertEqual(Angle.zero.normalizedHalfCircle.radians, Angle.zero.radians, accuracy: 1e-4)
diff --git a/ParalayoutTests/AspectRatioTests.swift b/ParalayoutTests/AspectRatioTests.swift
index b3d1614..3d98f39 100644
--- a/ParalayoutTests/AspectRatioTests.swift
+++ b/ParalayoutTests/AspectRatioTests.swift
@@ -20,6 +20,7 @@ import XCTest
 
 final class AspectRatioTests: XCTestCase {
 
+    @MainActor
     func testStatics() {
         XCTAssert(AspectRatio.square.height(forWidth: 1, in: 0) == 1)
         XCTAssert(AspectRatio.square.width(forHeight: 1, in: 0) == 1)
@@ -32,6 +33,7 @@ final class AspectRatioTests: XCTestCase {
         XCTAssert(AspectRatio.widescreen.height(forWidth: 16, in: 0) == 9)
     }
 
+    @MainActor
     func testCreation() {
         XCTAssert(AspectRatio(width: 1, height: 1) == AspectRatio.square)
         XCTAssert(AspectRatio(width: 2, height: 2) == AspectRatio.square)
@@ -43,6 +45,7 @@ final class AspectRatioTests: XCTestCase {
         XCTAssert(CGRect(x: 25, y: 50, width: 100, height: 100).aspectRatio == AspectRatio.square)
     }
 
+    @MainActor
     func testInverted() {
         XCTAssert(AspectRatio.square.inverted == AspectRatio.square)
         XCTAssert(AspectRatio(width: 100, height: 50).inverted == AspectRatio(width: 5, height: 10))
@@ -53,6 +56,7 @@ final class AspectRatioTests: XCTestCase {
         XCTAssert(AspectRatio.widescreen.inverted.height(forWidth: 9, in: 0) == 16)
     }
 
+    @MainActor
     func testComparison() {
         // Aspect ratios in sorted order.
         let ratios = [
@@ -78,6 +82,7 @@ final class AspectRatioTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testSizes() {
         // The core sizing methods round the resulting dimension.
         XCTAssert(AspectRatio.square.width(forHeight: 10.5, in: 1) == 11)
@@ -97,6 +102,7 @@ final class AspectRatioTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testRects() {
         // Use a set of rectangles with varying aspect ratios (square, landscape, portrait; origin offsets;
         // non-integral).
diff --git a/ParalayoutTests/DistributionTests.swift b/ParalayoutTests/DistributionTests.swift
index 2b4695a..03645df 100644
--- a/ParalayoutTests/DistributionTests.swift
+++ b/ParalayoutTests/DistributionTests.swift
@@ -22,6 +22,7 @@ final class DistributionTests: XCTestCase {
 
     // MARK: - Tests - Orthogonal Alignment
 
+    @MainActor
     func testOrthogonalAlignmentInHorizontalDistribution() {
         // The layout direction shouldn't affect the orthogonal alignment in a horizontal distribution.
         for forcedLayoutDirection in [UISemanticContentAttribute.forceLeftToRight, .forceRightToLeft] {
@@ -87,6 +88,7 @@ final class DistributionTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testOrthogonalAlignmentInVerticalDistribution_leftToRightLayout() {
         let container = UIView(frame: .init(x: 0, y: 0, width: 200, height: 1000))
         container.semanticContentAttribute = .forceLeftToRight
@@ -149,6 +151,7 @@ final class DistributionTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testOrthogonalAlignmentInVerticalDistribution_rightToLeftLayout() {
         let container = UIView(frame: .init(x: 0, y: 0, width: 200, height: 1000))
         container.semanticContentAttribute = .forceRightToLeft
diff --git a/ParalayoutTests/GeometryAdditionsTests.swift b/ParalayoutTests/GeometryAdditionsTests.swift
index d189ae7..96303fc 100644
--- a/ParalayoutTests/GeometryAdditionsTests.swift
+++ b/ParalayoutTests/GeometryAdditionsTests.swift
@@ -22,6 +22,7 @@ final class GeometryAdditionsTests: XCTestCase {
 
     // MARK: - Tests - Operators
     
+    @MainActor
     func testOffsetOperators() {
         // Combine offsets.
         XCTAssertEqual(
@@ -66,6 +67,7 @@ final class GeometryAdditionsTests: XCTestCase {
 
