diff --git a/.github/workflows/deploy_docc.yml b/.github/workflows/deploy_docc.yml
index e425ab1..b7ea417 100644
--- a/.github/workflows/deploy_docc.yml
+++ b/.github/workflows/deploy_docc.yml
@@ -17,7 +17,7 @@ jobs:
   build:
     runs-on: macos-14
     env:
-      DEVELOPER_DIR: /Applications/Xcode_15.4.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_16.app/Contents/Developer
 
     steps:
       - name: Checkout
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9615d86..d03d600 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
     name: Unit Test
     runs-on: macos-14
     env:
-      DEVELOPER_DIR: "/Applications/Xcode_15.4.app/Contents/Developer"
+      DEVELOPER_DIR: "/Applications/Xcode_16.app/Contents/Developer"
     timeout-minutes: 30
 
     steps:
@@ -27,12 +27,5 @@ jobs:
           xcodebuild test \
             -project Examples/Examples.xcodeproj \
             -scheme Examples \
-            -destination "platform=iOS Simulator,name=iPhone 15,OS=17.5" \
+            -destination "platform=iOS Simulator,name=iPhone 15,OS=18.0" \
             -resultBundlePath TestResults/result_bundle
-
-      - name: Archive test results
-        if: success() || failure()
-        uses: kishikawakatsumi/xcresulttool@2b37f116695328d5e503ac8dadca0f1545a51da4 #v1.7.1
-        with:
-          path: TestResults/result_bundle.xcresult
-          show-passed-tests: false
diff --git a/Examples/Examples.xcodeproj/project.pbxproj b/Examples/Examples.xcodeproj/project.pbxproj
index 80af2b2..70ae0db 100644
--- a/Examples/Examples.xcodeproj/project.pbxproj
+++ b/Examples/Examples.xcodeproj/project.pbxproj
@@ -3,14 +3,13 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 56;
+	objectVersion = 77;
 	objects = {
 
