diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3eda50457..2f455ec7e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,6 +18,9 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          - swift: "6"
+            xcode: "26.0.1"
+            runs-on: macos-15
           - swift: "5"
             xcode: "16.4"
             runs-on: macos-15
diff --git a/Examples/Maps-SwiftUI/Maps-SwiftUI.xcodeproj/project.pbxproj b/Examples/Maps-SwiftUI/Maps-SwiftUI.xcodeproj/project.pbxproj
index 1163657ec..59f24c707 100644
--- a/Examples/Maps-SwiftUI/Maps-SwiftUI.xcodeproj/project.pbxproj
+++ b/Examples/Maps-SwiftUI/Maps-SwiftUI.xcodeproj/project.pbxproj
@@ -234,6 +234,7 @@
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -295,6 +296,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
diff --git a/Examples/Maps/Maps.xcodeproj/project.pbxproj b/Examples/Maps/Maps.xcodeproj/project.pbxproj
index 1e3c59dec..47ab2156e 100644
--- a/Examples/Maps/Maps.xcodeproj/project.pbxproj
+++ b/Examples/Maps/Maps.xcodeproj/project.pbxproj
@@ -248,6 +248,7 @@
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -310,6 +311,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
@@ -346,7 +348,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = example.Maps;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -369,7 +371,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = example.Maps;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
diff --git a/Examples/Maps/Maps/AppDelegate.swift b/Examples/Maps/Maps/AppDelegate.swift
index 57b82957b..1d5659182 100644
--- a/Examples/Maps/Maps/AppDelegate.swift
+++ b/Examples/Maps/Maps/AppDelegate.swift
@@ -2,7 +2,7 @@
 
 import UIKit
 
-@UIApplicationMain
+@main
 class AppDelegate: UIResponder, UIApplicationDelegate {
     var window: UIWindow?
 }
diff --git a/Examples/Maps/Maps/MainViewController.swift b/Examples/Maps/Maps/MainViewController.swift
index dd8d54c3e..73ea65c08 100644
--- a/Examples/Maps/Maps/MainViewController.swift
+++ b/Examples/Maps/Maps/MainViewController.swift
@@ -310,7 +310,7 @@ class SearchPanelPadLayout: FloatingPanelLayout {
     }
 }
 
-class SearchPaneliPadBehavior: FloatingPanelBehavior {
+final class SearchPaneliPadBehavior: FloatingPanelBehavior {
     var springDecelerationRate: CGFloat {
         return UIScrollView.DecelerationRate.fast.rawValue - 0.003
     }
diff --git a/Examples/Samples/Samples.xcodeproj/project.pbxproj b/Examples/Samples/Samples.xcodeproj/project.pbxproj
index 3ddace285..90ebe43d7 100644
--- a/Examples/Samples/Samples.xcodeproj/project.pbxproj
+++ b/Examples/Samples/Samples.xcodeproj/project.pbxproj
@@ -340,6 +340,7 @@
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -402,6 +403,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
diff --git a/Examples/Samples/Sources/Base.lproj/Main.storyboard b/Examples/Samples/Sources/Base.lproj/Main.storyboard
index 25e176b56..e7ae157e6 100644
--- a/Examples/Samples/Sources/Base.lproj/Main.storyboard
+++ b/Examples/Samples/Sources/Base.lproj/Main.storyboard
@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="32700.99.1234" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="RoN-h0-uBD">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="24128" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="RoN-h0-uBD">
     <device id="retina6_1" orientation="portrait" appearance="light"/>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="22685"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="24063"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="Stack View standard spacing" minToolsVersion="9.0"/>
         <capability name="System colors in document resources" minToolsVersion="11.0"/>
@@ -15,7 +15,6 @@
             <objects>
                 <navigationController storyboardIdentifier="RootNavigationController" id="RoN-h0-uBD" sceneMemberID="viewController">
                     <navigationBar key="navigationBar" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" largeTitles="YES" id="hNW-5m-Omi">
-                        <rect key="frame" x="0.0" y="48" width="414" height="96"/>
                         <autoresizingMask key="autoresizingMask"/>
                     </navigationBar>
                     <connections>
@@ -87,7 +86,7 @@
             <objects>
                 <viewController storyboardIdentifier="SettingsViewController" id="C1X-9Z-TyQ" customClass="SettingsViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" id="af9-Zr-Ppc">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="197.5"/>
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="fillProportionally" spacing="16" translatesAutoresizingMaskIntoConstraints="NO" id="n93-ZL-fmC">
@@ -270,7 +269,7 @@
             <objects>
                 <viewController storyboardIdentifier="IntrinsicViewController" title="Intrinsic View Controller" id="aK0-kv-mTu" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="eLM-xc-d9e">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="1000" verticalHuggingPriority="1000" horizontalCompressionResistancePriority="1000" verticalCompressionResistancePriority="1000" text="Change this text" textAlignment="center" lineBreakMode="tailTruncation" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="ge4-RW-Gmz">
@@ -299,7 +298,7 @@
             <objects>
                 <viewController storyboardIdentifier="ImageViewController" id="VWY-cF-RoY" customClass="ImageViewController" customModule="Samples" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="dAf-gD-ghB">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" translatesAutoresizingMaskIntoConstraints="NO" id="Gs4-S6-Goh">
@@ -383,7 +382,7 @@
             <objects>
                 <viewController storyboardIdentifier="ModalViewController" id="bYI-y3-Rzb" customClass="ModalViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="qwo-GK-p1U">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="768"/>
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="vut-mK-Y4t" customClass="SafeAreaView" customModule="Samples" customModuleProvider="target">
@@ -465,7 +464,7 @@
             <objects>
                 <viewController storyboardIdentifier="NestedScrollViewController" id="LAe-jm-k6f" customClass="NestedScrollViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="414-Wy-0t1">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <scrollView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="sBe-tN-uMi">
@@ -587,7 +586,7 @@
             <objects>
                 <viewController storyboardIdentifier="DetailViewController" id="YC8-ae-15L" customClass="DetailViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="g7l-kO-y7q">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="8yw-OC-Ubk">
@@ -713,7 +712,7 @@
             <objects>
                 <viewController storyboardIdentifier="ConsoleViewController" id="tvD-nO-QUb" customClass="DebugTextViewController" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="9YG-0j-Zzg">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <textView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" showsHorizontalScrollIndicator="NO" bouncesZoom="NO" editable="NO" textAlignment="natural" selectable="NO" translatesAutoresizingMaskIntoConstraints="NO" id="rN1-HL-YHv">
@@ -806,7 +805,7 @@ Section 1.10.33 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC
             <objects>
                 <viewController storyboardIdentifier="TableViewControllerForAdaptiveLayout" id="5nC-6E-bXf" customClass="TableViewControllerForAdaptiveLayout" customModule="Samples" customModuleProvider="target" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="jXL-Ss-NCJ">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="778"/>
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" showsHorizontalScrollIndicator="NO" showsVerticalScrollIndicator="NO" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="W7W-ET-Wco" customClass="IntrinsicTableView" customModule="Samples" customModuleProvider="target">
@@ -847,11 +846,6 @@ Section 1.10.33 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC
             <point key="canvasLocation" x="4005" y="734"/>
         </scene>
     </scenes>
-    <designables>
-        <designable name="noi-1a-5bZ">
-            <size key="intrinsicContentSize" width="30" height="30"/>
-        </designable>
-    </designables>
     <inferredMetricsTieBreakers>
         <segue reference="r1P-2i-NDe"/>
     </inferredMetricsTieBreakers>
diff --git a/Examples/Samples/Sources/ContentViewControllers/TabBarViewController.swift b/Examples/Samples/Sources/ContentViewControllers/TabBarViewController.swift
index a6e177065..3723a0a20 100644
--- a/Examples/Samples/Sources/ContentViewControllers/TabBarViewController.swift
+++ b/Examples/Samples/Sources/ContentViewControllers/TabBarViewController.swift
@@ -203,7 +203,7 @@ class TwoTabBarPanelLayout: FloatingPanelLayout {
     ]
 }
 