     // MARK: - Tests - CGPoint Extensions
 
+    @MainActor
     func testMidpoint() {
         // The midpoint between two of the same point should be that point.
         XCTAssertEqual(CGPoint(midpointBetween: .zero, and: .zero), .zero)
@@ -85,6 +87,7 @@ final class GeometryAdditionsTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testDistanceBetweenPoints() {
         // A point's distance from itself is always zero.
         XCTAssertEqual(CGPoint.zero.distance(to: .zero), 0)
@@ -102,12 +105,14 @@ final class GeometryAdditionsTests: XCTestCase {
 
     // MARK: - Tests - CGSize Extensions
 
+    @MainActor
     func testSizeOfGreatestFiniteMagnitude() {
         let size = CGSize.greatestFiniteMagnitude
         XCTAssertEqual(size.width, .greatestFiniteMagnitude)
         XCTAssertEqual(size.height, .greatestFiniteMagnitude)
     }
 
+    @MainActor
     func testScalingSize() {
         // A zero size scaled by anything should still be zero.
         XCTAssertEqual(CGSize.zero * 100, .zero)
@@ -124,11 +129,13 @@ final class GeometryAdditionsTests: XCTestCase {
 
     // MARK: - Tests - CGRect Extensions
     
+    @MainActor
     func testCGRectCreation() {
         XCTAssertEqual(CGRect(left: 10, top: 10, right: 50, bottom: 50), CGRect(x: 10, y: 10, width: 40, height: 40))
         XCTAssertEqual(CGRect(left: 50, top: 50, right: 10, bottom: 10), CGRect(x: 10, y: 10, width: 40, height: 40))
     }
 
+    @MainActor
     func testCGRectInset() {
         // CGRect.insetBy(left:top:right:bottom:)
         XCTAssertEqual(
@@ -165,6 +172,7 @@ final class GeometryAdditionsTests: XCTestCase {
         )
     }
     
+    @MainActor
     func testCGRectSlice() {
         // CGRect.zero tests
         XCTAssert(CGRect.zero.slice(from: .minXEdge, amount: 0) == (.zero, .zero))
@@ -201,11 +209,13 @@ final class GeometryAdditionsTests: XCTestCase {
 
     // MARK: - Tests - UIEdgeInsets Extensions
 
+    @MainActor
     func testCreateUniformInsets() {
         XCTAssertEqual(UIEdgeInsets(uniform: 20), UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20))
         XCTAssertEqual(UIEdgeInsets(uniformOutset: 20), UIEdgeInsets(top: -20, left: -20, bottom: -20, right: -20))
     }
 
+    @MainActor
     func testCreateInsetsByAxis() {
         XCTAssertEqual(
             UIEdgeInsets(vertical: 10, horizontal: 20),
@@ -213,6 +223,7 @@ final class GeometryAdditionsTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testInsetAmountOnAxis() {
         XCTAssertEqual(UIEdgeInsets(top: 10, left: 20, bottom: 30, right: 40).horizontalAmount, 60)
         XCTAssertEqual(UIEdgeInsets(top: 10, left: 20, bottom: 15, right: 40).verticalAmount, 25)
@@ -223,6 +234,7 @@ final class GeometryAdditionsTests: XCTestCase {
 
     // MARK: - Tests - NSDirectionalEdgeInsets Extensions
 
+    @MainActor
     func testCreateUniformDirectionalInsets() {
         XCTAssertEqual(
             NSDirectionalEdgeInsets(uniform: 20),
@@ -234,6 +246,7 @@ final class GeometryAdditionsTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testCreateDirectionalInsetsByAxis() {
         XCTAssertEqual(
             NSDirectionalEdgeInsets(vertical: 10, horizontal: 20),
@@ -241,6 +254,7 @@ final class GeometryAdditionsTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testDirectionalInsetAmountOnAxis() {
         XCTAssertEqual(NSDirectionalEdgeInsets(top: 10, leading: 20, bottom: 30, trailing: 40).horizontalAmount, 60)
         XCTAssertEqual(NSDirectionalEdgeInsets(top: 10, leading: 20, bottom: 15, trailing: 40).verticalAmount, 25)
diff --git a/ParalayoutTests/InterpolationTests.swift b/ParalayoutTests/InterpolationTests.swift
index 59ea32b..853a769 100644
--- a/ParalayoutTests/InterpolationTests.swift
+++ b/ParalayoutTests/InterpolationTests.swift
@@ -22,6 +22,7 @@ final class InterpolationTests: XCTestCase {
 
