diff --git a/Package.swift b/Package.swift
index c0934cd..758fa4d 100644
--- a/Package.swift
+++ b/Package.swift
@@ -4,10 +4,10 @@ import PackageDescription
 let package = Package(
 	name: "Defaults",
 	platforms: [
-		.macOS(.v10_13),
-		.iOS(.v12),
-		.tvOS(.v12),
-		.watchOS(.v5)
+		.macOS(.v10_15),
+		.iOS(.v13),
+		.tvOS(.v13),
+		.watchOS(.v6)
 	],
 	products: [
 		.library(
diff --git a/Sources/Defaults/Defaults.swift b/Sources/Defaults/Defaults.swift
index 6981ebf..58e85ba 100644
--- a/Sources/Defaults/Defaults.swift
+++ b/Sources/Defaults/Defaults.swift
@@ -75,6 +75,8 @@ extension Defaults {
 		//           Key          Type   UserDefaults name   Default value
 	}
 	```
+
+	- Warning: The key must be ASCII, not start with `@`, and cannot contain a dot (`.`).
 	*/
 	public final class Key<Value: Serializable>: _AnyKey {
 		/**
diff --git a/Sources/Defaults/Observation+Combine.swift b/Sources/Defaults/Observation+Combine.swift
index 26af62c..dcb5885 100644
--- a/Sources/Defaults/Observation+Combine.swift
+++ b/Sources/Defaults/Observation+Combine.swift
@@ -6,7 +6,6 @@ extension Defaults {
 	/**
 	Custom `Subscription` for `UserDefaults` key observation.
 	*/
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	final class DefaultsSubscription<SubscriberType: Subscriber>: Subscription where SubscriberType.Input == BaseChange {
 		private var subscriber: SubscriberType?
 		private var observation: UserDefaultsKeyObservation?
@@ -43,7 +42,6 @@ extension Defaults {
 	/**
 	Custom Publisher, which is using DefaultsSubscription.
 	*/
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	struct DefaultsPublisher: Publisher {
 		typealias Output = BaseChange
 		typealias Failure = Never
@@ -87,7 +85,6 @@ extension Defaults {
 	}
 	```
 	*/
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	public static func publisher<Value: Serializable>(
 		_ key: Key<Value>,
 		options: ObservationOptions = [.initial]
@@ -101,7 +98,6 @@ extension Defaults {
 	/**
 	Publisher for multiple `Key<T>` observation, but without specific information about changes.
 	*/
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	public static func publisher(
 		keys: _AnyKey...,
 		options: ObservationOptions = [.initial]
diff --git a/Sources/Defaults/SwiftUI.swift b/Sources/Defaults/SwiftUI.swift
index f93f2fa..662f3fc 100644
--- a/Sources/Defaults/SwiftUI.swift
+++ b/Sources/Defaults/SwiftUI.swift
@@ -1,8 +1,6 @@
-#if canImport(Combine)
 import SwiftUI
 import Combine
 
-@available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
 extension Defaults {
 	@MainActor
 	final class Observable<Value: Serializable>: ObservableObject {
@@ -67,7 +65,6 @@ Access stored values from SwiftUI.
 
 This is similar to `@AppStorage` but it accepts a ``Defaults/Key`` and many more types.
 */
-@available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
 @propertyWrapper
 public struct Default<Value: Defaults.Serializable>: DynamicProperty {
 	public typealias Publisher = AnyPublisher<Defaults.KeyChange<Value>, Never>
@@ -152,7 +149,6 @@ public struct Default<Value: Defaults.Serializable>: DynamicProperty {
 	}
 }
 
-@available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
 extension Default where Value: Equatable {
 	/**
 	Indicates whether the value is the same as the default value.
@@ -234,7 +230,6 @@ extension Defaults.Toggle {
 	}
 }
 
-@available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
 extension Defaults {
 	// TODO: Expose this publicly at some point.
 	private static func events<Value: Serializable>(
@@ -257,7 +252,6 @@ extension Defaults {
 	}
 }
 