-class TwoTabBarPanelBehavior: FloatingPanelBehavior {
+final class TwoTabBarPanelBehavior: FloatingPanelBehavior {
     func allowsRubberBanding(for edges: UIRectEdge) -> Bool {
         return [UIRectEdge.top, UIRectEdge.bottom].contains(edges)
     }
diff --git a/Examples/Samples/Sources/UseCases/UseCaseController.swift b/Examples/Samples/Sources/UseCases/UseCaseController.swift
index f1a52d61d..89c337769 100644
--- a/Examples/Samples/Sources/UseCases/UseCaseController.swift
+++ b/Examples/Samples/Sources/UseCases/UseCaseController.swift
@@ -3,6 +3,7 @@
 import UIKit
 import FloatingPanel
 
+@MainActor
 final class UseCaseController: NSObject {
     unowned let mainVC: MainViewController
     private(set) var useCase: UseCase
@@ -332,8 +333,8 @@ extension UseCaseController {
                         effectView.alpha
                     }
                 }
-                override init() {
-                    super.init()
+                override init(frame: CGRect = .zero) {
+                    super.init(frame: frame)
 
                     let effect = UIBlurEffect(style: .prominent)
                     let effectView = UIVisualEffectView(effect: effect)
@@ -489,8 +490,9 @@ private extension FloatingPanelController {
             track(scrollView: consoleVC.textView)
 
         case let contentVC as DebugTableViewController:
-            let ob = contentVC.tableView.observe(\.isEditing) { [weak self] (tableView, _) in
-                self?.panGestureRecognizer.isEnabled = !tableView.isEditing
+            nonisolated(unsafe) let panGestureRecognizer = panGestureRecognizer
+            let ob = contentVC.tableView.observe(\.isEditing) { (tableView, _) in
+                panGestureRecognizer.isEnabled = !tableView.isEditing
             }
             contentVC.kvoObservers.append(ob)
             track(scrollView: contentVC.tableView)
diff --git a/Examples/SamplesObjC/SamplesObjC.xcodeproj/project.pbxproj b/Examples/SamplesObjC/SamplesObjC.xcodeproj/project.pbxproj
index 346599ab6..87187cb68 100644
--- a/Examples/SamplesObjC/SamplesObjC.xcodeproj/project.pbxproj
+++ b/Examples/SamplesObjC/SamplesObjC.xcodeproj/project.pbxproj
@@ -240,6 +240,7 @@
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -300,6 +301,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
diff --git a/Examples/Stocks/Stocks.xcodeproj/project.pbxproj b/Examples/Stocks/Stocks.xcodeproj/project.pbxproj
index c5bb1f6cb..0ba0ffa3a 100644
--- a/Examples/Stocks/Stocks.xcodeproj/project.pbxproj
+++ b/Examples/Stocks/Stocks.xcodeproj/project.pbxproj
@@ -232,6 +232,7 @@
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -294,6 +295,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
diff --git a/Examples/Stocks/Stocks/MainViewController.swift b/Examples/Stocks/Stocks/MainViewController.swift
index b0c89a16b..1d2365503 100644
--- a/Examples/Stocks/Stocks/MainViewController.swift
+++ b/Examples/Stocks/Stocks/MainViewController.swift
@@ -115,7 +115,7 @@ class FloatingPanelStocksLayout: FloatingPanelLayout {
 
 // MARK: - FloatingPanelBehavior
 
-class FloatingPanelStocksBehavior: FloatingPanelBehavior {
+final class FloatingPanelStocksBehavior: FloatingPanelBehavior {
     let springDecelerationRate: CGFloat = UIScrollView.DecelerationRate.fast.rawValue
     let springResponseTime: CGFloat = 0.25
 }
diff --git a/FloatingPanel.xcodeproj/project.pbxproj b/FloatingPanel.xcodeproj/project.pbxproj
index 7d9486d09..f32adac3d 100644
--- a/FloatingPanel.xcodeproj/project.pbxproj
+++ b/FloatingPanel.xcodeproj/project.pbxproj
@@ -421,6 +421,7 @@
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -487,6 +488,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
@@ -536,7 +538,20 @@
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 5.0;
+				SWIFT_STRICT_CONCURRENCY = complete;
+				SWIFT_UPCOMING_FEATURE_CONCISE_MAGIC_FILE = YES;
+				SWIFT_UPCOMING_FEATURE_DEPRECATE_APPLICATION_MAIN = YES;
+				SWIFT_UPCOMING_FEATURE_DISABLE_OUTWARD_ACTOR_ISOLATION = YES;
+				SWIFT_UPCOMING_FEATURE_EXISTENTIAL_ANY = YES;
+				SWIFT_UPCOMING_FEATURE_FORWARD_TRAILING_CLOSURES = YES;
+				SWIFT_UPCOMING_FEATURE_GLOBAL_CONCURRENCY = YES;
+				SWIFT_UPCOMING_FEATURE_IMPLICIT_OPEN_EXISTENTIALS = YES;
+				SWIFT_UPCOMING_FEATURE_IMPORT_OBJC_FORWARD_DECLS = YES;
+				SWIFT_UPCOMING_FEATURE_INFER_SENDABLE_FROM_CAPTURES = YES;
+				SWIFT_UPCOMING_FEATURE_INTERNAL_IMPORTS_BY_DEFAULT = YES;
+				SWIFT_UPCOMING_FEATURE_ISOLATED_DEFAULT_VALUES = YES;
+				SWIFT_UPCOMING_FEATURE_REGION_BASED_ISOLATION = YES;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -567,7 +582,20 @@
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
 				SWIFT_COMPILATION_MODE = wholemodule;
-				SWIFT_VERSION = 5.0;
+				SWIFT_STRICT_CONCURRENCY = complete;
+				SWIFT_UPCOMING_FEATURE_CONCISE_MAGIC_FILE = YES;
+				SWIFT_UPCOMING_FEATURE_DEPRECATE_APPLICATION_MAIN = YES;
+				SWIFT_UPCOMING_FEATURE_DISABLE_OUTWARD_ACTOR_ISOLATION = YES;
+				SWIFT_UPCOMING_FEATURE_EXISTENTIAL_ANY = YES;
+				SWIFT_UPCOMING_FEATURE_FORWARD_TRAILING_CLOSURES = YES;
+				SWIFT_UPCOMING_FEATURE_GLOBAL_CONCURRENCY = YES;
+				SWIFT_UPCOMING_FEATURE_IMPLICIT_OPEN_EXISTENTIALS = YES;
+				SWIFT_UPCOMING_FEATURE_IMPORT_OBJC_FORWARD_DECLS = YES;
+				SWIFT_UPCOMING_FEATURE_INFER_SENDABLE_FROM_CAPTURES = YES;
+				SWIFT_UPCOMING_FEATURE_INTERNAL_IMPORTS_BY_DEFAULT = YES;
+				SWIFT_UPCOMING_FEATURE_ISOLATED_DEFAULT_VALUES = YES;
+				SWIFT_UPCOMING_FEATURE_REGION_BASED_ISOLATION = YES;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
@@ -653,6 +681,7 @@
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -707,7 +736,20 @@
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "TEST DEBUG FP_LOG";
 				SWIFT_COMPILATION_MODE = singlefile;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 5.0;
+				SWIFT_STRICT_CONCURRENCY = complete;
+				SWIFT_UPCOMING_FEATURE_CONCISE_MAGIC_FILE = YES;
+				SWIFT_UPCOMING_FEATURE_DEPRECATE_APPLICATION_MAIN = YES;
+				SWIFT_UPCOMING_FEATURE_DISABLE_OUTWARD_ACTOR_ISOLATION = YES;
+				SWIFT_UPCOMING_FEATURE_EXISTENTIAL_ANY = YES;
+				SWIFT_UPCOMING_FEATURE_FORWARD_TRAILING_CLOSURES = YES;
+				SWIFT_UPCOMING_FEATURE_GLOBAL_CONCURRENCY = YES;
+				SWIFT_UPCOMING_FEATURE_IMPLICIT_OPEN_EXISTENTIALS = YES;
+				SWIFT_UPCOMING_FEATURE_IMPORT_OBJC_FORWARD_DECLS = YES;
+				SWIFT_UPCOMING_FEATURE_INFER_SENDABLE_FROM_CAPTURES = YES;
+				SWIFT_UPCOMING_FEATURE_INTERNAL_IMPORTS_BY_DEFAULT = YES;
+				SWIFT_UPCOMING_FEATURE_ISOLATED_DEFAULT_VALUES = YES;
+				SWIFT_UPCOMING_FEATURE_REGION_BASED_ISOLATION = YES;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Test;
diff --git a/README.md b/README.md
index f92c3594e..029d6f1b5 100644
--- a/README.md
+++ b/README.md
@@ -70,7 +70,7 @@ Examples can be found here:
 
