diff --git a/.github/workflows/phpspec-task.yml b/.github/workflows/phpspec-task.yml
index 29eff6e..0f66f36 100644
--- a/.github/workflows/phpspec-task.yml
+++ b/.github/workflows/phpspec-task.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ${{ matrix.operating-system }}
     strategy:
       matrix:
-        operating-system: [ ubuntu-18.04 ]
+        operating-system: [ ubuntu-20.04 ]
         php-versions: ['8.0.12', '8.1', '8.2', '8.3' ]
     name: Evaluate Behavior, ${{ matrix.php-versions }} on ${{ matrix.operating-system }}
     steps: