diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 68175ff..0113e37 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -9,7 +9,7 @@ on:
 
 jobs:
   RunUnitTests:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - name: Install Dependencies with Apt Get