 ## Requirements
 
-FloatingPanel is written in Swift 5.0+ and compatible with iOS 12.0+.
+FloatingPanel is compatible with Swift 5.10+ and iOS 13.0+.
 
 ## Documentation
 
diff --git a/Sources/BackdropView.swift b/Sources/BackdropView.swift
index b1e48c793..71a7a23b3 100644
--- a/Sources/BackdropView.swift
+++ b/Sources/BackdropView.swift
@@ -12,10 +12,10 @@ open class BackdropView: UIView {
     /// To dismiss a panel by tap gestures on the backdrop, `dismissalTapGestureRecognizer.isEnabled` is set to true.
     @objc public var dismissalTapGestureRecognizer: UITapGestureRecognizer
 
-    public init() {
+    public override init(frame: CGRect = .zero) {
         dismissalTapGestureRecognizer = UITapGestureRecognizer()
         dismissalTapGestureRecognizer.isEnabled = false
-        super.init(frame: .zero)
+        super.init(frame: frame)
         addGestureRecognizer(dismissalTapGestureRecognizer)
     }
 
diff --git a/Sources/Behavior.swift b/Sources/Behavior.swift
index 339f63957..afb129a51 100644
--- a/Sources/Behavior.swift
+++ b/Sources/Behavior.swift
@@ -4,7 +4,7 @@ import UIKit
 
 /// An interface for generating behavior information to fine-tune the behavior of a panel.
 @objc
-public protocol FloatingPanelBehavior {
+public protocol FloatingPanelBehavior: Sendable {
     /// A floating-point value that determines the rate of oscillation magnitude reduction after the user lifts their finger.
     ///
     /// The oscillation magnitude to attract a panel to an anchor can be adjusted this value between 0.979 and 1.0
@@ -58,7 +58,7 @@ public protocol FloatingPanelBehavior {
 /// The default behavior object for a panel
 ///
 /// This behavior object is fine-tuned to behave as a search panel(card) in Apple Maps on iPhone portrait orientation.
-open class FloatingPanelDefaultBehavior: FloatingPanelBehavior {
+open class FloatingPanelDefaultBehavior: FloatingPanelBehavior, @unchecked Sendable {
     public init() {}
 
     open var springDecelerationRate: CGFloat {
@@ -86,9 +86,9 @@ open class FloatingPanelDefaultBehavior: FloatingPanelBehavior {
 
 class BehaviorAdapter {
     unowned let vc: FloatingPanelController
-    fileprivate var behavior: FloatingPanelBehavior
+    fileprivate var behavior: any FloatingPanelBehavior
 
-    init(vc: FloatingPanelController, behavior: FloatingPanelBehavior) {
+    init(vc: FloatingPanelController, behavior: any FloatingPanelBehavior) {
         self.vc = vc
         self.behavior = behavior
     }
@@ -123,7 +123,7 @@ class BehaviorAdapter {
 }
 
 extension FloatingPanelController {
-    var _behavior: FloatingPanelBehavior {
+    var _behavior: any FloatingPanelBehavior {
         get { floatingPanel.behaviorAdapter.behavior }
         set { floatingPanel.behaviorAdapter.behavior = newValue}
     }
diff --git a/Sources/Controller.swift b/Sources/Controller.swift
index 099c50a41..68ff92f27 100644
--- a/Sources/Controller.swift
+++ b/Sources/Controller.swift
@@ -6,14 +6,15 @@ import os.log
 /// A set of methods implemented by the delegate of a panel controller allows the adopting delegate to respond to
 /// messages from the FloatingPanelController class and thus respond to, and in some affect, operations such as
 /// dragging, attracting a panel, layout of a panel and the content, and transition animations.
+@MainActor
 @objc public protocol FloatingPanelControllerDelegate {
     /// Returns a FloatingPanelLayout object. If you use the default one, you can use a `FloatingPanelBottomLayout` object.
     @objc(floatingPanel:layoutForTraitCollection:) optional
-    func floatingPanel(_ fpc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout
+    func floatingPanel(_ fpc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> any FloatingPanelLayout
 
     /// Returns a FloatingPanelLayout object. If you use the default one, you can use a `FloatingPanelBottomLayout` object.
     @objc(floatingPanel:layoutForSize:) optional
-    func floatingPanel(_ fpc: FloatingPanelController, layoutFor size: CGSize) -> FloatingPanelLayout
+    func floatingPanel(_ fpc: FloatingPanelController, layoutFor size: CGSize) -> any FloatingPanelLayout
 
     /// Returns a UIViewPropertyAnimator object to add/present the panel to a state anchor.
     ///
@@ -146,14 +147,14 @@ import os.log
 open class FloatingPanelController: UIViewController {
     /// Constants indicating how safe area insets are added to the adjusted content inset.
     @objc
-    public enum ContentInsetAdjustmentBehavior: Int {
+    public enum ContentInsetAdjustmentBehavior: Int, Sendable {
         case always
         case never
     }
 
     /// A flag used to determine how the controller object lays out the content view when the surface position changes.
     @objc
-    public enum ContentMode: Int {
+    public enum ContentMode: Int, Sendable {
         /// The option to fix the content to keep the height of the top most position.
         case `static`
         /// The option to scale the content to fit the bounds of the root view by changing the surface position.
@@ -162,7 +163,7 @@ open class FloatingPanelController: UIViewController {
 
     /// The delegate of a panel controller object.
     @objc
-    public weak var delegate: FloatingPanelControllerDelegate?{
+    public weak var delegate: (any FloatingPanelControllerDelegate)?{
         didSet{
             didUpdateDelegate()
         }
@@ -210,7 +211,7 @@ open class FloatingPanelController: UIViewController {
     /// You need to call ``invalidateLayout()`` if you want to apply a new layout object into the panel
     /// immediately.
     @objc
-    public var layout: FloatingPanelLayout {
+    public var layout: any FloatingPanelLayout {
         get { _layout }
         set {
             _layout = newValue
@@ -223,7 +224,7 @@ open class FloatingPanelController: UIViewController {
 
     /// The behavior object that the controller manages
     @objc
-    public var behavior: FloatingPanelBehavior {
+    public var behavior: any FloatingPanelBehavior {
         get { _behavior }
         set {
             _behavior = newValue
@@ -294,7 +295,7 @@ open class FloatingPanelController: UIViewController {
 
     /// Initialize a newly created panel controller.
     @objc
-    public init(delegate: FloatingPanelControllerDelegate? = nil) {
+    public init(delegate: (any FloatingPanelControllerDelegate)? = nil) {
         super.init(nibName: nil, bundle: nil)
         self.delegate = delegate
         setUp()
@@ -306,7 +307,7 @@ open class FloatingPanelController: UIViewController {
         modalPresentationStyle = .custom
         transitioningDelegate = modalTransition
 
