.github/workflows/pull_request.yml in osut-0.2.0 vs .github/workflows/pull_request.yml in osut-0.2.1

@@ -37,11 +37,11 @@
         docker exec -t test ls
         docker exec -t test bundle update
         docker exec -t test bundle exec rake
         docker kill test
   test_330x:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
     - name: Check out repository
       uses: actions/checkout@v2
     - name: Run Tests
       run: |
@@ -53,10 +53,10 @@
         docker exec -t test ls
         docker exec -t test bundle update
         docker exec -t test bundle exec rake
         docker kill test
   test_340x:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
     - name: Check out repository
       uses: actions/checkout@v2
     - name: Run Tests
       run: |