-@available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
 @propertyWrapper
 private struct ViewStorage<Value>: DynamicProperty {
 	private final class ValueBox {
@@ -281,4 +275,3 @@ private struct ViewStorage<Value>: DynamicProperty {
 		self._valueBox = .init(wrappedValue: ValueBox(value()))
 	}
 }
-#endif
diff --git a/Tests/DefaultsTests/DefaultsAnySeriliazableTests.swift b/Tests/DefaultsTests/DefaultsAnySeriliazableTests.swift
index 7c29a39..b0f4017 100644
--- a/Tests/DefaultsTests/DefaultsAnySeriliazableTests.swift
+++ b/Tests/DefaultsTests/DefaultsAnySeriliazableTests.swift
@@ -368,7 +368,6 @@ final class DefaultsAnySerializableTests: XCTestCase {
 		}
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<Defaults.AnySerializable>("observeAnyKeyCombine", default: 123)
 		let expect = expectation(description: "Observation closure being called")
@@ -396,7 +395,6 @@ final class DefaultsAnySerializableTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<Defaults.AnySerializable?>("observeAnyOptionalKeyCombine")
 		let expect = expectation(description: "Observation closure being called")
diff --git a/Tests/DefaultsTests/DefaultsArrayTests.swift b/Tests/DefaultsTests/DefaultsArrayTests.swift
index 6761d3e..eb187c8 100644
--- a/Tests/DefaultsTests/DefaultsArrayTests.swift
+++ b/Tests/DefaultsTests/DefaultsArrayTests.swift
@@ -81,7 +81,6 @@ final class DefaultsArrayTests: XCTestCase {
 		XCTAssertEqual(Defaults[.array][0], newName)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<[String]>("observeArrayKeyCombine", default: fixtureArray)
 		let newName = "Chen"
@@ -108,7 +107,6 @@ final class DefaultsArrayTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<[String]?>("observeArrayOptionalKeyCombine")
 		let newName = ["Chen"]
diff --git a/Tests/DefaultsTests/DefaultsCodableEnumTests.swift b/Tests/DefaultsTests/DefaultsCodableEnumTests.swift
index 94ea8f5..a78da57 100644
--- a/Tests/DefaultsTests/DefaultsCodableEnumTests.swift
+++ b/Tests/DefaultsTests/DefaultsCodableEnumTests.swift
@@ -131,7 +131,6 @@ final class DefaultsCodableEnumTests: XCTestCase {
 		XCTAssertNotNil(UserDefaults.standard.integer(forKey: keyName))
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<FixtureCodableEnum>("observeCodableEnumKeyCombine", default: .tenMinutes)
 		let expect = expectation(description: "Observation closure being called")
@@ -159,7 +158,6 @@ final class DefaultsCodableEnumTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<FixtureCodableEnum?>("observeCodableEnumOptionalKeyCombine")
 		let expect = expectation(description: "Observation closure being called")
@@ -188,7 +186,6 @@ final class DefaultsCodableEnumTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveArrayKeyCombine() {
 		let key = Defaults.Key<[FixtureCodableEnum]>("observeCodableEnumArrayKeyCombine", default: [.tenMinutes])
 		let expect = expectation(description: "Observation closure being called")
@@ -216,7 +213,6 @@ final class DefaultsCodableEnumTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveDictionaryKeyCombine() {
 		let key = Defaults.Key<[String: FixtureCodableEnum]>("observeCodableEnumDictionaryKeyCombine", default: ["0": .tenMinutes])
 		let expect = expectation(description: "Observation closure being called")
diff --git a/Tests/DefaultsTests/DefaultsCodableTests.swift b/Tests/DefaultsTests/DefaultsCodableTests.swift
index 9200663..f70f5cd 100644
--- a/Tests/DefaultsTests/DefaultsCodableTests.swift
+++ b/Tests/DefaultsTests/DefaultsCodableTests.swift
@@ -162,7 +162,6 @@ final class DefaultsCodableTests: XCTestCase {
 		XCTAssertNotNil(UserDefaults.standard.data(forKey: keyName))
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<Unicorn>("observeCodableKeyCombine", default: fixtureCodable)
 		let expect = expectation(description: "Observation closure being called")
@@ -188,7 +187,6 @@ final class DefaultsCodableTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<Unicorn?>("observeCodableOptionalKeyCombine")
 		let expect = expectation(description: "Observation closure being called")
@@ -216,7 +214,6 @@ final class DefaultsCodableTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveArrayKeyCombine() {
 		let key = Defaults.Key<[Unicorn]>("observeCodableArrayKeyCombine", default: [fixtureCodable])
 		let expect = expectation(description: "Observation closure being called")
@@ -242,7 +239,6 @@ final class DefaultsCodableTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveDictionaryKeyCombine() {
 		let key = Defaults.Key<[String: Unicorn]>("observeCodableDictionaryKeyCombine", default: ["0": fixtureCodable])
 		let expect = expectation(description: "Observation closure being called")
diff --git a/Tests/DefaultsTests/DefaultsCollectionCustomElementTests.swift b/Tests/DefaultsTests/DefaultsCollectionCustomElementTests.swift
index 6188fff..39b17d6 100644
--- a/Tests/DefaultsTests/DefaultsCollectionCustomElementTests.swift
+++ b/Tests/DefaultsTests/DefaultsCollectionCustomElementTests.swift
@@ -170,7 +170,6 @@ final class DefaultsCollectionCustomElementTests: XCTestCase {
 		XCTAssertEqual(Defaults[.collectionCustomElementDictionary]["1"]?[0], fixtureCustomCollection2)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<Bag<Item>>("observeCollectionCustomElementKeyCombine", default: .init(items: [fixtureCustomCollection]))