-        let initialLayout: FloatingPanelLayout
+        let initialLayout: any FloatingPanelLayout
         if let layout = delegate?.floatingPanel?(self, layoutFor: traitCollection) {
             initialLayout = layout
         } else {
@@ -356,7 +357,7 @@ open class FloatingPanelController: UIViewController {
         floatingPanel.adjustScrollContentInsetIfNeeded()
     }
 
-    open override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
+    open override func viewWillTransition(to size: CGSize, with coordinator: any UIViewControllerTransitionCoordinator) {
         super.viewWillTransition(to: size, with: coordinator)
 
         if self.view.bounds.size == size {
@@ -375,7 +376,7 @@ open class FloatingPanelController: UIViewController {
         }
     }
 
-    open override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
+    open override func willTransition(to newCollection: UITraitCollection, with coordinator: any UIViewControllerTransitionCoordinator) {
         super.willTransition(to: newCollection, with: coordinator)
 
         if shouldUpdateLayout(from: traitCollection, to: newCollection) == false {
@@ -495,16 +496,18 @@ open class FloatingPanelController: UIViewController {
         // 2. The safe area top inset can be variable on the large title navigation bar(iOS11+).
         // That's why it needs the observation to keep `adjustedContentInsets` correct.
         safeAreaInsetsObservation = self.view.observe(\.safeAreaInsets, options: [.initial, .new, .old]) { [weak self] (_, change) in
-            // Use `self.view.safeAreaInsets` because `change.newValue` can be nil in particular case when
-            // is reported in https://github.com/SCENEE/FloatingPanel/issues/330
-            guard let self = self, change.oldValue != self.view.safeAreaInsets else { return }
+            MainActor.assumeIsolated {
+                // Use `self.view.safeAreaInsets` because `change.newValue` can be nil in particular case when
+                // is reported in https://github.com/SCENEE/FloatingPanel/issues/330
+                guard let self = self, change.oldValue != self.view.safeAreaInsets else { return }
 
-            // Sometimes the bounding rectangle of the controlled view becomes invalid when the screen is rotated.
-            // This results in its safeAreaInsets change. In that case, `self.update(safeAreaInsets:)` leads
-            // an unsatisfied constraints error. So this method should not be called with those bounds.
-            guard self.view.bounds.height > 0 && self.view.bounds.width > 0 else { return }
+                // Sometimes the bounding rectangle of the controlled view becomes invalid when the screen is rotated.
+                // This results in its safeAreaInsets change. In that case, `self.update(safeAreaInsets:)` leads
+                // an unsatisfied constraints error. So this method should not be called with those bounds.
+                guard self.view.bounds.height > 0 && self.view.bounds.width > 0 else { return }
 
-            self.update(safeAreaInsets: self.view.safeAreaInsets)
+                self.update(safeAreaInsets: self.view.safeAreaInsets)
+            }
         }
 
         move(to: floatingPanel.layoutAdapter.initialState,
@@ -770,7 +773,7 @@ extension FloatingPanelController {
 
 // MARK: - Swizzling
 
-private var originalDismissImp: IMP?
+@MainActor private var originalDismissImp: IMP?
 private typealias DismissFunction = @convention(c) (AnyObject, Selector, Bool, (() -> Void)?) -> Void
 extension FloatingPanelController {
     private static let dismissSwizzling: Void = {
diff --git a/Sources/Core.swift b/Sources/Core.swift
index 2d19ac791..cef5e6c2e 100644
--- a/Sources/Core.swift
+++ b/Sources/Core.swift
@@ -4,7 +4,6 @@ import Combine
 import UIKit
 import os.log
 
-///
 /// The presentation model of FloatingPanel
 ///
 class Core: NSObject, UIGestureRecognizerDelegate {
@@ -81,7 +80,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
 
     // MARK: - Interface
 
-    init(_ vc: FloatingPanelController, layout: FloatingPanelLayout, behavior: FloatingPanelBehavior) {
+    init(_ vc: FloatingPanelController, layout: any FloatingPanelLayout, behavior: any FloatingPanelBehavior) {
         ownerVC = vc
 
         surfaceView = SurfaceView()
@@ -116,8 +115,7 @@ class Core: NSObject, UIGestureRecognizerDelegate {
     }
 
     deinit {
-        // Release `NumericSpringAnimator.displayLink` from the run loop.
-        self.moveAnimator?.stopAnimation(false)
+        moveAnimator?.stopAnimation(false)
     }
 
     func move(
@@ -1269,7 +1267,7 @@ public class FloatingPanelPanGestureRecognizer: UIPanGestureRecognizer {
         self.floatingPanel = floatingPanel
     }
 
-    init() {
+    override init(target: Any? = nil, action: Selector? = nil) {
         super.init(target: nil, action: nil)
         name = "FloatingPanelPanGestureRecognizer"
     }
@@ -1286,7 +1284,7 @@ public class FloatingPanelPanGestureRecognizer: UIPanGestureRecognizer {
     ///
     /// - Note: The delegate is used by FloatingPanel itself. If you set your own delegate object, an
     /// exception is raised. If you want to handle the methods of UIGestureRecognizerDelegate, you can use `delegateProxy`.
-    public override weak var delegate: UIGestureRecognizerDelegate? {
+    public override weak var delegate: (any UIGestureRecognizerDelegate)? {
         get {
             return super.delegate
         }
@@ -1307,17 +1305,21 @@ public class FloatingPanelPanGestureRecognizer: UIPanGestureRecognizer {
     /// The default object implementing a set methods of the delegate of the gesture recognizer.
     ///
     /// Use this property with ``delegateProxy`` when you need to use the default gesture behaviors in a proxy implementation.
-    public var delegateOrigin: UIGestureRecognizerDelegate {
-        return floatingPanel
+    nonisolated // Enable to be called in DelegateRouter.responds(to:) and DelegateRouter.forwardingTarget(for :) in Xcode 16 Beta 6
+    public var delegateOrigin: any UIGestureRecognizerDelegate {
+        MainActor.assumeIsolated { floatingPanel }
     }
 
     /// A proxy object to intercept the default behavior of the gesture recognizer.
     ///
     /// `UIGestureRecognizerDelegate` methods implementing by this object are called instead of the default delegate,
     ///  ``delegateOrigin``.
-    public weak var delegateProxy: UIGestureRecognizerDelegate? {
+    nonisolated(unsafe)  // Enable to be called in DelegateRouter.responds(to:) and DelegateRouter.forwardingTarget(for :) in Xcode 16 Beta 6
+    public weak var delegateProxy: (any UIGestureRecognizerDelegate)? {
         didSet {
-            self.delegate = floatingPanel?.panGestureDelegateRouter // Update the cached IMP
+            MainActor.assumeIsolated {
+                self.delegate = floatingPanel?.panGestureDelegateRouter // Update the cached IMP
+            }
         }
     }
 
@@ -1348,7 +1350,7 @@ public class FloatingPanelPanGestureRecognizer: UIPanGestureRecognizer {
 
 // MARK: - Animator
 
-private class NumericSpringAnimator: NSObject {
+private final class NumericSpringAnimator: NSObject,  @unchecked Sendable  {
     struct Data {
         let value: CGFloat
         let velocity: CGFloat
diff --git a/Sources/Extensions.swift b/Sources/Extensions.swift
index 8d635855d..1a5e2c464 100644
--- a/Sources/Extensions.swift
+++ b/Sources/Extensions.swift
@@ -36,6 +36,7 @@ extension CGPoint {
 
 // MARK: - UIKit
 
+@MainActor
 protocol LayoutGuideProvider {
     var topAnchor: NSLayoutYAxisAnchor { get }
     var leftAnchor: NSLayoutXAxisAnchor { get }
@@ -93,7 +94,7 @@ extension UIView {
 }
 
