diff --git a/.github/actions/build/action.yml b/.github/actions/build/action.yml
index 2747b42..494bfb0 100644
--- a/.github/actions/build/action.yml
+++ b/.github/actions/build/action.yml
@@ -25,14 +25,16 @@ runs:
     # https://devblogs.microsoft.com/dotnet/dotnet-loves-github-actions/
     # https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-net#caching-dependencies
     - name: Cache NuGet Packages
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       if: success()
       with:
         path: ~/.nuget/packages
         key: ${{ runner.os }}-dotnet-nuget
 
     - name: Setup .NET
-      uses: actions/setup-dotnet@v3
+      uses: actions/setup-dotnet@v4
+      with:
+         dotnet-version: '9.x.x'      
 
       # https://learn.microsoft.com/en-us/dotnet/core/tools/global-tools
     - name: Restore .NET Tools
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9d5d095..fd35f60 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Build and Test Flight
         uses: ./.github/actions/build-test