 /* Begin PBXBuildFile section */
 		183D25902B56695D001FDBDB /* ExamplesApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = 183D258F2B56695D001FDBDB /* ExamplesApp.swift */; };
 		183D25922B56695D001FDBDB /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 183D25912B56695D001FDBDB /* ContentView.swift */; };
 		183D25942B566967001FDBDB /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 183D25932B566967001FDBDB /* Assets.xcassets */; };
-		183D25982B566967001FDBDB /* Preview Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 183D25972B566967001FDBDB /* Preview Assets.xcassets */; };
 		183D25A12B5669ED001FDBDB /* WebUI in Frameworks */ = {isa = PBXBuildFile; productRef = 183D25A02B5669ED001FDBDB /* WebUI */; };
 		183D25A32B566AE8001FDBDB /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 183D25A22B566AE8001FDBDB /* AppDelegate.swift */; };
 		1852BC8F2CBFB72600133987 /* sample.html in Resources */ = {isa = PBXBuildFile; fileRef = 1852BC8E2CBFB72600133987 /* sample.html */; };
@@ -34,7 +33,6 @@
 		183D25912B56695D001FDBDB /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
 		183D25932B566967001FDBDB /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		183D25952B566967001FDBDB /* Examples.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = Examples.entitlements; sourceTree = "<group>"; };
-		183D25972B566967001FDBDB /* Preview Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = "Preview Assets.xcassets"; sourceTree = "<group>"; };
 		183D259E2B56699B001FDBDB /* WebUI */ = {isa = PBXFileReference; lastKnownFileType = wrapper; name = WebUI; path = ..; sourceTree = "<group>"; };
 		183D25A22B566AE8001FDBDB /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		183D25A42B566BDB001FDBDB /* Examples.xctestplan */ = {isa = PBXFileReference; lastKnownFileType = text; path = Examples.xctestplan; sourceTree = "<group>"; };
@@ -87,26 +85,17 @@
 		183D258E2B56695D001FDBDB /* Examples */ = {
 			isa = PBXGroup;
 			children = (
+				183D25952B566967001FDBDB /* Examples.entitlements */,
+				183D25932B566967001FDBDB /* Assets.xcassets */,
+				1852BC8E2CBFB72600133987 /* sample.html */,
 				183D25A22B566AE8001FDBDB /* AppDelegate.swift */,
 				183D258F2B56695D001FDBDB /* ExamplesApp.swift */,
 				183D25912B56695D001FDBDB /* ContentView.swift */,
 				18C686112B6B3DB600D45A40 /* ContentViewState.swift */,
-				183D25932B566967001FDBDB /* Assets.xcassets */,
-				183D25952B566967001FDBDB /* Examples.entitlements */,
-				183D25962B566967001FDBDB /* Preview Content */,
-				1852BC8E2CBFB72600133987 /* sample.html */,
 			);
 			path = Examples;
 			sourceTree = "<group>";
 		};
-		183D25962B566967001FDBDB /* Preview Content */ = {
-			isa = PBXGroup;
-			children = (
-				183D25972B566967001FDBDB /* Preview Assets.xcassets */,
-			);
-			path = "Preview Content";
-			sourceTree = "<group>";
-		};
 		183D259F2B5669ED001FDBDB /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
@@ -171,7 +160,7 @@
 			attributes = {
 				BuildIndependentTargetsInParallel = 1;
 				LastSwiftUpdateCheck = 1530;
-				LastUpgradeCheck = 1520;
+				LastUpgradeCheck = 1620;
 				TargetAttributes = {
 					183D258B2B56695D001FDBDB = {
 						CreatedOnToolsVersion = 15.2;
@@ -183,7 +172,6 @@
 				};
 			};
 			buildConfigurationList = 183D25872B56695D001FDBDB /* Build configuration list for PBXProject "Examples" */;
-			compatibilityVersion = "Xcode 14.0";
 			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
@@ -191,6 +179,7 @@
 				Base,
 			);
 			mainGroup = 183D25832B56695D001FDBDB;
+			preferredProjectObjectVersion = 77;
 			productRefGroup = 183D258D2B56695D001FDBDB /* Products */;
 			projectDirPath = "";
 			projectRoot = "";
@@ -206,7 +195,6 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				183D25982B566967001FDBDB /* Preview Assets.xcassets in Resources */,
 				183D25942B566967001FDBDB /* Assets.xcassets in Resources */,
 				1852BC8F2CBFB72600133987 /* sample.html in Resources */,
 			);
@@ -286,6 +274,7 @@
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				COPY_PHASE_STRIP = NO;
+				DEAD_CODE_STRIPPING = YES;
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
@@ -349,6 +338,7 @@
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				COPY_PHASE_STRIP = NO;
+				DEAD_CODE_STRIPPING = YES;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
@@ -378,7 +368,7 @@
 				CODE_SIGN_ENTITLEMENTS = Examples/Examples.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = 1;
-				DEVELOPMENT_ASSET_PATHS = "\"Examples/Preview Content\"";
+				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = "";
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
@@ -402,7 +392,7 @@
 				SDKROOT = auto;
 				SUPPORTED_PLATFORMS = "iphoneos iphonesimulator macosx";
 				SWIFT_EMIT_LOC_STRINGS = YES;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -415,7 +405,7 @@
 				CODE_SIGN_ENTITLEMENTS = Examples/Examples.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = 1;
-				DEVELOPMENT_ASSET_PATHS = "\"Examples/Preview Content\"";
+				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = "";
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
@@ -439,7 +429,7 @@
 				SDKROOT = auto;
 				SUPPORTED_PLATFORMS = "iphoneos iphonesimulator macosx";
 				SWIFT_EMIT_LOC_STRINGS = YES;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
@@ -449,6 +439,7 @@
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = 1;
+				DEAD_CODE_STRIPPING = YES;
 				GENERATE_INFOPLIST_FILE = YES;
 				MARKETING_VERSION = 1.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.cybozu.ExamplesUITests;
@@ -456,7 +447,7 @@
 				SDKROOT = auto;
 				SUPPORTED_PLATFORMS = "iphoneos iphonesimulator macosx";
 				SWIFT_EMIT_LOC_STRINGS = NO;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				TEST_TARGET_NAME = Examples;
 			};
@@ -467,6 +458,7 @@
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = 1;
+				DEAD_CODE_STRIPPING = YES;
 				GENERATE_INFOPLIST_FILE = YES;
 				MARKETING_VERSION = 1.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.cybozu.ExamplesUITests;
@@ -474,7 +466,7 @@
 				SDKROOT = auto;
 				SUPPORTED_PLATFORMS = "iphoneos iphonesimulator macosx";
 				SWIFT_EMIT_LOC_STRINGS = NO;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				TEST_TARGET_NAME = Examples;
 			};
diff --git a/Examples/Examples.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved b/Examples/Examples.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
index 10155ea..640bf86 100644
--- a/Examples/Examples.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
+++ b/Examples/Examples.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
@@ -1,23 +1,24 @@
 {
+  "originHash" : "952720a94cf1cbde30e832cfc225cf74ed62a4d5b6693f57933a4243e6b84364",
   "pins" : [
     {
       "identity" : "swift-docc-plugin",
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/apple/swift-docc-plugin.git",
       "state" : {
-        "revision" : "26ac5758409154cc448d7ab82389c520fa8a8247",
-        "version" : "1.3.0"
+        "revision" : "85e4bb4e1cd62cec64a4b8e769dcefdf0c5b9d64",
+        "version" : "1.4.3"
       }
     },
     {
       "identity" : "swift-docc-symbolkit",
       "kind" : "remoteSourceControl",
-      "location" : "https://github.com/apple/swift-docc-symbolkit",
+      "location" : "https://github.com/swiftlang/swift-docc-symbolkit",
       "state" : {
         "revision" : "b45d1f2ed151d057b54504d653e0da5552844e34",
         "version" : "1.0.0"
       }
     }
   ],
-  "version" : 2
+  "version" : 3
 }
diff --git a/Examples/Examples.xcodeproj/xcshareddata/xcschemes/Examples.xcscheme b/Examples/Examples.xcodeproj/xcshareddata/xcschemes/Examples.xcscheme
index 509aa3a..a4932ec 100644
--- a/Examples/Examples.xcodeproj/xcshareddata/xcschemes/Examples.xcscheme
+++ b/Examples/Examples.xcodeproj/xcshareddata/xcschemes/Examples.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1520"
+   LastUpgradeVersion = "1620"
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Examples/Examples/Preview Content/Preview Assets.xcassets/Contents.json b/Examples/Examples/Preview Content/Preview Assets.xcassets/Contents.json
deleted file mode 100644
index 73c0059..0000000
--- a/Examples/Examples/Preview Content/Preview Assets.xcassets/Contents.json	
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "info" : {
-    "author" : "xcode",
-    "version" : 1
-  }
-}
diff --git a/Examples/ExamplesUITests/ExamplesUITests.swift b/Examples/ExamplesUITests/ExamplesUITests.swift
index 79ae61c..aeefc40 100644
--- a/Examples/ExamplesUITests/ExamplesUITests.swift
+++ b/Examples/ExamplesUITests/ExamplesUITests.swift
@@ -1,6 +1,7 @@
 import XCTest
 
