diff --git a/Sources/Defaults/Defaults+Bridge.swift b/Sources/Defaults/Defaults+Bridge.swift
index a283d5e..b1da6fc 100644
--- a/Sources/Defaults/Defaults+Bridge.swift
+++ b/Sources/Defaults/Defaults+Bridge.swift
@@ -53,7 +53,7 @@ extension Defaults {
 }
 
 extension Defaults {
-	public struct URLBridge: CodableBridge {
+	public struct URLBridge: CodableBridge, Sendable {
 		public typealias Value = URL
 	}
 }
@@ -296,7 +296,7 @@ extension Defaults {
 }
 
 extension Defaults {
-	public struct UUIDBridge: Bridge {
+	public struct UUIDBridge: Bridge, Sendable {
 		public typealias Value = UUID
 		public typealias Serializable = String
 
@@ -373,7 +373,7 @@ extension Defaults {
 
 	It is unsafe to convert `SwiftUI.Color` to `UIColor` and use `UIColor.bridge` to serialize it, because `UIColor` does not hold a color space, but `Swift.Color` does (which means color space might get lost in the conversion). The bridge will always try to preserve the color space whenever `Color#cgColor` exists. Only when `Color#cgColor` is `nil`, will it use `UIColor.bridge` to do the serialization and deserialization.
 	*/
-	public struct ColorBridge: Bridge {
+	public struct ColorBridge: Bridge, Sendable {
 		public typealias Value = Color
 		public typealias Serializable = Any
 
@@ -428,7 +428,7 @@ extension Defaults {
 }
 
 extension Defaults {
-	public struct AnyBridge: Defaults.Bridge {
+	public struct AnyBridge: Defaults.Bridge, Sendable {
 		public typealias Value = Defaults.AnySerializable
 		public typealias Serializable = Any
 
diff --git a/Sources/Defaults/Defaults.swift b/Sources/Defaults/Defaults.swift
index dfa4731..88b040d 100644
--- a/Sources/Defaults/Defaults.swift
+++ b/Sources/Defaults/Defaults.swift
@@ -89,7 +89,7 @@ extension Defaults {
 
 	- Important: The `UserDefaults` name must be ASCII, not start with `@`, and cannot contain a dot (`.`).
 	*/
-	public final class Key<Value: Serializable>: _AnyKey {
+	public final class Key<Value: Serializable>: _AnyKey, @unchecked Sendable {
 		/**
 		It will be executed in these situations: