diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7999ad0..9d31640 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -11,7 +11,10 @@ jobs:
             fail-fast: false
             matrix:
                 phpbb: ['3.3.x', 'master']
-                php: ['8.3', '8.4']
+                php: ['8.1', '8.3', '8.4']
+                exclude:
+                    - phpbb: 'master'
+                      php: '8.1'
         name: phpBB ${{ matrix.phpbb }} / PHP ${{ matrix.php }}
         steps:
             - name: Checkout phpBB