 #if FP_LOG
-extension UIGestureRecognizer.State: CustomDebugStringConvertible {
+extension UIGestureRecognizer.State: @retroactive CustomDebugStringConvertible {
     public var debugDescription: String {
         switch self {
         case .began: return "began"
diff --git a/Sources/GrabberView.swift b/Sources/GrabberView.swift
index 75934fd28..599641e91 100644
--- a/Sources/GrabberView.swift
+++ b/Sources/GrabberView.swift
@@ -12,8 +12,8 @@ public class GrabberView: UIView {
         super.init(coder: aDecoder)
     }
 
-    init() {
-        super.init(frame: .zero)
+    override init(frame: CGRect = .zero) {
+        super.init(frame: frame)
         backgroundColor = barColor
     }
 
diff --git a/Sources/Layout.swift b/Sources/Layout.swift
index 2118e4c67..a809aeed8 100644
--- a/Sources/Layout.swift
+++ b/Sources/Layout.swift
@@ -4,6 +4,7 @@ import UIKit
 import os.log
 
 /// An interface for generating layout information for a panel.
+@MainActor
 @objc public protocol FloatingPanelLayout {
     /// Returns the position of a panel in a `FloatingPanelController` view .
     @objc var position: FloatingPanelPosition { get }
@@ -12,7 +13,7 @@ import os.log
     @objc var initialState: FloatingPanelState { get }
 
     /// Returns the layout anchors to specify the snapping locations for each state.
-    @objc var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] { get }
+    @objc var anchors: [FloatingPanelState: any FloatingPanelLayoutAnchoring] { get }
 
     /// Returns layout constraints to determine the cross dimension of a panel.
     @objc optional func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint]
@@ -24,14 +25,15 @@ import os.log
 /// A layout object that lays out a panel in bottom sheet style.
 @objcMembers
 open class FloatingPanelBottomLayout: NSObject, FloatingPanelLayout {
-    public override init() {
+    public nonisolated override init() {
         super.init()
     }
+
     open var initialState: FloatingPanelState {
         return .half
     }
 
-    open var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring]  {
+    open var anchors: [FloatingPanelState: any FloatingPanelLayoutAnchoring]  {
         return [
             .full: FloatingPanelLayoutAnchor(absoluteInset: 18.0, edge: .top, referenceGuide: .safeArea),
             .half: FloatingPanelLayoutAnchor(fractionalInset: 0.5, edge: .bottom, referenceGuide: .safeArea),
@@ -60,11 +62,12 @@ struct LayoutSegment {
     let upper: FloatingPanelState?
 }
 
+@MainActor
 class LayoutAdapter {
     private unowned var vc: FloatingPanelController
     private let defaultLayout = FloatingPanelBottomLayout()
 
-    fileprivate var layout: FloatingPanelLayout {
+    fileprivate var layout: any FloatingPanelLayout {
         didSet {
             surfaceView.position = position
         }
@@ -287,7 +290,7 @@ class LayoutAdapter {
         return offset.rounded(by: surfaceView.fp_displayScale)
     }
 
-    private var hiddenAnchor: FloatingPanelLayoutAnchoring {
+    private var hiddenAnchor: any FloatingPanelLayoutAnchoring {
         switch position {
         case .top:
             return FloatingPanelLayoutAnchor(absoluteInset: -100, edge: .top, referenceGuide: .superview)
@@ -300,7 +303,7 @@ class LayoutAdapter {
         }
     }
 
-    init(vc: FloatingPanelController, layout: FloatingPanelLayout) {
+    init(vc: FloatingPanelController, layout: any FloatingPanelLayout) {
         self.vc = vc
         self.layout = layout
     }
@@ -404,7 +407,7 @@ class LayoutAdapter {
         }
     }
 
-    private func referenceEdge(of anchor: FloatingPanelLayoutAnchoring) -> FloatingPanelReferenceEdge {
+    private func referenceEdge(of anchor: any FloatingPanelLayoutAnchoring) -> FloatingPanelReferenceEdge {
         switch anchor {
         case is FloatingPanelIntrinsicLayoutAnchor,
             is FloatingPanelAdaptiveLayoutAnchor:
@@ -546,7 +549,7 @@ class LayoutAdapter {
         NSLayoutConstraint.deactivate(constraint: interactionConstraint)
         interactionConstraint = nil
 
-        let layoutGuideProvider: LayoutGuideProvider
+        let layoutGuideProvider: any LayoutGuideProvider
         switch anchor.referenceGuide {
         case .safeArea:
             layoutGuideProvider = vc.view.safeAreaLayoutGuide
@@ -854,7 +857,7 @@ extension LayoutAdapter {
 }
 
 extension FloatingPanelController {
-    var _layout: FloatingPanelLayout {
+    var _layout: any FloatingPanelLayout {
         get {
             floatingPanel.layoutAdapter.layout
         }
diff --git a/Sources/LayoutAnchoring.swift b/Sources/LayoutAnchoring.swift
index 83388738e..02783d149 100644
--- a/Sources/LayoutAnchoring.swift
+++ b/Sources/LayoutAnchoring.swift
@@ -3,6 +3,7 @@
 import UIKit
 
 /// An interface for implementing custom layout anchor objects.
+@MainActor
 @objc public protocol FloatingPanelLayoutAnchoring {
     var referenceGuide: FloatingPanelLayoutReferenceGuide { get }
     func layoutConstraints(_ fpc: FloatingPanelController, for position: FloatingPanelPosition) -> [NSLayoutConstraint]
@@ -65,7 +66,7 @@ public extension FloatingPanelLayoutAnchor {
         }
     }
 
-    private func layoutConstraints(_ layoutGuide: LayoutGuideProvider, for edgeAnchor: NSLayoutYAxisAnchor) -> [NSLayoutConstraint] {
+    private func layoutConstraints(_ layoutGuide: any LayoutGuideProvider, for edgeAnchor: NSLayoutYAxisAnchor) -> [NSLayoutConstraint] {
         switch referenceEdge {
         case .top:
             if isAbsolute {
@@ -84,7 +85,7 @@ public extension FloatingPanelLayoutAnchor {
         }
     }
 
-    private func layoutConstraints(_ layoutGuide: LayoutGuideProvider, for edgeAnchor: NSLayoutXAxisAnchor) -> [NSLayoutConstraint] {
+    private func layoutConstraints(_ layoutGuide: any LayoutGuideProvider, for edgeAnchor: NSLayoutXAxisAnchor) -> [NSLayoutConstraint] {
         switch referenceEdge {
         case .left:
             if isAbsolute {
diff --git a/Sources/LayoutProperties.swift b/Sources/LayoutProperties.swift
index c33b410bf..f2f95fff4 100644
--- a/Sources/LayoutProperties.swift
+++ b/Sources/LayoutProperties.swift
@@ -3,6 +3,7 @@
 import UIKit
 
 /// Constants that specify the edge of the container of a panel.
+@MainActor
 @objc public enum FloatingPanelReferenceEdge: Int {
     case top
     case left
@@ -28,13 +29,14 @@ extension FloatingPanelReferenceEdge {
 }
 
 /// A representation to specify a rectangular area to lay out a panel.
+@MainActor
 @objc public enum FloatingPanelLayoutReferenceGuide: Int {
     case superview = 0
     case safeArea = 1
 }
 
 extension FloatingPanelLayoutReferenceGuide {
-    func layoutGuide(vc: UIViewController) -> LayoutGuideProvider {
+    func layoutGuide(vc: UIViewController) -> any LayoutGuideProvider {
         switch self {
         case .safeArea:
             return vc.view.safeAreaLayoutGuide
@@ -45,6 +47,7 @@ extension FloatingPanelLayoutReferenceGuide {
 }
 