     // MARK: - CGRect
 
+    @MainActor
     func testCGRectInterpolation() {
         let startRect = CGRect(x: 1, y: 2, width: 5, height: 6)
         let endRect = CGRect(x: 3, y: 4, width: 7, height: 8)
@@ -33,6 +34,7 @@ final class InterpolationTests: XCTestCase {
 
     // MARK: - Float
 
+    @MainActor
     func testLinearFloatInterpolation_fromMinToMax() {
         let value: Float = 3.0
         let min: Float = 1.0
@@ -43,6 +45,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 3)
     }
 
+    @MainActor
     func testEaseInFloatInterpolation_fromMinToMax() {
         let value: Float = 3.0
         let min: Float = 1.0
@@ -53,6 +56,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 2)
     }
 
+    @MainActor
     func testEaseOutFloatInterpolation_fromMinToMax() {
         let value: Float = 3.0
         let min: Float = 1.0
@@ -63,6 +67,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 4)
     }
 
+    @MainActor
     func testEaseInOutFloatInterpolation_fromMinToMax() {
         let value: Float = 3.0
         let min: Float = 1.0
@@ -73,6 +78,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 3)
     }
 
+    @MainActor
     func testLinearFloatInterpolation_ofUnit() {
         let value: Float = 3.0
         let min: Float = 1.0
@@ -82,6 +88,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 5)
     }
 
+    @MainActor
     func testEaseInFloatInterpolation_ofUnit() {
         let value: Float = 3.0
         let min: Float = 1.0
@@ -91,6 +98,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 5)
     }
 
+    @MainActor
     func testEaseOutFloatInterpolation_ofUnit() {
         let value: Float = 3.0
         let min: Float = 1.0
@@ -100,6 +108,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 5)
     }
 
+    @MainActor
     func testEaseInOutFloatInterpolation_ofUnit() {
         let value: Float = 3.0
         let min: Float = 1.0
@@ -109,6 +118,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 5)
     }
 
+    @MainActor
     func testLinearFloatInterpolation_fromMinToMax_withMidpoint() {
         let value: Float = 3.0
         let min: Float = 1.0
@@ -120,6 +130,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 2)
     }
 
+    @MainActor
     func testEaseInFloatInterpolation_fromMinToMax_withMidpoint() {
         let value: Float = 3.0
         let min: Float = 1.0
@@ -131,6 +142,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 2)
     }
 
+    @MainActor
     func testEaseOutFloatInterpolation_fromMinToMax_withMidpoint() {
         let value: Float = 3.0
         let min: Float = 1.0
@@ -142,6 +154,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 2)
     }
 
+    @MainActor
     func testEaseInOutFloatInterpolation_fromMinToMax_withMidpoint() {
         let value: Float = 3.0
         let min: Float = 1.0
@@ -155,6 +168,7 @@ final class InterpolationTests: XCTestCase {
 
     // MARK: - Double
 
+    @MainActor
     func testLinearDoubleInterpolation_fromMinToMax() {
         let value: Double = 3.0
         let min: Double = 1.0
@@ -165,6 +179,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 3)
     }
 
+    @MainActor
     func testEaseInDoubleInterpolation_fromMinToMax() {
         let value: Double = 3.0
         let min: Double = 1.0
@@ -175,6 +190,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 2)
     }
 
+    @MainActor
     func testEaseOutDoubleInterpolation_fromMinToMax() {
         let value: Double = 3.0
         let min: Double = 1.0
@@ -185,6 +201,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 4)
     }
 
+    @MainActor
     func testEaseInOutDoubleInterpolation_fromMinToMax() {
         let value: Double = 3.0
         let min: Double = 1.0
@@ -195,6 +212,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 3)
     }
 
+    @MainActor
     func testLinearDoubleInterpolation_ofUnit() {
         let value: Double = 3.0
         let min: Double = 1.0
@@ -204,6 +222,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 5)
     }
 
+    @MainActor
     func testEaseInDoubleInterpolation_ofUnit() {
         let value: Double = 3.0
         let min: Double = 1.0
@@ -213,6 +232,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 5)
     }
 
+    @MainActor
     func testEaseOutDoubleInterpolation_ofUnit() {
         let value: Double = 3.0
         let min: Double = 1.0
@@ -222,6 +242,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 5)
     }
 
+    @MainActor
     func testEaseInOutDoubleInterpolation_ofUnit() {
         let value: Double = 3.0
         let min: Double = 1.0
@@ -231,6 +252,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 5)
     }
 