 		let expect = expectation(description: "Observation closure being called")
@@ -196,7 +195,6 @@ final class DefaultsCollectionCustomElementTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<Bag<Item>?>("observeCollectionCustomElementOptionalKeyCombine")
 		let expect = expectation(description: "Observation closure being called")
@@ -225,7 +223,6 @@ final class DefaultsCollectionCustomElementTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveArrayKeyCombine() {
 		let key = Defaults.Key<[Bag<Item>]>("observeCollectionCustomElementArrayKeyCombine", default: [.init(items: [fixtureCustomCollection])])
 		let expect = expectation(description: "Observation closure being called")
@@ -251,7 +248,6 @@ final class DefaultsCollectionCustomElementTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveDictionaryKeyCombine() {
 		let key = Defaults.Key<[String: Bag<Item>]>("observeCollectionCustomElementDictionaryKeyCombine", default: ["0": .init(items: [fixtureCustomCollection])])
 		let expect = expectation(description: "Observation closure being called")
diff --git a/Tests/DefaultsTests/DefaultsCollectionTests.swift b/Tests/DefaultsTests/DefaultsCollectionTests.swift
index 12501bc..1977cd9 100644
--- a/Tests/DefaultsTests/DefaultsCollectionTests.swift
+++ b/Tests/DefaultsTests/DefaultsCollectionTests.swift
@@ -156,7 +156,6 @@ final class DefaultsCollectionTests: XCTestCase {
 		XCTAssertEqual(Defaults[.collectionDictionary]["1"]?[0], fixtureCollection[0])
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<Bag<String>>("observeCollectionKeyCombine", default: .init(items: fixtureCollection))
 		let item = "Grape"
@@ -183,7 +182,6 @@ final class DefaultsCollectionTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<Bag<String>?>("observeCollectionOptionalKeyCombine")
 		let item = "Grape"
@@ -213,7 +211,6 @@ final class DefaultsCollectionTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveArrayKeyCombine() {
 		let key = Defaults.Key<[Bag<String>]>("observeCollectionArrayKeyCombine", default: [.init(items: fixtureCollection)])
 		let item = "Grape"
@@ -240,7 +237,6 @@ final class DefaultsCollectionTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveDictionaryKeyCombine() {
 		let key = Defaults.Key<[String: Bag<String>]>("observeCollectionArrayKeyCombine", default: ["0": .init(items: fixtureCollection)])
 		let item = "Grape"
diff --git a/Tests/DefaultsTests/DefaultsCustomBridgeTests.swift b/Tests/DefaultsTests/DefaultsCustomBridgeTests.swift
index f35df79..6cbb26b 100644
--- a/Tests/DefaultsTests/DefaultsCustomBridgeTests.swift
+++ b/Tests/DefaultsTests/DefaultsCustomBridgeTests.swift
@@ -242,7 +242,6 @@ final class DefaultsCustomBridge: XCTestCase {
 		XCTAssertEqual(Defaults[.customBridgeDictionary]["0"], newUser)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<User>("observeCustomBridgeKeyCombine", default: fixtureCustomBridge)
 		let newUser = User(username: "sindresorhus", password: "123456789")
@@ -269,7 +268,6 @@ final class DefaultsCustomBridge: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<User?>("observeCustomBridgeOptionalKeyCombine")
 		let newUser = User(username: "sindresorhus", password: "123456789")
@@ -299,7 +297,6 @@ final class DefaultsCustomBridge: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveArrayKeyCombine() {
 		let key = Defaults.Key<[User]>("observeCustomBridgeArrayKeyCombine", default: [fixtureCustomBridge])
 		let newUser = User(username: "sindresorhus", password: "123456789")
@@ -326,7 +323,6 @@ final class DefaultsCustomBridge: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveDictionaryCombine() {
 		let key = Defaults.Key<[String: User]>("observeCustomBridgeDictionaryKeyCombine", default: ["0": fixtureCustomBridge])
 		let newUser = User(username: "sindresorhus", password: "123456789")
diff --git a/Tests/DefaultsTests/DefaultsDictionaryTests.swift b/Tests/DefaultsTests/DefaultsDictionaryTests.swift
index 367d400..5ca3242 100644
--- a/Tests/DefaultsTests/DefaultsDictionaryTests.swift
+++ b/Tests/DefaultsTests/DefaultsDictionaryTests.swift
@@ -64,7 +64,6 @@ final class DefaultsDictionaryTests: XCTestCase {
 		XCTAssertEqual(Defaults[.dictionary]["0"], newName)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<[String: String]>("observeDictionaryKeyCombine", default: fixtureDictionary)
 		let expect = expectation(description: "Observation closure being called")
@@ -91,7 +90,6 @@ final class DefaultsDictionaryTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<[String: String]?>("observeDictionaryOptionalKeyCombine")
 		let expect = expectation(description: "Observation closure being called")
diff --git a/Tests/DefaultsTests/DefaultsEnumTests.swift b/Tests/DefaultsTests/DefaultsEnumTests.swift
index 2ede6de..483839a 100644
--- a/Tests/DefaultsTests/DefaultsEnumTests.swift
+++ b/Tests/DefaultsTests/DefaultsEnumTests.swift
@@ -116,7 +116,6 @@ final class DefaultsEnumTests: XCTestCase {
 		XCTAssertEqual(Defaults[.enumDictionary]["0"], .halfHour)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<FixtureEnum>("observeEnumKeyCombine", default: .tenMinutes)
 		let expect = expectation(description: "Observation closure being called")
