diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ababf77..24f9323 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,13 +5,17 @@ on:
 
 jobs:
   smoke-test:
-    runs-on: macos-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-14, macos-15, macos-26]
     steps:
-    - name: Checkout Repo
-      uses: actions/checkout@v4
+      - name: Checkout Repo
+        uses: actions/checkout@v4
 
-    - name: Build
-      run: swift build -v
+      - name: Build
+        run: swift build -v
 
-    - name: Run Smoke Test
-      run: swift run -v DictionaryKitExample
+      - name: Run Smoke Test
+        run: swift run -v DictionaryKitExample
diff --git a/Package.swift b/Package.swift
index 7d1df1f..d7ea7fa 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,9 +1,12 @@
-// swift-tools-version: 6.1
+// swift-tools-version: 5.4
 
 import PackageDescription
 
 let package = Package(
     name: "DictionaryKit",
+    platforms: [
+        .macOS(.v10_13)
+    ],
     products: [
         .library(
             name: "DictionaryKit",
@@ -12,7 +15,7 @@ let package = Package(
     ],
     targets: [
         .target(
-            name: "DictionaryKit",
+            name: "DictionaryKit"
         ),
         .executableTarget(
             name: "DictionaryKitExample",