+    @MainActor
     func testLinearDoubleInterpolation_fromMinToMax_withMidpoint() {
         let value: Double = 3.0
         let min: Double = 1.0
@@ -242,6 +264,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 2)
     }
 
+    @MainActor
     func testEaseInDoubleInterpolation_fromMinToMax_withMidpoint() {
         let value: Double = 3.0
         let min: Double = 1.0
@@ -253,6 +276,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 2)
     }
 
+    @MainActor
     func testEaseOutDoubleInterpolation_fromMinToMax_withMidpoint() {
         let value: Double = 3.0
         let min: Double = 1.0
@@ -264,6 +288,7 @@ final class InterpolationTests: XCTestCase {
         XCTAssertEqual(interpolation, 2)
     }
 
+    @MainActor
     func testEaseInOutDoubleInterpolation_fromMinToMax_withMidpoint() {
         let value: Double = 3.0
         let min: Double = 1.0
diff --git a/ParalayoutTests/PixelRoundingTests.swift b/ParalayoutTests/PixelRoundingTests.swift
index d1f90e1..5cc4178 100644
--- a/ParalayoutTests/PixelRoundingTests.swift
+++ b/ParalayoutTests/PixelRoundingTests.swift
@@ -20,23 +20,9 @@ import XCTest
 
 final class PixelRoundingTests: XCTestCase {
 
-    // MARK: - Private Types
-
-    private enum Samples {
-        static let window = UIWindow(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
-        static let view = UIView()
-    }
-
-    // MARK: - XCTest
-
-    override func setUp() {
-        super.setUp()
-
-        Samples.window.addSubview(Samples.view)
-    }
-
     // MARK: - Tests - Pixel Rounding
 
+    @MainActor
     func testFloatPixelRounding() {
         XCTAssertEqual(CGFloat(1.75).flooredToPixel(in: 0), 1.75)
         XCTAssertEqual(CGFloat(1.75).flooredToPixel(in: TestScreen.at1x), 1)
@@ -57,6 +43,7 @@ final class PixelRoundingTests: XCTestCase {
         XCTAssertEqual(CGFloat(-1.75).ceiledToPixel(in: TestScreen.at2x), -1.5)
     }
 
+    @MainActor
     func testPointPixelRounding() {
         XCTAssertEqual(CGPoint(x: 0.9, y: -1.1).flooredToPixel(in: 0), CGPoint(x: 0.9, y: -1.1))
         XCTAssertEqual(CGPoint(x: 0.9, y: -1.1).flooredToPixel(in: 1), CGPoint(x: 0, y: -2))
@@ -71,6 +58,7 @@ final class PixelRoundingTests: XCTestCase {
         XCTAssertEqual(CGPoint(x: 0.4, y: -1.4).roundedToPixel(in: 2), CGPoint(x: 0.5, y: -1.5))
     }
 
+    @MainActor
     func testSizePixelRounding() {
         XCTAssertEqual(CGSize(width: 0.9, height: -1.1).flooredToPixel(in: 0), CGSize(width: 0.9, height: -1.1))
         XCTAssertEqual(CGSize(width: 0.9, height: -1.1).flooredToPixel(in: 1), CGSize(width: 0, height: -2))
@@ -85,6 +73,7 @@ final class PixelRoundingTests: XCTestCase {
         XCTAssertEqual(CGSize(width: 0.4, height: -1.4).roundedToPixel(in: 2), CGSize(width: 0.5, height: -1.5))
     }
 
+    @MainActor
     func testRectPixelRounding() {
         XCTAssertEqual(
             CGRect(left: 10.6, top: 10.4, right: 50.6, bottom: 50.6).expandedToPixel(in: TestScreen.at2x),
@@ -105,31 +94,4 @@ final class PixelRoundingTests: XCTestCase {
         )
     }
 