 /// A representation to specify a bounding box which limit the content size of a panel.
+@MainActor
 @objc public enum FloatingPanelLayoutContentBoundingGuide: Int {
     case none = 0
     case superview = 1
@@ -52,7 +55,7 @@ extension FloatingPanelLayoutReferenceGuide {
 }
 
 extension FloatingPanelLayoutContentBoundingGuide {
-    func layoutGuide(_ fpc: FloatingPanelController) -> LayoutGuideProvider? {
+    func layoutGuide(_ fpc: FloatingPanelController) -> (any LayoutGuideProvider)? {
         switch self {
         case .superview:
             return fpc.view
diff --git a/Sources/Position.swift b/Sources/Position.swift
index 973bc55fc..2c7c13174 100644
--- a/Sources/Position.swift
+++ b/Sources/Position.swift
@@ -3,6 +3,7 @@
 import UIKit
 
 /// Constants describing the position of a panel in a screen
+@MainActor
 @objc public enum FloatingPanelPosition: Int {
     case top
     case left
@@ -25,7 +26,7 @@ extension FloatingPanelPosition {
         }
     }
 
-    func mainDimensionAnchor(_ layoutGuide: LayoutGuideProvider) -> NSLayoutDimension {
+    func mainDimensionAnchor(_ layoutGuide: any LayoutGuideProvider) -> NSLayoutDimension {
         switch self {
         case .top, .bottom: return layoutGuide.heightAnchor
         case .left, .right: return layoutGuide.widthAnchor
diff --git a/Sources/State.swift b/Sources/State.swift
index 25d57b9d0..70591111c 100644
--- a/Sources/State.swift
+++ b/Sources/State.swift
@@ -4,7 +4,7 @@ import Foundation
 
 /// An object that represents the display state of a panel in a screen.
 @objc
-open class FloatingPanelState: NSObject, NSCopying, RawRepresentable {
+public final class FloatingPanelState: NSObject, NSCopying, RawRepresentable, Sendable {
     public typealias RawValue = String
 
     required public init?(rawValue: RawValue) {
diff --git a/Sources/SurfaceView.swift b/Sources/SurfaceView.swift
index 1c02ab904..f59c3a105 100644
--- a/Sources/SurfaceView.swift
+++ b/Sources/SurfaceView.swift
@@ -6,7 +6,7 @@ import os.log
 /// An object for customizing the appearance of a surface view
 @objc(FloatingPanelSurfaceAppearance)
 @objcMembers
-public class SurfaceAppearance: NSObject {
+public class SurfaceAppearance: NSObject, @unchecked Sendable {
 
     /// An object that represents information to render a shadow
     @objc(FloatingPanelSurfaceAppearanceShadow)
diff --git a/Sources/SwiftUI/FloatingPanelCoordinator.swift b/Sources/SwiftUI/FloatingPanelCoordinator.swift
index 408b4def5..54069a1cf 100644
--- a/Sources/SwiftUI/FloatingPanelCoordinator.swift
+++ b/Sources/SwiftUI/FloatingPanelCoordinator.swift
@@ -1,7 +1,11 @@
 // Copyright 2025 the FloatingPanel authors. All rights reserved. MIT license.
 
 #if canImport(SwiftUI)
+#if compiler(>=6.0)
+public import SwiftUI
+#else
 import SwiftUI
+#endif
 
 /// A protocol that defines the coordination between SwiftUI and UIKit for FloatingPanel integration.
 ///
@@ -24,6 +28,7 @@ import SwiftUI
 /// 3. Handle the setup of the floating panel with the provided hosting controllers
 /// 4. Optionally provide custom implementation for `onUpdate` method
 @available(iOS 14, *)
+@MainActor
 public protocol FloatingPanelCoordinator {
     /// The type of events this coordinator can dispatch to its host view.
     ///
@@ -89,6 +94,7 @@ extension FloatingPanelCoordinator {
 /// and an empty event enumeration. Use this coordinator for basic floating panel integration
 /// when you don't need custom event handling or special configuration.
 @available(iOS 14, *)
+@MainActor
 public final class FloatingPanelDefaultCoordinator: FloatingPanelCoordinator {
     public enum Event {}
 
diff --git a/Sources/SwiftUI/FloatingPanelProxy.swift b/Sources/SwiftUI/FloatingPanelProxy.swift
index f786c9909..21e8ce7a8 100644
--- a/Sources/SwiftUI/FloatingPanelProxy.swift
+++ b/Sources/SwiftUI/FloatingPanelProxy.swift
@@ -29,6 +29,7 @@ import SwiftUI
 ///     }
 /// ```
 @available(iOS 14, *)
+@MainActor
 public struct FloatingPanelProxy {
     /// The associated floating panel controller.
     ///
diff --git a/Sources/SwiftUI/FloatingPanelView.swift b/Sources/SwiftUI/FloatingPanelView.swift
index 972a150c8..c11fc6786 100644
--- a/Sources/SwiftUI/FloatingPanelView.swift
+++ b/Sources/SwiftUI/FloatingPanelView.swift
@@ -62,11 +62,11 @@ struct FloatingPanelView<MainView: View, ContentView: View>: UIViewControllerRep
 
     /// The layout object that defines the position and size of the floating panel.
     @Environment(\.layout)
-    private var layout: FloatingPanelLayout
+    private var layout: any FloatingPanelLayout
 
     /// The behavior object that defines the interaction dynamics of the floating panel.
     @Environment(\.behavior)
-    private var behavior: FloatingPanelBehavior
+    private var behavior: any FloatingPanelBehavior
 
     /// The behavior for determining the adjusted content insets in the panel.
     @Environment(\.contentInsetAdjustmentBehavior)
@@ -154,15 +154,24 @@ extension FloatingPanelView {
 /// with a lifecycle that spans across FloatingPanelView as a FloatingPanelCoordinator. This object was created to
 /// control `FloatingPanelView/state` binding property.
 @available(iOS 14, *)
+@MainActor
 class FloatingPanelCoordinatorProxy {
     private let origin: any FloatingPanelCoordinator
     private var stateBinding: Binding<FloatingPanelState?>
 
-    private var subscriptions: Set<AnyCancellable> = Set()
-
     var proxy: FloatingPanelProxy { origin.proxy }
     var controller: FloatingPanelController { origin.controller }
 
+    class NonSendableBox {
+        var subscriptions: Set<AnyCancellable> = Set()
+        deinit {
+            for subscription in subscriptions {
+                subscription.cancel()
+            }
+        }
+    }
+    private var box = NonSendableBox()
+
     init(
         coordinator: any FloatingPanelCoordinator,
         state: Binding<FloatingPanelState?>
@@ -171,12 +180,6 @@ class FloatingPanelCoordinatorProxy {
         self.stateBinding = state
     }
 
-    deinit {
-        for subscription in subscriptions {
-            subscription.cancel()
-        }
-    }
-
     func setupFloatingPanel<Main: View, Content: View>(
         mainHostingController: UIHostingController<Main>,
         contentHostingController: UIHostingController<Content>
@@ -199,6 +202,7 @@ extension FloatingPanelCoordinatorProxy {
     // MARK: - Layout and behavior updates
 
     /// Update layout and behavior objects for the specified floating panel.
+    @MainActor
     func update(
         layout: (any FloatingPanelLayout)?,
         behavior: (any FloatingPanelBehavior)?
@@ -228,12 +232,14 @@ extension FloatingPanelCoordinatorProxy {
     // MARK: - State updates
 
     // Update the state of FloatingPanelController
+    @MainActor
     func update(state: FloatingPanelState?) {
         guard let state = state else { return }
         controller.move(to: state, animated: false)
     }
 
