diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 671a5a8..aedfa6a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -13,8 +13,8 @@ jobs:
     strategy:
       #for each of the following versions of PHP, with and without --prefer-lowest
       matrix:
-        php-versions: ['5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4']
-
+        php-versions: [ '7.2.5', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2' ]
+        composer-options: [ '', '--prefer-lowest' ]
     #set the name for each job
     name: PHP ${{ matrix.php-versions }}
     steps:
@@ -35,4 +35,14 @@ jobs:
 
       #run tests
       - name: Run test suite
-        run: vendor/bin/phpunit
\ No newline at end of file
+        run: vendor/bin/phpunit
+
+      #php 8.x requirements
+      - if: ${{ matrix.php-versions >= '8.0' && matrix.composer-options != '' }}
+        name: PHP 8.x
+        run: composer require --dev phpunit/phpunit "^9.5" --no-interaction --prefer-source --with-all-dependencies
+
+      #php 8.1+ requirements
+      - if: ${{ matrix.php-versions >= '8.1' && matrix.composer-options != '' }}
+        name: PHP 8.1+
+        run: composer require --dev guzzlehttp/guzzle "^7.4.5" --no-interaction --prefer-source --with-all-dependencies