-    // MARK: - Tests - Scale Factor
-
-    func testViewScaleFactor() {
-        // A view should inherit the scale factor of its parent screen.
-        for screen in screensToTest() {
-            Samples.window.screen = screen
-            XCTAssertEqual(Samples.view.pixelsPerPoint, screen.pixelsPerPoint)
-        }
-
-        // With no superview, the main screen's scale should be used.
-        Samples.view.removeFromSuperview()
-        XCTAssert(Samples.view.pixelsPerPoint == UIScreen.main.pixelsPerPoint)
-    }
-
-    // MARK: - Private Methods
-
-    private func screensToTest() -> [UIScreen] {
-        if #available(iOS 13, *) {
-            // In iOS 13 and later, there is a bug around setting `UIWindow.screen` that prevents us from testing
-            // multiple screens (FB8674601).
-            return [.main]
-
-        } else {
-            return TestScreen.all
-        }
-    }
-
 }
diff --git a/ParalayoutTests/PositionTests.swift b/ParalayoutTests/PositionTests.swift
index e7b297d..5345851 100644
--- a/ParalayoutTests/PositionTests.swift
+++ b/ParalayoutTests/PositionTests.swift
@@ -20,6 +20,7 @@ import XCTest
 
 final class PositionTests: XCTestCase {
 
+    @MainActor
     func testResolvePositionsInLeftToRightLayout() {
         func resolve(_ position: Position) -> ResolvedPosition {
             return ResolvedPosition(resolving: position, with: .leftToRight)
@@ -45,6 +46,7 @@ final class PositionTests: XCTestCase {
         XCTAssertEqual(resolve(.bottomTrailing), .bottomRight)
     }
 
+    @MainActor
     func testResolvePositionsInRightToLeftLayout() {
         func resolve(_ position: Position) -> ResolvedPosition {
             return ResolvedPosition(resolving: position, with: .rightToLeft)
diff --git a/ParalayoutTests/UIViewFrameTests.swift b/ParalayoutTests/UIViewFrameTests.swift
index 5826351..8a88c13 100644
--- a/ParalayoutTests/UIViewFrameTests.swift
+++ b/ParalayoutTests/UIViewFrameTests.swift
@@ -23,6 +23,7 @@ final class UIViewFrameTests: XCTestCase {
 
     // MARK: - Tests
 
+    @MainActor
     func testUntransformedFrameGetter_simpleFrames() {
         let view = UIView()
 
@@ -36,6 +37,7 @@ final class UIViewFrameTests: XCTestCase {
         assertUntransformedFrameIsAccurate(for: view)
     }
 
+    @MainActor
     func testUntransformedFrameSetter_simpleFrames() {
         let view = UIView()
 
@@ -44,6 +46,7 @@ final class UIViewFrameTests: XCTestCase {
         XCTAssertEqual(view.untransformedFrame, newValue)
     }
 
+    @MainActor
     func testUntransformedFrameGetter_nonIdentityTransform() {
         let view = UIView(frame: CGRect(x: 10, y: 20, width: 30, height: 40))
 
@@ -54,6 +57,7 @@ final class UIViewFrameTests: XCTestCase {
         assertUntransformedFrameIsAccurate(for: view)
     }
 
+    @MainActor
     func testUntransformedFrameSetter_nonIdentityTransform() {
         let view = UIView(frame: CGRect(x: 10, y: 20, width: 30, height: 40))
 
@@ -66,6 +70,7 @@ final class UIViewFrameTests: XCTestCase {
         XCTAssertEqual(view.transform, transform)
     }
 
+    @MainActor
     func testUntransformedFrameGetter_nonCenterAnchorPoint() {
         let view = UIView(frame: CGRect(x: 10, y: 20, width: 30, height: 40))
 
@@ -76,6 +81,7 @@ final class UIViewFrameTests: XCTestCase {
         assertUntransformedFrameIsAccurate(for: view)
     }
 
+    @MainActor
     func testUntransformedFrameSetter_nonCenterAnchorPoint() {
         let view = UIView(frame: CGRect(x: 10, y: 20, width: 30, height: 40))
 
@@ -88,6 +94,7 @@ final class UIViewFrameTests: XCTestCase {
         XCTAssertEqual(view.layer.anchorPoint, anchorPoint)
     }
 
+    @MainActor
     func testUntransformedFrameGetter_nonZeroOriginBounds() {
         let view = UIView(frame: CGRect(x: 10, y: 20, width: 30, height: 40))
 
@@ -95,6 +102,7 @@ final class UIViewFrameTests: XCTestCase {
         assertUntransformedFrameIsAccurate(for: view)
     }
 
+    @MainActor
     func testUntransformedFrameSetter_nonZeroOriginBounds() {
         let view = UIView(frame: CGRect(x: 10, y: 20, width: 30, height: 40))
 
@@ -107,6 +115,7 @@ final class UIViewFrameTests: XCTestCase {
         XCTAssertEqual(view.bounds.origin, boundsOrigin)
     }
 
