diff --git a/.github/workflows/api-breakage.yml b/.github/workflows/api-breakage.yml
index 9d88f6e..ec650aa 100644
--- a/.github/workflows/api-breakage.yml
+++ b/.github/workflows/api-breakage.yml
@@ -10,7 +10,7 @@ jobs:
       image: swift:5.9
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         fetch-depth: 0
     # https://github.com/actions/checkout/issues/766
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a36d524..31f656a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,7 @@ jobs:
     timeout-minutes: 15
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
     - name: Install and run Mosquitto
       run: |
         brew install mosquitto
@@ -44,10 +44,10 @@ jobs:
     timeout-minutes: 15
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
     - name: Xcodebuild
       run: |
-        xcodebuild build -scheme mqtt-nio -destination 'platform=iOS Simulator,name=iPhone 11'
+        xcodebuild build -scheme mqtt-nio -destination 'platform=iOS Simulator,name=iPhone 16'
 
   linux:
     runs-on: ubuntu-latest
@@ -77,7 +77,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
     - name: Restart Mosquitto
       # The mosquitto service container is started *before* mqtt-nio is checked
       # out. Restarting the container after the checkout step is needed for the
diff --git a/.github/workflows/gen-docs.yml b/.github/workflows/gen-docs.yml
index 8f78945..41297e4 100644
--- a/.github/workflows/gen-docs.yml
+++ b/.github/workflows/gen-docs.yml
@@ -12,7 +12,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         fetch-depth: 0
     - name: Install Dependencies
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 434025a..25fa26e 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -12,7 +12,7 @@ jobs:
     timeout-minutes: 15
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         fetch-depth: 1
     - name: run script