diff --git a/Sources/Packages/Package.swift b/Sources/Packages/Package.swift
index 9fa196a..4c38227 100644
--- a/Sources/Packages/Package.swift
+++ b/Sources/Packages/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
@@ -34,27 +34,27 @@ let package = Package(
         .target(
             name: "SecretKit",
             dependencies: [],
-            swiftSettings: [.unsafeFlags(["-warnings-as-errors"])]
+            swiftSettings: swiftSettings
         ),
         .testTarget(
             name: "SecretKitTests",
             dependencies: ["SecretKit", "SecureEnclaveSecretKit", "SmartCardSecretKit"],
-            swiftSettings: [.unsafeFlags(["-warnings-as-errors"])]
+            swiftSettings: swiftSettings
         ),
         .target(
             name: "SecureEnclaveSecretKit",
             dependencies: ["SecretKit"],
-            swiftSettings: [.unsafeFlags(["-warnings-as-errors"])]
+            swiftSettings: swiftSettings
         ),
         .target(
             name: "SmartCardSecretKit",
             dependencies: ["SecretKit"],
-            swiftSettings: [.unsafeFlags(["-warnings-as-errors"])]
+            swiftSettings: swiftSettings
         ),
         .target(
             name: "SecretAgentKit",
             dependencies: ["SecretKit", "SecretAgentKitHeaders"],
-            swiftSettings: [.unsafeFlags(["-warnings-as-errors"])]
+            swiftSettings: swiftSettings
         ),
         .systemLibrary(
             name: "SecretAgentKitHeaders"
@@ -73,3 +73,10 @@ let package = Package(
         ),
     ]
 )
+
+var swiftSettings: [PackageDescription.SwiftSetting] {
+    [
+        .swiftLanguageMode(.v6),
+        .unsafeFlags(["-warnings-as-errors"])
+    ]
+}
diff --git a/Sources/Secretive.xcodeproj/project.pbxproj b/Sources/Secretive.xcodeproj/project.pbxproj
index 1edd651..72a1b3a 100644
--- a/Sources/Secretive.xcodeproj/project.pbxproj
+++ b/Sources/Secretive.xcodeproj/project.pbxproj
@@ -621,6 +621,7 @@
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_EMIT_LOC_STRINGS = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 6.0;
 			};
 			name = Debug;
 		};
@@ -680,6 +681,7 @@
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_EMIT_LOC_STRINGS = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				SWIFT_VERSION = 6.0;
 			};
 			name = Release;
 		};
@@ -707,7 +709,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.maxgoedjen.Secretive.Host;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
-				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;
 		};
@@ -735,7 +736,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.maxgoedjen.Secretive.Host;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "Secretive - Host";
-				SWIFT_VERSION = 5.0;
 			};
 			name = Release;
 		};
@@ -755,7 +755,6 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.maxgoedjen.SecretiveTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 5.0;
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Secretive.app/Contents/MacOS/Secretive";
 			};
 			name = Debug;
@@ -776,7 +775,6 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.maxgoedjen.SecretiveTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 5.0;
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Secretive.app/Contents/MacOS/Secretive";
 			};
 			name = Release;
@@ -844,6 +842,7 @@
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_EMIT_LOC_STRINGS = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 6.0;
 			};
 			name = Test;
 		};
@@ -867,7 +866,6 @@
 				MARKETING_VERSION = 1;
 				PRODUCT_BUNDLE_IDENTIFIER = com.maxgoedjen.Secretive.Host;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 5.0;
 			};
 			name = Test;
 		};
@@ -888,7 +886,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.maxgoedjen.SecretiveTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
-				SWIFT_VERSION = 5.0;
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Secretive.app/Contents/MacOS/Secretive";
 			};
 			name = Test;
@@ -911,7 +908,6 @@
 				MARKETING_VERSION = 1;
 				PRODUCT_BUNDLE_IDENTIFIER = com.maxgoedjen.Secretive.SecretAgent;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 5.0;
 			};
 			name = Test;
 		};
@@ -935,7 +931,6 @@
 				MARKETING_VERSION = 1;
 				PRODUCT_BUNDLE_IDENTIFIER = com.maxgoedjen.Secretive.SecretAgent;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;
 		};
@@ -961,7 +956,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.maxgoedjen.Secretive.SecretAgent;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "Secretive - Secret Agent";
-				SWIFT_VERSION = 5.0;
 			};
 			name = Release;
 		};