+    @MainActor
     func testUntransformedConvert_siblingViews() throws {
         let window = UIWindow(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
 
@@ -139,6 +148,7 @@ final class UIViewFrameTests: XCTestCase {
         try assertUntransformedConvertIsAccurate(for: CGPoint(x: 2, y: 3), in: view2, convertedTo: view1)
     }
 
+    @MainActor
     func testUntransformedConvert_verticalHierarchy() throws {
         let view1 = UIView(frame: CGRect(x: 1, y: 2, width: 10, height: 10))
 
@@ -155,6 +165,7 @@ final class UIViewFrameTests: XCTestCase {
         try assertUntransformedConvertIsAccurate(for: CGPoint(x: -7, y: 8), in: view3, convertedTo: view1)
     }
 
+    @MainActor
     func testUntransformedConvert_nonZeroBounds() throws {
         let window = UIWindow(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
 
@@ -176,6 +187,7 @@ final class UIViewFrameTests: XCTestCase {
         try assertUntransformedConvertIsAccurate(for: CGPoint(x: 1, y: 2), in: view2, convertedTo: view3)
     }
 
+    @MainActor
     func testUntransformedConvert_nonIdentityTransforms() throws {
         let view1 = UIView(frame: CGRect(x: 1, y: 2, width: 10, height: 10))
         view1.transform = .init(rotationAngle: 0.1)
@@ -202,6 +214,7 @@ final class UIViewFrameTests: XCTestCase {
 
     // MARK: - Private Helper Methods
 
+    @MainActor
     func assertUntransformedFrameIsAccurate(for view: UIView, file: StaticString = #file, line: UInt = #line) {
         let actualValue = view.untransformedFrame
 
@@ -213,6 +226,7 @@ final class UIViewFrameTests: XCTestCase {
         view.layer.transform = originalTransform
     }
 
+    @MainActor
     func assertUntransformedConvertIsAccurate(
         for point: CGPoint,
         in sourceView: UIView,
diff --git a/ParalayoutTests/UIViewSizingTests.swift b/ParalayoutTests/UIViewSizingTests.swift
index 4d8531e..7de01a5 100644
--- a/ParalayoutTests/UIViewSizingTests.swift
+++ b/ParalayoutTests/UIViewSizingTests.swift
@@ -22,6 +22,7 @@ final class UIViewSizingTests: XCTestCase {
 
     // MARK: - Tests - Size That Fits
 
+    @MainActor
     func testSizeThatFitsWithNoConstraints() {
         let testView = TestView(sizeThatFits: .init(width: 300, height: 200))
 
@@ -31,6 +32,7 @@ final class UIViewSizingTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testSizeThatFitsWithMaxWidthConstraints() {
         let testView = TestView(sizeThatFits: .init(width: 300, height: 200))
 
@@ -40,6 +42,7 @@ final class UIViewSizingTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testSizeThatFitsWithMaxHeightConstraints() {
         let testView = TestView(sizeThatFits: .init(width: 300, height: 200))
 
@@ -49,6 +52,7 @@ final class UIViewSizingTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testSizeThatFitsWithMaxSizeConstraints() {
         let testView = TestView(sizeThatFits: .init(width: 300, height: 200))
 
@@ -58,6 +62,7 @@ final class UIViewSizingTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testSizeThatFitsWithMinWidthConstraints() {
         let testView = TestView(sizeThatFits: .init(width: 300, height: 200))
 
@@ -67,6 +72,7 @@ final class UIViewSizingTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testSizeThatFitsWithMinHeightConstraints() {
         let testView = TestView(sizeThatFits: .init(width: 300, height: 200))
 
@@ -76,6 +82,7 @@ final class UIViewSizingTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testSizeThatFitsWithMinSizeConstraints() {
         let testView = TestView(sizeThatFits: .init(width: 300, height: 200))
 
@@ -87,6 +94,7 @@ final class UIViewSizingTests: XCTestCase {
 
     // MARK: - Tests - Size To Fit
 
+    @MainActor
     func testSizeToFitWithNoConstraints() {
         let testView = TestView(sizeThatFits: .init(width: 300, height: 200))
         testView.sizeToFit(.zero)
@@ -97,6 +105,7 @@ final class UIViewSizingTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testSizeToFitWithMaxSizeConstraints() {
         let testView = TestView(sizeThatFits: .init(width: 300, height: 200))
         testView.sizeToFit(.init(width: 100, height: 50), constraints: .maxSize)
@@ -107,6 +116,7 @@ final class UIViewSizingTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testSizeToFitWithTransform() {
         let testView = TestView(sizeThatFits: .init(width: 300, height: 200))
         testView.transform = .init(scaleX: 2, y: 2)
@@ -117,6 +127,7 @@ final class UIViewSizingTests: XCTestCase {
         XCTAssertEqual(testView.frame.size, .init(width: 200, height: 100))
     }
 