     /// Start observing ``FloatingPanelController/state`` through the `Core` object.
+    @MainActor
     func observeStateChanges() {
         controller.floatingPanel.statePublisher
             .sink { [weak self] state in
@@ -243,7 +249,7 @@ extension FloatingPanelCoordinatorProxy {
                 Task { @MainActor in
                     self.stateBinding.wrappedValue = state
                 }
-            }.store(in: &subscriptions)
+            }.store(in: &box.subscriptions)
     }
 }
 
@@ -252,6 +258,7 @@ extension FloatingPanelCoordinatorProxy {
     // MARK: - Environment updates
 
     /// Applies animatable environment value changes.
+    @MainActor
     func apply(animatableChanges: @escaping () -> Void, transaction: Transaction) {
         /// Returns the default animator object for compatibility with iOS 17 and earlier.
         func animateUsingDefaultAnimator(changes: @escaping () -> Void) {
diff --git a/Sources/SwiftUI/SurfaceAppearance+.swift b/Sources/SwiftUI/SurfaceAppearance+.swift
index 8c2b98930..1ed7eeb84 100644
--- a/Sources/SwiftUI/SurfaceAppearance+.swift
+++ b/Sources/SwiftUI/SurfaceAppearance+.swift
@@ -1,7 +1,11 @@
 // Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
 
 #if canImport(SwiftUI)
+#if compiler(>=6.0)
+public import SwiftUI
+#else
 import SwiftUI
+#endif
 
 @available(iOS 14, *)
 extension FloatingPanel.SurfaceAppearance {
diff --git a/Sources/SwiftUI/View+floatingPanel.swift b/Sources/SwiftUI/View+floatingPanel.swift
index 24905a47b..5e5850763 100644
--- a/Sources/SwiftUI/View+floatingPanel.swift
+++ b/Sources/SwiftUI/View+floatingPanel.swift
@@ -1,7 +1,11 @@
 // Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
 
 #if canImport(SwiftUI)
+#if compiler(>=6.0)
+public import SwiftUI
+#else
 import SwiftUI
+#endif
 
 @available(iOS 14, *)
 extension View {
diff --git a/Sources/SwiftUI/View+floatingPanelBehavior.swift b/Sources/SwiftUI/View+floatingPanelBehavior.swift
index a41482ae7..f3e165230 100644
--- a/Sources/SwiftUI/View+floatingPanelBehavior.swift
+++ b/Sources/SwiftUI/View+floatingPanelBehavior.swift
@@ -1,15 +1,19 @@
 // Copyright 2025 the FloatingPanel authors. All rights reserved. MIT license.
 
 #if canImport(SwiftUI)
+#if compiler(>=6.0)
+public import SwiftUI
+#else
 import SwiftUI
+#endif
 
 @available(iOS 14, *)
 extension EnvironmentValues {
     struct BehaviorKey: EnvironmentKey {
-        static var defaultValue: FloatingPanelBehavior = FloatingPanelDefaultBehavior()
+        static let defaultValue: any FloatingPanelBehavior = FloatingPanelDefaultBehavior()
     }
 
-    var behavior: FloatingPanelBehavior {
+    var behavior: any FloatingPanelBehavior {
         get { self[BehaviorKey.self] }
         set { self[BehaviorKey.self] = newValue }
     }
@@ -54,7 +58,7 @@ extension View {
     /// - Parameter behavior: An object conforming to the `FloatingPanelBehavior` protocol
     ///   that controls the panel's interactive dynamics, or `nil` to use the default behavior.
     public func floatingPanelBehavior(
-        _ behavior: FloatingPanelBehavior?
+        _ behavior: (any FloatingPanelBehavior)?
     ) -> some View {
         environment(\.behavior, behavior ?? FloatingPanelDefaultBehavior())
     }
diff --git a/Sources/SwiftUI/View+floatingPanelConfiguration.swift b/Sources/SwiftUI/View+floatingPanelConfiguration.swift
index 16cc133eb..3abe00e45 100644
--- a/Sources/SwiftUI/View+floatingPanelConfiguration.swift
+++ b/Sources/SwiftUI/View+floatingPanelConfiguration.swift
@@ -1,12 +1,16 @@
 // Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
 
 #if canImport(SwiftUI)
+#if compiler(>=6.0)
+public import SwiftUI
+#else
 import SwiftUI
+#endif
 
 @available(iOS 14, *)
 extension EnvironmentValues {
     struct ContentInsetAdjustmentBehaviorKey: EnvironmentKey {
-        static var defaultValue: FloatingPanelController.ContentInsetAdjustmentBehavior = .always
+        static let defaultValue: FloatingPanelController.ContentInsetAdjustmentBehavior = .always
     }
 
     var contentInsetAdjustmentBehavior: FloatingPanelController.ContentInsetAdjustmentBehavior {
@@ -15,7 +19,7 @@ extension EnvironmentValues {
     }
 
     struct ContentModeKey: EnvironmentKey {
-        static var defaultValue: FloatingPanelController.ContentMode = .static
+        static let defaultValue: FloatingPanelController.ContentMode = .static
     }
 
     var contentMode: FloatingPanelController.ContentMode {
diff --git a/Sources/SwiftUI/View+floatingPanelLayout.swift b/Sources/SwiftUI/View+floatingPanelLayout.swift
index 50399c272..086465134 100644
--- a/Sources/SwiftUI/View+floatingPanelLayout.swift
+++ b/Sources/SwiftUI/View+floatingPanelLayout.swift
@@ -1,15 +1,19 @@
 // Copyright 2025 the FloatingPanel authors. All rights reserved. MIT license.
 
 #if canImport(SwiftUI)
+#if compiler(>=6.0)
+public import SwiftUI
+#else
 import SwiftUI
+#endif
 
 @available(iOS 14, *)
 extension EnvironmentValues {
-    struct LayoutKey: EnvironmentKey {
-        static var defaultValue: FloatingPanelLayout = FloatingPanelBottomLayout()
+    private struct LayoutKey: EnvironmentKey {
+        static var defaultValue: any FloatingPanelLayout { FloatingPanelBottomLayout() }
     }
 
-    var layout: FloatingPanelLayout {
+    var layout: any FloatingPanelLayout {
         get { self[LayoutKey.self] }
         set { self[LayoutKey.self] = newValue }
     }
@@ -63,7 +67,7 @@ extension View {
     /// - Parameter layout: An object conforming to the `FloatingPanelLayout` protocol
     ///   that defines the panel's position and dimensions, or `nil` to use the default layout.
     public func floatingPanelLayout(
-        _ layout: FloatingPanelLayout?
+        _ layout: (any FloatingPanelLayout)?
     ) -> some View {
         environment(\.layout, layout ?? FloatingPanelBottomLayout())
     }
diff --git a/Sources/SwiftUI/View+floatingPanelScrollTracking.swift b/Sources/SwiftUI/View+floatingPanelScrollTracking.swift
index 5be422e52..1957332bc 100644
--- a/Sources/SwiftUI/View+floatingPanelScrollTracking.swift
+++ b/Sources/SwiftUI/View+floatingPanelScrollTracking.swift
@@ -1,7 +1,11 @@
 // Copyright 2025 the FloatingPanel authors. All rights reserved. MIT license.
 
 #if canImport(SwiftUI)
+#if compiler(>=6.0)
+public import SwiftUI
+#else
 import SwiftUI
+#endif
 
 @available(iOS 14, *)
 extension View {
diff --git a/Sources/SwiftUI/View+floatingPanelState.swift b/Sources/SwiftUI/View+floatingPanelState.swift
index a43cbee53..415d6dbb6 100644
--- a/Sources/SwiftUI/View+floatingPanelState.swift
+++ b/Sources/SwiftUI/View+floatingPanelState.swift
@@ -1,12 +1,16 @@
 // Copyright 2025 the FloatingPanel authors. All rights reserved. MIT license.
 
