diff --git a/.github/workflows/dotnet-core.yml b/.github/workflows/dotnet-core.yml
index f0812b9..717fe12 100644
--- a/.github/workflows/dotnet-core.yml
+++ b/.github/workflows/dotnet-core.yml
@@ -10,13 +10,17 @@ jobs:
   build:
 
     runs-on: ubuntu-latest
-
+    
     steps:
     - uses: actions/checkout@v2
-    - name: Setup .NET Core
+    - name: Setup .NET Core 3.1
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: '3.1.x'
+    - name: Setup .NET 5.0
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 3.1.301
+        dotnet-version: '5.0'
     - name: Install dependencies
       run: dotnet restore
       working-directory: Kryptos