+    @MainActor
     func testSizeToFitWithNegativeWidth() {
         let testView = TestView(sizeThatFits: .init(width: -50, height: 200))
         testView.sizeToFit(.init(width: 100, height: 50))
@@ -124,6 +135,7 @@ final class UIViewSizingTests: XCTestCase {
         XCTAssertEqual(testView.bounds.size, .init(width: 0, height: 200))
     }
 
+    @MainActor
     func testSizeToFitWithNegativeHeight() {
         let testView = TestView(sizeThatFits: .init(width: 200, height: -50))
         testView.sizeToFit(.init(width: 100, height: 50))
diff --git a/ParalayoutTests/ViewArrayBuilderTests.swift b/ParalayoutTests/ViewArrayBuilderTests.swift
index 7f1f92d..921642d 100644
--- a/ParalayoutTests/ViewArrayBuilderTests.swift
+++ b/ParalayoutTests/ViewArrayBuilderTests.swift
@@ -22,6 +22,7 @@ final class ViewArrayBuilderTests: XCTestCase {
 
     // MARK: - Tests
 
+    @MainActor
     func testSimpleResultBuilder() throws {
         let view1 = UIView()
         let view2 = UIView()
@@ -37,6 +38,7 @@ final class ViewArrayBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testIfTrueResultBuilder() throws {
         let view1 = UIView()
         let view2 = UIView()
@@ -58,6 +60,7 @@ final class ViewArrayBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testIfFalseResultBuilder() throws {
         let view1 = UIView()
         let view2 = UIView()
@@ -78,6 +81,7 @@ final class ViewArrayBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testIfElseFirstBranchResultBuilder() throws {
         let view1 = UIView()
         let view2 = UIView()
@@ -102,6 +106,7 @@ final class ViewArrayBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testIfElseSecondBranchResultBuilder() throws {
         let view1 = UIView()
         let view2 = UIView()
@@ -126,6 +131,7 @@ final class ViewArrayBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testSwitchCaseResultBuilder() throws {
         let view1 = UIView()
         let view2 = UIView()
@@ -150,6 +156,7 @@ final class ViewArrayBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testSwitchDefaultResultBuilder() throws {
         let view1 = UIView()
         let view2 = UIView()
@@ -173,6 +180,7 @@ final class ViewArrayBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testForLoopResultBuilder() throws {
         let views = [UIView(), UIView(), UIView()]
         XCTAssertEqual(
@@ -187,6 +195,7 @@ final class ViewArrayBuilderTests: XCTestCase {
 
     // MARK: - Private Methods
 
+    @MainActor
     private func viewArray(@ViewArrayBuilder _ builder: () -> [UIView]) -> [UIView] {
         builder()
     }
diff --git a/ParalayoutTests/ViewDistributionBuilderTests.swift b/ParalayoutTests/ViewDistributionBuilderTests.swift
index ba2288d..8937188 100644
--- a/ParalayoutTests/ViewDistributionBuilderTests.swift
+++ b/ParalayoutTests/ViewDistributionBuilderTests.swift
@@ -22,6 +22,7 @@ final class ViewDistributionBuilderTests: XCTestCase {
 
     // MARK: - Tests
 
+    @MainActor
     func testSimpleResultBuilder() throws {
         let view = UIView()
         XCTAssertEqual(
@@ -38,6 +39,7 @@ final class ViewDistributionBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testIfTrueResultBuilder() throws {
         let view = UIView()
         let condition = true
@@ -57,6 +59,7 @@ final class ViewDistributionBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testIfFalseResultBuilder() throws {
         let view = UIView()
         let condition = false
@@ -75,6 +78,7 @@ final class ViewDistributionBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testIfElseFirstBranchResultBuilder() throws {
         let view = UIView()
         view.tag = 1
@@ -99,6 +103,7 @@ final class ViewDistributionBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testIfElseSecondBranchResultBuilder() throws {
         let view = UIView()
         view.tag = 1
@@ -123,6 +128,7 @@ final class ViewDistributionBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testSwitchCaseResultBuilder() throws {
         let view = UIView()
         let value = 1
@@ -145,6 +151,7 @@ final class ViewDistributionBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testSwitchDefaultResultBuilder() throws {
         let view = UIView()
         let value = 2
@@ -166,6 +173,7 @@ final class ViewDistributionBuilderTests: XCTestCase {
         )
     }
 
