diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7e7ba6f..33890b7 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -9,20 +9,31 @@ on:
 jobs:
   mac-os:
     name: macOS
-    runs-on: macos-11
+    runs-on: macos-14
     steps:
-    - uses: actions/checkout@v2
-    - name: Build
-      run: swift build -c release -v
-    - name: Test
-      run: swift test -c release -v
+      - uses: actions/checkout@v2
+      - name: Set up Xcode 15
+        uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: '15'
+      - name: Build for macOS
+        run: swift build -c release -v
+      - name: Test for macOS
+        run: swift test -c release -v
+      - name: Set up iOS Simulator
+        run: |
+          xcrun simctl boot "iPhone 15 Pro"
+      - name: Build for iOS
+        run: xcodebuild -destination 'platform=iOS Simulator,name=iPhone 15 Pro' -scheme swift-ymd build
+      - name: Test on iOS Simulator
+        run: xcodebuild -destination 'platform=iOS Simulator,name=iPhone 15 Pro' -scheme swift-ymd test
+
   linux:
     name: Linux
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v2
-    - name: Build
-      run: swift build -c release -v
-    - name: Test
-      run: swift test -c release -v
-
+      - uses: actions/checkout@v2
+      - name: Build for Linux
+        run: swift build -c release -v
+      - name: Test for Linux
+        run: swift test -c release -v