@@ -146,7 +145,6 @@ final class DefaultsEnumTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<FixtureEnum?>("observeEnumOptionalKeyCombine")
 		let expect = expectation(description: "Observation closure being called")
@@ -176,7 +174,6 @@ final class DefaultsEnumTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveArrayKeyCombine() {
 		let key = Defaults.Key<[FixtureEnum]>("observeEnumArrayKeyCombine", default: [.tenMinutes])
 		let expect = expectation(description: "Observation closure being called")
@@ -205,7 +202,6 @@ final class DefaultsEnumTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveDictionaryKeyCombine() {
 		let key = Defaults.Key<[String: FixtureEnum]>("observeEnumDictionaryKeyCombine", default: ["0": .tenMinutes])
 		let expect = expectation(description: "Observation closure being called")
diff --git a/Tests/DefaultsTests/DefaultsNSColorTests.swift b/Tests/DefaultsTests/DefaultsNSColorTests.swift
index 49a8c05..f39d3e5 100644
--- a/Tests/DefaultsTests/DefaultsNSColorTests.swift
+++ b/Tests/DefaultsTests/DefaultsNSColorTests.swift
@@ -126,7 +126,6 @@ final class DefaultsNSColorTests: XCTestCase {
 		XCTAssertTrue(Defaults[.colorDictionary]["0"]?.isEqual(fixtureColor1) ?? false)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<NSColor>("observeNSColorKeyCombine", default: fixtureColor)
 		let expect = expectation(description: "Observation closure being called")
@@ -152,7 +151,6 @@ final class DefaultsNSColorTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<NSColor?>("observeNSColorOptionalKeyCombine")
 		let expect = expectation(description: "Observation closure being called")
@@ -189,7 +187,6 @@ final class DefaultsNSColorTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveArrayKeyCombine() {
 		let key = Defaults.Key<[NSColor]>("observeNSColorArrayKeyCombine", default: [fixtureColor])
 		let expect = expectation(description: "Observation closure being called")
@@ -215,7 +212,6 @@ final class DefaultsNSColorTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveDictionaryKeyCombine() {
 		let key = Defaults.Key<[String: NSColor]>("observeNSColorDictionaryKeyCombine", default: ["0": fixtureColor])
 		let expect = expectation(description: "Observation closure being called")
diff --git a/Tests/DefaultsTests/DefaultsNSSecureCodingTests.swift b/Tests/DefaultsTests/DefaultsNSSecureCodingTests.swift
index bba19e1..297618a 100644
--- a/Tests/DefaultsTests/DefaultsNSSecureCodingTests.swift
+++ b/Tests/DefaultsTests/DefaultsNSSecureCodingTests.swift
@@ -158,7 +158,6 @@ final class DefaultsNSSecureCodingTests: XCTestCase {
 		XCTAssertEqual(Defaults[.persistentHistoryDictionary]["0"]?.value, newPersistentHistory.value)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<ExamplePersistentHistory>("observeNSSecureCodingKeyCombine", default: persistentHistoryValue)
 		let newPersistentHistory = ExamplePersistentHistory(value: "NewValue")
@@ -185,7 +184,6 @@ final class DefaultsNSSecureCodingTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<ExamplePersistentHistory?>("observeNSSecureCodingOptionalKeyCombine")
 		let newPersistentHistory = ExamplePersistentHistory(value: "NewValue")
@@ -215,7 +213,6 @@ final class DefaultsNSSecureCodingTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveArrayKeyCombine() {
 		let key = Defaults.Key<[ExamplePersistentHistory]>("observeNSSecureCodingArrayKeyCombine", default: [persistentHistoryValue])
 		let newPersistentHistory = ExamplePersistentHistory(value: "NewValue")
@@ -244,7 +241,6 @@ final class DefaultsNSSecureCodingTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveDictionaryKeyCombine() {
 		let key = Defaults.Key<[String: ExamplePersistentHistory]>("observeNSSecureCodingDictionaryKeyCombine", default: ["0": persistentHistoryValue])
 		let newPersistentHistory = ExamplePersistentHistory(value: "NewValue")
@@ -273,7 +269,6 @@ final class DefaultsNSSecureCodingTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveMultipleNSSecureKeysCombine() {
 		let key1 = Defaults.Key<ExamplePersistentHistory>("observeMultipleNSSecureCodingKey1", default: ExamplePersistentHistory(value: "TestValue"))
 		let key2 = Defaults.Key<ExamplePersistentHistory>("observeMultipleNSSecureCodingKey2", default: ExamplePersistentHistory(value: "TestValue"))
@@ -292,7 +287,6 @@ final class DefaultsNSSecureCodingTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveMultipleNSSecureOptionalKeysCombine() {
 		let key1 = Defaults.Key<ExamplePersistentHistory?>("observeMultipleNSSecureCodingOptionalKey1")
 		let key2 = Defaults.Key<ExamplePersistentHistory?>("observeMultipleNSSecureCodingOptionalKeyKey2")
@@ -334,73 +328,71 @@ final class DefaultsNSSecureCodingTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
-		func testRemoveDuplicatesObserveNSSecureCodingKeyCombine() {
-			let key = Defaults.Key<ExamplePersistentHistory>("observeNSSecureCodingKey", default: ExamplePersistentHistory(value: "TestValue"))
-			let expect = expectation(description: "Observation closure being called")
+	func testRemoveDuplicatesObserveNSSecureCodingKeyCombine() {
+		let key = Defaults.Key<ExamplePersistentHistory>("observeNSSecureCodingKey", default: ExamplePersistentHistory(value: "TestValue"))
+		let expect = expectation(description: "Observation closure being called")
 
