diff --git a/Package.swift b/Package.swift
new file mode 100644
index 0000000..edc8a13
--- /dev/null
+++ b/Package.swift
@@ -0,0 +1,31 @@
+// swift-tools-version:5.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+import PackageDescription
+
+let package = Package(
+    name: "RxWebKit",
+    platforms: [
+        .iOS(.v12)
+    ],
+    products: [
+        .library(name: "RxWebKit", targets: ["RxWebKit"])
+    ],
+    dependencies: [
+        .package(url: "https://github.com/ReactiveX/RxSwift", .upToNextMajor(from: "6.0.0")),
+        .package(url: "https://github.com/Quick/Quick.git", .upToNextMajor(from: "3.0.0")),
+        .package(url: "https://github.com/Quick/Nimble.git", .upToNextMajor(from: "9.0.0"))
+    ],
+    targets: [
+        .target(
+            name: "RxWebKit",
+            dependencies: ["RxSwift", "RxCocoa", "RxRelay"],
+            path: "RxWebKit"
+        ),
+        .testTarget(
+            name: "RxWebKitTests",
+            dependencies: ["RxWebKit", "RxTest", "Nimble", "Quick"],
+            path: "RxWebKitTests"
+        )
+    ],
+    swiftLanguageVersions: [.v5]
+)
diff --git a/RxWebKit.xcodeproj/project.pbxproj b/RxWebKit.xcodeproj/project.pbxproj
index 65c9651..9446b3e 100644
--- a/RxWebKit.xcodeproj/project.pbxproj
+++ b/RxWebKit.xcodeproj/project.pbxproj
@@ -343,7 +343,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 1020;
-				LastUpgradeCheck = 1020;
+				LastUpgradeCheck = 1240;
 				ORGANIZATIONNAME = MokuMokuCloud;
 				TargetAttributes = {
 					42F426961C66200D001FED46 = {
@@ -365,10 +365,9 @@
 			};
 			buildConfigurationList = 42F426921C66200D001FED46 /* Build configuration list for PBXProject "RxWebKit" */;
 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
-				English,
 				en,
 				Base,
 			);
@@ -512,6 +511,7 @@
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@@ -536,7 +536,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -568,6 +568,7 @@
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@@ -586,7 +587,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_VERSION = 5.0;
@@ -604,7 +605,7 @@
 					"$(PROJECT_DIR)/Carthage/Build/iOS",
 				);
 				INFOPLIST_FILE = "$(SRCROOT)/Example/Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = mokumoku.Example;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -623,7 +624,7 @@
 					"$(PROJECT_DIR)/Carthage/Build/iOS",
 				);
 				INFOPLIST_FILE = "$(SRCROOT)/Example/Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = mokumoku.Example;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -648,7 +649,7 @@
 				);
 				INFOPLIST_FILE = "$(SRCROOT)/RxWebKit/Info.plist";
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = mokumoku.RxWebKit;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -677,7 +678,7 @@
 				);
 				INFOPLIST_FILE = "$(SRCROOT)/RxWebKit/Info.plist";
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = mokumoku.RxWebKit;
 				PRODUCT_NAME = "$(TARGET_NAME)";
diff --git a/RxWebKit.xcodeproj/xcshareddata/xcschemes/Example.xcscheme b/RxWebKit.xcodeproj/xcshareddata/xcschemes/Example.xcscheme
index f1331ab..aff38dd 100644
--- a/RxWebKit.xcodeproj/xcshareddata/xcschemes/Example.xcscheme
+++ b/RxWebKit.xcodeproj/xcshareddata/xcschemes/Example.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1020"
+   LastUpgradeVersion = "1240"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -27,6 +27,15 @@
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "42F426961C66200D001FED46"
+            BuildableName = "Example.app"
+            BlueprintName = "Example"
+            ReferencedContainer = "container:RxWebKit.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
       <Testables>
          <TestableReference
             skipped = "NO">
@@ -39,17 +48,6 @@
             </BuildableReference>
          </TestableReference>
       </Testables>
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "42F426961C66200D001FED46"
-            BuildableName = "Example.app"
-            BlueprintName = "Example"
-            ReferencedContainer = "container:RxWebKit.xcodeproj">
-         </BuildableReference>
-      </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
@@ -71,8 +69,6 @@
             ReferencedContainer = "container:RxWebKit.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"
diff --git a/RxWebKit.xcodeproj/xcshareddata/xcschemes/RxWebKit.xcscheme b/RxWebKit.xcodeproj/xcshareddata/xcschemes/RxWebKit.xcscheme
index e9caa0b..bb89f64 100644
--- a/RxWebKit.xcodeproj/xcshareddata/xcschemes/RxWebKit.xcscheme
+++ b/RxWebKit.xcodeproj/xcshareddata/xcschemes/RxWebKit.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1020"
+   LastUpgradeVersion = "1240"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -27,8 +27,6 @@
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       shouldUseLaunchSchemeArgsEnv = "YES">
-      <Testables>
-      </Testables>
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
@@ -38,8 +36,8 @@
             ReferencedContainer = "container:RxWebKit.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
+      <Testables>
+      </Testables>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
@@ -60,8 +58,6 @@
             ReferencedContainer = "container:RxWebKit.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"