diff --git a/Package.swift b/Package.swift
index 2716b72..de65603 100755
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.9
+// swift-tools-version: 6.0
 
 import PackageDescription
 
@@ -16,5 +16,6 @@ let package = Package(
     targets: [
         .target(name: "NaiveDate", path: "Sources"),
         .testTarget(name: "NaiveDateTests", dependencies: ["NaiveDate"], path: "Tests")
-    ]
+    ],
+    swiftLanguageModes: [.v6]
 )
diff --git a/Package@swift-5.9.swift b/Package@swift-5.9.swift
new file mode 100644
index 0000000..64748d1
--- /dev/null
+++ b/Package@swift-5.9.swift
@@ -0,0 +1,20 @@
+// swift-tools-version: 5.9
+
+import PackageDescription
+
+let package = Package(
+    name: "NaiveDate",
+    platforms: [
+        .macOS(.v10_15),
+        .iOS(.v13),
+        .tvOS(.v13),
+        .watchOS(.v6)
+    ],
+    products: [
+        .library(name: "NaiveDate", targets: ["NaiveDate"]),
+    ],
+    targets: [
+        .target(name: "NaiveDate", path: "Sources"),
+        .testTarget(name: "NaiveDateTests", dependencies: ["NaiveDate"], path: "Tests")
+    ],
+)