-			let inputArray = ["NewTestValue", "NewTestValue", "NewTestValue", "NewTestValue2", "NewTestValue2", "NewTestValue2", "NewTestValue3", "NewTestValue3"]
-			let expectedArray = ["NewTestValue", "NewTestValue2", "NewTestValue3"]
+		let inputArray = ["NewTestValue", "NewTestValue", "NewTestValue", "NewTestValue2", "NewTestValue2", "NewTestValue2", "NewTestValue3", "NewTestValue3"]
+		let expectedArray = ["NewTestValue", "NewTestValue2", "NewTestValue3"]
 
-			let cancellable = Defaults
-				.publisher(key, options: [])
-				.removeDuplicates()
-				.map(\.newValue.value)
-				.collect(expectedArray.count)
-				.sink { result in
-					print("Result array: \(result)")
+		let cancellable = Defaults
+			.publisher(key, options: [])
+			.removeDuplicates()
+			.map(\.newValue.value)
+			.collect(expectedArray.count)
+			.sink { result in
+				print("Result array: \(result)")
 
-					if result == expectedArray {
-						expect.fulfill()
-					} else {
-						XCTFail("Expected Array is not matched")
-					}
+				if result == expectedArray {
+					expect.fulfill()
+				} else {
+					XCTFail("Expected Array is not matched")
 				}
-
-			inputArray.forEach {
-				Defaults[key] = ExamplePersistentHistory(value: $0)
 			}
 
