diff --git a/.github/workflows/payplug-ci.yml b/.github/workflows/payplug-ci.yml
index 067397c..0c8022b 100644
--- a/.github/workflows/payplug-ci.yml
+++ b/.github/workflows/payplug-ci.yml
@@ -18,16 +18,15 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-versions: ['7.3', '7.4', '8.0','8.1']
-        phpunit-versions:
-          - '8.5.15'
-          - '9.0'
-
+        php-versions: ['7.3', '7.4', '8.0', '8.1']
+        phpunit-versions: ['8.5.15']
         include:
         - php-versions: '5.6'
           phpunit-versions: '5.7.27'
         - php-versions: '7.0'
           phpunit-versions: '6.5.14'
+        - php-version: '8.1'
+          phpunit-versions: '9.5.10'
 
     
     name: Php Version ${{matrix.php-versions }} / php Unit ${{ matrix.phpunit-versions }}
@@ -42,6 +41,9 @@ jobs:
     - name: php version
       run: php -v
 
+    - name: Install Composer dependencies
+        run: composer install
+
     - name: Run test suite
       run: phpunit --bootstrap tests/config.php tests --configuration tests/phpunit.xml