+    @MainActor
     func testForLoopResultBuilder() throws {
         XCTAssertEqual(
             viewDistribution({
@@ -185,6 +193,7 @@ final class ViewDistributionBuilderTests: XCTestCase {
 
     // MARK: - Private Methods
 
+    @MainActor
     private func viewDistribution(@ViewDistributionBuilder _ builder: () -> [ViewDistributionSpecifying]) -> [ViewDistributionSpecifying] {
         builder()
     }
@@ -192,6 +201,7 @@ final class ViewDistributionBuilderTests: XCTestCase {
 #endif
 
 extension ViewDistributionItem: Equatable {
+    nonisolated
     public static func == (lhs: ViewDistributionItem, rhs: ViewDistributionItem) -> Bool {
         switch (lhs, rhs) {
         case let (.view(lhsView, lhsEdgeInsets), .view(rhsView, rhsEdgeInsets)):
diff --git a/README.md b/README.md
index a636098..bd0de8d 100644
--- a/README.md
+++ b/README.md
@@ -156,9 +156,9 @@ The extra space within a label above the "cap height" and below the "baseline" o
 
 ## Requirements
 
-* iOS 12.0 or later
-* Xcode 12.0 or later
-* Swift 5.0
+* iOS 13.0 or later
+* Xcode 15.0 or later
+* Swift 5.9
 
 
 ## Contributing
diff --git a/Scripts/build.swift b/Scripts/build.swift
index d53a95c..56af8ce 100755
--- a/Scripts/build.swift
+++ b/Scripts/build.swift
@@ -46,24 +46,15 @@ enum TaskError: Error {
 }
 
 enum Platform: String, CustomStringConvertible {
-	case iOS_16
-	case iOS_15
-	case iOS_14
-	case iOS_13
-	case iOS_12
+	case iOS_17
+	case iPadOS_17
 
 	var destination: String {
 		switch self {
-		case .iOS_16:
-			return "platform=iOS Simulator,OS=16.1,name=iPhone 14 Pro"
-		case .iOS_15:
-			return "platform=iOS Simulator,OS=15.5,name=iPhone 13 Pro"
-		case .iOS_14:
-			return "platform=iOS Simulator,OS=14.4,name=iPhone 12 Pro"
-		case .iOS_13:
-			return "platform=iOS Simulator,OS=13.7,name=iPhone 11 Pro"
-		case .iOS_12:
-			return "platform=iOS Simulator,OS=12.4,name=iPhone 5s"
+		case .iOS_17:
+			return "platform=iOS Simulator,OS=17.5,name=iPhone 15 Pro"
+		case .iPadOS_17:
+			return "platform=iOS Simulator,OS=17.5,name=iPad (10th generation)"
 		}
 	}
 
diff --git a/Scripts/github/prepare-simulators.sh b/Scripts/github/prepare-simulators.sh
deleted file mode 100755
index cb2e74c..0000000
--- a/Scripts/github/prepare-simulators.sh
+++ /dev/null
@@ -1,24 +0,0 @@
-#!/bin/bash -l
-set -ex
-
-sudo mkdir -p /Library/Developer/CoreSimulator/Profiles/Runtimes
-
-case $1 in
-	iOS_12)
-		sudo ln -s /Applications/Xcode_10.3.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime /Library/Developer/CoreSimulator/Profiles/Runtimes/iOS\ 12.4.simruntime
-		;;
-
-	iOS_13)
-		sudo ln -s /Applications/Xcode_11.7.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime /Library/Developer/CoreSimulator/Profiles/Runtimes/iOS\ 13.7.simruntime
-		;;
-
-	iOS_14)
-		sudo ln -s /Applications/Xcode_12.4.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime /Library/Developer/CoreSimulator/Profiles/Runtimes/iOS\ 14.4.simruntime
-		;;
-
-	iOS_15)
-		sudo ln -s /Applications/Xcode_13.4.1.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime /Library/Developer/CoreSimulator/Profiles/Runtimes/iOS\ 15.5.simruntime
-		;;
-esac
-
-xcrun simctl list runtimes