-			Defaults.reset(key)
-			cancellable.cancel()
-
-			waitForExpectations(timeout: 10)
+		inputArray.forEach {
+			Defaults[key] = ExamplePersistentHistory(value: $0)
 		}
 
-		@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
-		func testRemoveDuplicatesObserveNSSecureCodingOptionalKeyCombine() {
-			let key = Defaults.Key<ExamplePersistentHistory?>("observeNSSecureCodingOptionalKey")
-			let expect = expectation(description: "Observation closure being called")
+		Defaults.reset(key)
+		cancellable.cancel()
 
-			let inputArray = ["NewTestValue", "NewTestValue", "NewTestValue", "NewTestValue2", "NewTestValue2", "NewTestValue2", "NewTestValue3", "NewTestValue3"]
-			let expectedArray = ["NewTestValue", "NewTestValue2", "NewTestValue3", nil]
+		waitForExpectations(timeout: 10)
+	}
 
-			let cancellable = Defaults
-				.publisher(key, options: [])
-				.removeDuplicates()
-				.map(\.newValue)
-				.map { $0?.value }
-				.collect(expectedArray.count)
-				.sink { result in
-					print("Result array: \(result)")
+	func testRemoveDuplicatesObserveNSSecureCodingOptionalKeyCombine() {
+		let key = Defaults.Key<ExamplePersistentHistory?>("observeNSSecureCodingOptionalKey")
+		let expect = expectation(description: "Observation closure being called")
 
-					if result == expectedArray {
-						expect.fulfill()
-					} else {
-						XCTFail("Expected Array is not matched")
-					}
+		let inputArray = ["NewTestValue", "NewTestValue", "NewTestValue", "NewTestValue2", "NewTestValue2", "NewTestValue2", "NewTestValue3", "NewTestValue3"]
+		let expectedArray = ["NewTestValue", "NewTestValue2", "NewTestValue3", nil]
+
+		let cancellable = Defaults
+			.publisher(key, options: [])
+			.removeDuplicates()
+			.map(\.newValue)
+			.map { $0?.value }
+			.collect(expectedArray.count)
+			.sink { result in
+				print("Result array: \(result)")
+
+				if result == expectedArray {
+					expect.fulfill()
+				} else {
+					XCTFail("Expected Array is not matched")
 				}
-
-			inputArray.forEach {
-				Defaults[key] = ExamplePersistentHistory(value: $0)
 			}
 
-			Defaults.reset(key)
-			cancellable.cancel()
-
-			waitForExpectations(timeout: 10)
+		inputArray.forEach {
+			Defaults[key] = ExamplePersistentHistory(value: $0)
 		}
 