 final class ExamplesUITests: XCTestCase {
+    @MainActor
     func testHappyPath() {
         let app = XCUIApplication()
         app.launch()
diff --git a/Examples/Package.swift b/Examples/Package.swift
index 64c94d6..8dfdabd 100644
--- a/Examples/Package.swift
+++ b/Examples/Package.swift
@@ -1,5 +1,4 @@
-// swift-tools-version: 5.10
-// The swift-tools-version declares the minimum version of Swift required to build this package.
+// swift-tools-version: 6.0
 
 import PackageDescription
 
diff --git a/Package.swift b/Package.swift
index 1837dc1..3e8043d 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,14 +1,17 @@
-// swift-tools-version: 5.10
-// The swift-tools-version declares the minimum version of Swift required to build this package.
+// swift-tools-version: 6.0
 
 import PackageDescription
 
+let swiftSettings: [SwiftSetting] = [
+    .enableUpcomingFeature("ExistentialAny"),
+]
+
 let package = Package(
     name: "WebUI",
     platforms: [
         .macOS("13.3"),
         .iOS("16.4"),
-        .visionOS("2.0")
+        .visionOS(.v2),
     ],
     products: [
         .library(
@@ -17,23 +20,17 @@ let package = Package(
         )
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-docc-plugin.git", exact: "1.3.0")
+        .package(url: "https://github.com/apple/swift-docc-plugin.git", exact: "1.4.3")
     ],
     targets: [
         .target(
             name: "WebUI",
-            swiftSettings: [
-                .enableExperimentalFeature("StrictConcurrency"),
-                .enableUpcomingFeature("ExistentialAny"),
-                .enableUpcomingFeature("GlobalConcurrency"),
-            ]
+            swiftSettings: swiftSettings
         ),
         .testTarget(
             name: "WebUITests",
             dependencies: ["WebUI"],
-            swiftSettings: [
-                .enableUpcomingFeature("ExistentialAny")
-            ]
+            swiftSettings: swiftSettings
         )
     ]
 )
diff --git a/README.md b/README.md
index 1592fb5..604e0cf 100644
--- a/README.md
+++ b/README.md
@@ -14,8 +14,8 @@ WebUI is a Swift package that provides WKWebView wrapped by SwiftUI.
 
 ## Requirements
 
-- Development with Xcode 15.4+
-- Written in Swift 5.10
+- Development with Xcode 16.0+
+- Written in Swift 6.0
 - Compatible with iOS 16.4+
 - Compatible with macOS 13.3+
 
@@ -129,7 +129,7 @@ WebUI is available through [Swift Package Manager](https://github.com/apple/swif
 
 1. Create `Package.swift` that describes dependencies.
    ```swift
-   // swift-tools-version: 5.10
+   // swift-tools-version: 6.0
    import PackageDescription
    
    let package = Package(
@@ -138,7 +138,7 @@ WebUI is available through [Swift Package Manager](https://github.com/apple/swif
            .library(name: "SomeProduct", targets: ["SomeProduct"])
        ],
        dependencies: [
-           .package(url: "https://github.com/cybozu/WebUI.git", exact: "2.0.0")
+           .package(url: "https://github.com/cybozu/WebUI.git", exact: "3.0.0")
        ],
        targets: [
            .target(
diff --git a/Sources/WebUI/SetUpWebViewProxyAction.swift b/Sources/WebUI/SetUpWebViewProxyAction.swift
index 3d76591..bd527db 100644
--- a/Sources/WebUI/SetUpWebViewProxyAction.swift
+++ b/Sources/WebUI/SetUpWebViewProxyAction.swift
@@ -2,7 +2,7 @@ import SwiftUI
 import WebKit
 
 struct SetUpWebViewProxyAction {
-    let action: @MainActor @Sendable (Remakeable<EnhancedWKWebView>) -> Void
+    var action: @MainActor @Sendable (Remakeable<EnhancedWKWebView>) -> Void
 
     @MainActor
     func callAsFunction(_ webView: Remakeable<EnhancedWKWebView>) {