diff --git a/Package.swift b/Package.swift
index 7e958664..11a7d44e 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version: 5.9
+// swift-tools-version: 6.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
@@ -66,5 +66,6 @@ let package = Package(
             ],
             path: "platforms/swift/Tests/ShopifyAcceleratedCheckoutsTests"
         )
-    ]
+    ],
+    swiftLanguageModes: [.v6]
 )
diff --git a/ShopifyCheckoutKit.podspec b/ShopifyCheckoutKit.podspec
index 89c8babd..a35c3e32 100644
--- a/ShopifyCheckoutKit.podspec
+++ b/ShopifyCheckoutKit.podspec
@@ -14,7 +14,7 @@ Pod::Spec.new do |s|
     :git => "https://github.com/Shopify/checkout-kit.git", :tag => s.version.to_s
   }
 
-  s.swift_version = "5.0"
+  s.swift_version = "6.0"
 
   s.ios.deployment_target = "15.0"
 
diff --git a/platforms/swift/README.md b/platforms/swift/README.md
index ad0505e4..2b33cd85 100644
--- a/platforms/swift/README.md
+++ b/platforms/swift/README.md
@@ -38,7 +38,7 @@
 
 ## Requirements
 
-- Swift Package Manager with Swift tools 5.9+
+- Swift Package Manager with Swift tools 6.0+
 - iOS 15.0+ for `ShopifyCheckoutKit`
 - iOS 16.0+ for `ShopifyAcceleratedCheckouts`
 - A checkout URL from `cart.checkoutUrl` or a cart permalink
diff --git a/platforms/swift/Samples/ShopifyAcceleratedCheckoutsApp/ShopifyAcceleratedCheckoutsApp.xcodeproj/project.pbxproj b/platforms/swift/Samples/ShopifyAcceleratedCheckoutsApp/ShopifyAcceleratedCheckoutsApp.xcodeproj/project.pbxproj
index 559aefd2..1e845fac 100644
--- a/platforms/swift/Samples/ShopifyAcceleratedCheckoutsApp/ShopifyAcceleratedCheckoutsApp.xcodeproj/project.pbxproj
+++ b/platforms/swift/Samples/ShopifyAcceleratedCheckoutsApp/ShopifyAcceleratedCheckoutsApp.xcodeproj/project.pbxproj
@@ -475,7 +475,7 @@
 				SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SUPPORTS_XR_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;
@@ -514,7 +514,7 @@
 				SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SUPPORTS_XR_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;
@@ -531,7 +531,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.shopify.example.ShopifyAcceleratedCheckoutsAppTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_EMIT_LOC_STRINGS = NO;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -548,7 +548,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.shopify.example.ShopifyAcceleratedCheckoutsAppTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_EMIT_LOC_STRINGS = NO;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
@@ -564,7 +564,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.shopify.example.ShopifyAcceleratedCheckoutsAppUITests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_EMIT_LOC_STRINGS = NO;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				TEST_TARGET_NAME = ShopifyAcceleratedCheckoutsApp;
 			};
@@ -581,7 +581,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.shopify.example.ShopifyAcceleratedCheckoutsAppUITests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_EMIT_LOC_STRINGS = NO;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				TEST_TARGET_NAME = ShopifyAcceleratedCheckoutsApp;
 			};
diff --git a/platforms/swift/api/ShopifyCheckoutProtocol.json b/platforms/swift/api/ShopifyCheckoutProtocol.json
index f40a1f54..33a1642b 100644
--- a/platforms/swift/api/ShopifyCheckoutProtocol.json
+++ b/platforms/swift/api/ShopifyCheckoutProtocol.json
@@ -662,8 +662,8 @@
                   }
                 ],
                 "declKind": "Func",
-                "usr": "s:23ShopifyCheckoutProtocol0bC0O6ClientV2on_7performAeA22NotificationDescriptorVyxG_yxScMYcctAA12EventPayloadRzlF",
-                "mangledName": "$s23ShopifyCheckoutProtocol0bC0O6ClientV2on_7performAeA22NotificationDescriptorVyxG_yxScMYcctAA12EventPayloadRzlF",
+                "usr": "s:23ShopifyCheckoutProtocol0bC0O6ClientV2on_7performAeA22NotificationDescriptorVyxG_yxYbScMYcctAA12EventPayloadRzlF",
+                "mangledName": "$s23ShopifyCheckoutProtocol0bC0O6ClientV2on_7performAeA22NotificationDescriptorVyxG_yxYbScMYcctAA12EventPayloadRzlF",
                 "moduleName": "ShopifyCheckoutProtocol",
                 "genericSig": "<P where P : ShopifyCheckoutProtocol.EventPayload>",
                 "declAttributes": [