+		Defaults.reset(key)
+		cancellable.cancel()
+
+		waitForExpectations(timeout: 10)
+	}
+
 	func testObserveKey() {
 		let key = Defaults.Key<ExamplePersistentHistory>("observeNSSecureCodingKey", default: persistentHistoryValue)
 		let newPersistentHistory = ExamplePersistentHistory(value: "NewValue")
diff --git a/Tests/DefaultsTests/DefaultsSetAlgebraCustomElementTests.swift b/Tests/DefaultsTests/DefaultsSetAlgebraCustomElementTests.swift
index fabb63c..8cfc860 100644
--- a/Tests/DefaultsTests/DefaultsSetAlgebraCustomElementTests.swift
+++ b/Tests/DefaultsTests/DefaultsSetAlgebraCustomElementTests.swift
@@ -174,7 +174,6 @@ final class DefaultsSetAlgebraCustomElementTests: XCTestCase {
 		XCTAssertEqual(Defaults[.setAlgebraCustomElementDictionary]["1"], .init([fixtureSetAlgebra2, fixtureSetAlgebra3]))
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<DefaultsSetAlgebra<Item>>("observeSetAlgebraKeyCombine", default: .init([fixtureSetAlgebra]))
 		let expect = expectation(description: "Observation closure being called")
@@ -202,7 +201,6 @@ final class DefaultsSetAlgebraCustomElementTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<DefaultsSetAlgebra<Item>?>("observeSetAlgebraOptionalKeyCombine")
 		let expect = expectation(description: "Observation closure being called")
@@ -231,7 +229,6 @@ final class DefaultsSetAlgebraCustomElementTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveArrayKeyCombine() {
 		let key = Defaults.Key<[DefaultsSetAlgebra<Item>]>("observeSetAlgebraArrayKeyCombine", default: [.init([fixtureSetAlgebra])])
 		let expect = expectation(description: "Observation closure being called")
@@ -259,7 +256,6 @@ final class DefaultsSetAlgebraCustomElementTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveDictionaryKeyCombine() {
 		let key = Defaults.Key<[String: DefaultsSetAlgebra<Item>]>("observeSetAlgebraDictionaryKeyCombine", default: ["0": .init([fixtureSetAlgebra])])
 		let expect = expectation(description: "Observation closure being called")
diff --git a/Tests/DefaultsTests/DefaultsSetAlgebraTests.swift b/Tests/DefaultsTests/DefaultsSetAlgebraTests.swift
index e721b83..526ce6d 100644
--- a/Tests/DefaultsTests/DefaultsSetAlgebraTests.swift
+++ b/Tests/DefaultsTests/DefaultsSetAlgebraTests.swift
@@ -206,7 +206,6 @@ final class DefaultsSetAlgebraTests: XCTestCase {
 		XCTAssertEqual(Defaults[.setAlgebraDictionary]["1"], .init([fixtureSetAlgebra2, fixtureSetAlgebra3]))
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<DefaultsSetAlgebra<Int>>("observeSetAlgebraKeyCombine", default: .init([fixtureSetAlgebra]))
 		let expect = expectation(description: "Observation closure being called")
@@ -234,7 +233,6 @@ final class DefaultsSetAlgebraTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<DefaultsSetAlgebra<Int>?>("observeSetAlgebraOptionalKeyCombine")
 		let expect = expectation(description: "Observation closure being called")
@@ -263,7 +261,6 @@ final class DefaultsSetAlgebraTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveArrayKeyCombine() {
 		let key = Defaults.Key<[DefaultsSetAlgebra<Int>]>("observeSetAlgebraArrayKeyCombine", default: [.init([fixtureSetAlgebra])])
 		let expect = expectation(description: "Observation closure being called")
@@ -291,7 +288,6 @@ final class DefaultsSetAlgebraTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveDictionaryKeyCombine() {
 		let key = Defaults.Key<[String: DefaultsSetAlgebra<Int>]>("observeSetAlgebraDictionaryKeyCombine", default: ["0": .init([fixtureSetAlgebra])])
 		let expect = expectation(description: "Observation closure being called")
diff --git a/Tests/DefaultsTests/DefaultsTests.swift b/Tests/DefaultsTests/DefaultsTests.swift
index 5e9af35..611ae62 100644
--- a/Tests/DefaultsTests/DefaultsTests.swift
+++ b/Tests/DefaultsTests/DefaultsTests.swift
@@ -167,7 +167,6 @@ final class DefaultsTests: XCTestCase {
 		Defaults.removeAll(suite: customSuite)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<Bool>("observeKey", default: false)
 		let expect = expectation(description: "Observation closure being called")
@@ -193,7 +192,6 @@ final class DefaultsTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<Bool?>("observeOptionalKey")
 		let expect = expectation(description: "Observation closure being called")
@@ -222,7 +220,6 @@ final class DefaultsTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testDynamicOptionalDateTypeCombine() {
 		let first = Date(timeIntervalSince1970: 0)
 		let second = Date(timeIntervalSince1970: 1)
@@ -254,7 +251,6 @@ final class DefaultsTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveMultipleKeysCombine() {
 		let key1 = Defaults.Key<String>("observeKey1", default: "x")
 		let key2 = Defaults.Key<Bool>("observeKey2", default: true)
@@ -273,7 +269,6 @@ final class DefaultsTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveMultipleOptionalKeysCombine() {
 		let key1 = Defaults.Key<String?>("observeOptionalKey1")
 		let key2 = Defaults.Key<Bool?>("observeOptionalKey2")
@@ -292,7 +287,6 @@ final class DefaultsTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testReceiveValueBeforeSubscriptionCombine() {
 		let key = Defaults.Key<String>("receiveValueBeforeSubscription", default: "hello")
 		let expect = expectation(description: "Observation closure being called")
@@ -502,7 +496,6 @@ final class DefaultsTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObservePreventPropagationCombine() {
 		let key1 = Defaults.Key<Bool?>("preventPropagation6", default: nil)
 		let expect = expectation(description: "No infinite recursion")
@@ -523,7 +516,6 @@ final class DefaultsTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObservePreventPropagationMultipleKeysCombine() {
 		let key1 = Defaults.Key<Bool?>("preventPropagation7", default: nil)
 		let key2 = Defaults.Key<Bool?>("preventPropagation8", default: nil)
@@ -545,7 +537,6 @@ final class DefaultsTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObservePreventPropagationModifiersCombine() {
 		let key1 = Defaults.Key<Bool?>("preventPropagation9", default: nil)
 		let expect = expectation(description: "No infinite recursion")
@@ -570,7 +561,6 @@ final class DefaultsTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testRemoveDuplicatesObserveKeyCombine() {
 		let key = Defaults.Key<Bool>("observeKey", default: false)
 		let expect = expectation(description: "Observation closure being called")
@@ -603,7 +593,6 @@ final class DefaultsTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testRemoveDuplicatesOptionalObserveKeyCombine() {
 		let key = Defaults.Key<Bool?>("observeOptionalKey", default: nil)
 		let expect = expectation(description: "Observation closure being called")
@@ -720,7 +709,6 @@ final class DefaultsTests: XCTestCase {
 		}
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testImmediatelyFinishingPublisherCombine() {
 		let key = Defaults.Key<Bool>("observeKey", default: false)
 		let expect = expectation(description: "Observation closure being called without crashing")
diff --git a/Tests/DefaultsTests/DefaultsUIColorTests.swift b/Tests/DefaultsTests/DefaultsUIColorTests.swift
index d21a1a8..d8ee69b 100644
--- a/Tests/DefaultsTests/DefaultsUIColorTests.swift
+++ b/Tests/DefaultsTests/DefaultsUIColorTests.swift
@@ -125,7 +125,6 @@ final class DefaultsNSColorTests: XCTestCase {
 		XCTAssertTrue(Defaults[.colorDictionary]["0"]?.isEqual(fixtureColor1) ?? false)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveKeyCombine() {
 		let key = Defaults.Key<UIColor>("observeNSColorKeyCombine", default: fixtureColor)
 		let expect = expectation(description: "Observation closure being called")
@@ -151,7 +150,6 @@ final class DefaultsNSColorTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveOptionalKeyCombine() {
 		let key = Defaults.Key<UIColor?>("observeNSColorOptionalKeyCombine")
 		let expect = expectation(description: "Observation closure being called")
@@ -188,7 +186,6 @@ final class DefaultsNSColorTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveArrayKeyCombine() {
 		let key = Defaults.Key<[UIColor]>("observeNSColorArrayKeyCombine", default: [fixtureColor])
 		let expect = expectation(description: "Observation closure being called")
@@ -214,7 +211,6 @@ final class DefaultsNSColorTests: XCTestCase {
 		waitForExpectations(timeout: 10)
 	}
 