 #if canImport(SwiftUI)
+#if compiler(>=6.0)
+public import SwiftUI
+#else
 import SwiftUI
+#endif
 
 @available(iOS 14, *)
 extension EnvironmentValues {
     struct StateKey: EnvironmentKey {
-        static var defaultValue: Binding<FloatingPanelState?> = .constant(nil)
+        static let defaultValue: Binding<FloatingPanelState?> = .constant(nil)
     }
 
     var state: Binding<FloatingPanelState?> {
diff --git a/Sources/SwiftUI/View+floatingPanelSurface.swift b/Sources/SwiftUI/View+floatingPanelSurface.swift
index 7f9276fdb..b34acb458 100644
--- a/Sources/SwiftUI/View+floatingPanelSurface.swift
+++ b/Sources/SwiftUI/View+floatingPanelSurface.swift
@@ -1,12 +1,16 @@
 // Copyright 2021 the FloatingPanel authors. All rights reserved. MIT license.
 
 #if canImport(SwiftUI)
+#if compiler(>=6.0)
+public import SwiftUI
+#else
 import SwiftUI
+#endif
 
 @available(iOS 14, *)
 extension EnvironmentValues {
     struct SurfaceAppearanceKey: EnvironmentKey {
-        static var defaultValue = SurfaceAppearance()
+        static let defaultValue = SurfaceAppearance()
     }
 
     var surfaceAppearance: SurfaceAppearance {
@@ -15,7 +19,7 @@ extension EnvironmentValues {
     }
 
     struct GrabberHandlePaddingKey: EnvironmentKey {
-        static var defaultValue: CGFloat = 6.0
+        static let defaultValue: CGFloat = 6.0
     }
 
     var grabberHandlePadding: CGFloat {
diff --git a/Sources/Transitioning.swift b/Sources/Transitioning.swift
index ff771f8b5..006e259de 100644
--- a/Sources/Transitioning.swift
+++ b/Sources/Transitioning.swift
@@ -5,11 +5,11 @@ import UIKit
 class ModalTransition: NSObject, UIViewControllerTransitioningDelegate {
     func animationController(forPresented presented: UIViewController,
                              presenting: UIViewController,
-                             source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
+                             source: UIViewController) -> (any UIViewControllerAnimatedTransitioning)? {
         return ModalPresentTransition()
     }
 
-    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
+    func animationController(forDismissed dismissed: UIViewController) -> (any UIViewControllerAnimatedTransitioning)? {
         return ModalDismissTransition()
     }
 
@@ -81,7 +81,7 @@ class PresentationController: UIPresentationController {
 }
 
 class ModalPresentTransition: NSObject, UIViewControllerAnimatedTransitioning {
-    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
+    func transitionDuration(using transitionContext: (any UIViewControllerContextTransitioning)?) -> TimeInterval {
         guard
             let fpc = transitionContext?.viewController(forKey: .to) as? FloatingPanelController
         else { return 0.0 }
@@ -90,7 +90,7 @@ class ModalPresentTransition: NSObject, UIViewControllerAnimatedTransitioning {
         return TimeInterval(animator.duration)
     }
 
-    func interruptibleAnimator(using transitionContext: UIViewControllerContextTransitioning) -> UIViewImplicitlyAnimating {
+    func interruptibleAnimator(using transitionContext: any UIViewControllerContextTransitioning) -> any UIViewImplicitlyAnimating {
         guard
             let fpc = transitionContext.viewController(forKey: .to) as? FloatingPanelController
         else { fatalError() }
@@ -110,13 +110,13 @@ class ModalPresentTransition: NSObject, UIViewControllerAnimatedTransitioning {
         return transitionAnimator
     }
 
-    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
+    func animateTransition(using transitionContext: any UIViewControllerContextTransitioning) {
         self.interruptibleAnimator(using: transitionContext).startAnimation()
     }
 }
 
 class ModalDismissTransition: NSObject, UIViewControllerAnimatedTransitioning {
-    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
+    func transitionDuration(using transitionContext: (any UIViewControllerContextTransitioning)?) -> TimeInterval {
         guard
             let fpc = transitionContext?.viewController(forKey: .from) as? FloatingPanelController
         else { return 0.0 }
@@ -125,7 +125,7 @@ class ModalDismissTransition: NSObject, UIViewControllerAnimatedTransitioning {
         return TimeInterval(animator.duration)
     }
 
-    func interruptibleAnimator(using transitionContext: UIViewControllerContextTransitioning) -> UIViewImplicitlyAnimating {
+    func interruptibleAnimator(using transitionContext: any UIViewControllerContextTransitioning) -> any UIViewImplicitlyAnimating {
         guard
             let fpc = transitionContext.viewController(forKey: .from) as? FloatingPanelController
         else { fatalError() }
@@ -142,7 +142,7 @@ class ModalDismissTransition: NSObject, UIViewControllerAnimatedTransitioning {
         return fpc.transitionAnimator!
     }
 
-    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
+    func animateTransition(using transitionContext: any UIViewControllerContextTransitioning) {
         self.interruptibleAnimator(using: transitionContext).startAnimation()
     }
 }
diff --git a/Tests/ControllerTests.swift b/Tests/ControllerTests.swift
index e0f41b162..49a5d712f 100644
--- a/Tests/ControllerTests.swift
+++ b/Tests/ControllerTests.swift
@@ -4,6 +4,7 @@ import OSLog
 import XCTest
 @testable import FloatingPanel
 
+@MainActor
 class ControllerTests: XCTestCase {
     override func setUp() {}
     override func tearDown() {}
diff --git a/Tests/CoreTests.swift b/Tests/CoreTests.swift
index 9dfda5e30..32754d99d 100644
--- a/Tests/CoreTests.swift
+++ b/Tests/CoreTests.swift
@@ -3,6 +3,7 @@
 import XCTest
 @testable import FloatingPanel
 
+@MainActor
 class CoreTests: XCTestCase {
     override func setUp() {}
     override func tearDown() {}
diff --git a/Tests/LayoutTests.swift b/Tests/LayoutTests.swift
index b99a9ca5b..315ed90f5 100644
--- a/Tests/LayoutTests.swift
+++ b/Tests/LayoutTests.swift
@@ -3,6 +3,7 @@
 import XCTest
 @testable import FloatingPanel
 
+@MainActor
 class LayoutTests: XCTestCase {
     var fpc: FloatingPanelController!
     override func setUp() {
@@ -662,6 +663,8 @@ class LayoutTests: XCTestCase {
 }
 
 private typealias LayoutSegmentTestParameter = (UInt, pos: CGFloat, forwardY: Bool, lower: FloatingPanelState?, upper: FloatingPanelState?)
+
+@MainActor
 private func assertLayoutSegment(_ floatingPanel: Core, with params: [LayoutSegmentTestParameter]) {
     params.forEach { (line, pos, forwardY, lowr, upper) in
         let segment = floatingPanel.layoutAdapter.segment(at: pos, forward: forwardY)
diff --git a/Tests/TestSupports.swift b/Tests/TestSupports.swift
index 9601cfe72..88eea7605 100644
--- a/Tests/TestSupports.swift
+++ b/Tests/TestSupports.swift
@@ -16,6 +16,8 @@ extension FloatingPanelController {
 }
 
 class FloatingPanelTestDelegate: FloatingPanelControllerDelegate {
+    @MainActor
+    init() {}
     var position: FloatingPanelState = .hidden
     var didMoveCallback: ((FloatingPanelController) -> Void)?
     func floatingPanelDidChangeState(_ vc: FloatingPanelController) {
@@ -82,7 +84,7 @@ class FloatingPanelTopPositionedLayout: FloatingPanelLayout {
     ]
 }
 
-class FloatingPanelProjectableBehavior: FloatingPanelBehavior {
+final class FloatingPanelProjectableBehavior: FloatingPanelBehavior {
     func shouldProjectMomentum(_ fpc: FloatingPanelController, to proposedState: FloatingPanelState) -> Bool {
         return true
     }