diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 89dd1fb7..788294b2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,14 +10,13 @@ on:
 
 jobs:
   testsuite:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
-        php-version: ['7.2', '8.0']
+        php-version: ['7.2', '8.0', '8.1']
         prefer-lowest: ['']
         include:
-          - php-version: '8.1'
           - php-version: '7.2'
             prefer-lowest: 'prefer-lowest'
 
@@ -64,8 +63,6 @@ jobs:
       run: |
         if ${{ matrix.prefer-lowest == 'prefer-lowest' }}; then
           composer update --prefer-lowest --prefer-stable
-        elif ${{ matrix.php-version == '8.1' }}; then
-          composer update --ignore-platform-reqs
         else
           composer update
         fi