-	@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, iOSApplicationExtension 13.0, macOSApplicationExtension 10.15, tvOSApplicationExtension 13.0, watchOSApplicationExtension 6.0, *)
 	func testObserveDictionaryKeyCombine() {
 		let key = Defaults.Key<[String: UIColor]>("observeNSColorDictionaryKeyCombine", default: ["0": fixtureColor])
 		let expect = expectation(description: "Observation closure being called")
diff --git a/readme.md b/readme.md
index d4d12b7..4c25b5b 100644
--- a/readme.md
+++ b/readme.md
@@ -33,10 +33,10 @@ For a real-world example, see the [Plash app](https://github.com/sindresorhus/Pl
 
 ## Compatibility
 
-- macOS 10.13+
-- iOS 12+
-- tvOS 12+
-- watchOS 5+
+- macOS 10.15+
+- iOS 13+
+- tvOS 13+
+- watchOS 6+
 
 ## Migration Guides
 
@@ -517,16 +517,12 @@ Type: `func`
 
 Observation API using [Publisher](https://developer.apple.com/documentation/combine/publisher) from the [Combine](https://developer.apple.com/documentation/combine) framework.
 
-Available on macOS 10.15+, iOS 13.0+, tvOS 13.0+, and watchOS 6.0+.
-
 #### `Defaults.publisher(keys: keys…, options:)`
 
 Type: `func`
 
 [Combine](https://developer.apple.com/documentation/combine) observation API for multiple key observation, but without specific information about changes.
 
-Available on macOS 10.15+, iOS 13.0+, tvOS 13.0+, and watchOS 6.0+.
-
 #### `Defaults.removeAll`
 
 ```swift