diff --git a/JsonDecodeProtection.xcodeproj/project.pbxproj b/JsonDecodeProtection.xcodeproj/project.pbxproj
index 5275175..e3fc5bb 100644
--- a/JsonDecodeProtection.xcodeproj/project.pbxproj
+++ b/JsonDecodeProtection.xcodeproj/project.pbxproj
@@ -494,7 +494,7 @@
 				SUPPORTS_MACCATALYST = NO;
 				SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SWIFT_EMIT_LOC_STRINGS = YES;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -527,7 +527,7 @@
 				SUPPORTS_MACCATALYST = NO;
 				SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SWIFT_EMIT_LOC_STRINGS = YES;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
diff --git a/README.md b/README.md
index 8f22e4e..a22f684 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # JsonProtection
-[![Swift-5.8](https://img.shields.io/badge/Swift-5.8-red.svg?style=plastic&logo=Swift&logoColor=white&link=)](https://developer.apple.com/swift/)
+[![Swift-6.0](https://img.shields.io/badge/Swift-6.0-red.svg?style=plastic&logo=Swift&logoColor=white&link=)](https://developer.apple.com/swift/)
 [![example workflow](https://github.com/Darktt/JsonProtection/actions/workflows/main.yml/badge.svg)]()
 
 處理後端提供各種神奇 Json 資料，而做的解析保護
@@ -10,7 +10,7 @@
 
 * File > Swift Packages > Add Package Dependency
 * Add https://github.com/Darktt/JsonProtection
-* Select "Up to Next Major" with "1.1.0"
+* Select "Up to Next Major" with "1.2.0"
 
 ## 功能說明
 
diff --git a/SourceCode/JsonProtection/DTAES.swift b/SourceCode/JsonProtection/DTAES.swift
index c0a9829..c2dbd67 100644
--- a/SourceCode/JsonProtection/DTAES.swift
+++ b/SourceCode/JsonProtection/DTAES.swift
@@ -219,7 +219,7 @@ extension DTAES
     }
     
     public
-    struct Options: OptionSet
+    struct Options: OptionSet, Sendable
     {
         public typealias RawValue = UInt8