diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index c09f0dbc..a691559c 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -33,14 +33,6 @@ jobs:
                     php-version: ${{ matrix.php }}
                     coverage: none
 
-            -   name: Require phpunit 6 for php >= 7.0
-                if: matrix.php >= 7.0
-                run: COMPOSER_MEMORY_LIMIT=-1 composer require "phpunit/phpunit:6.*" --no-interaction --no-update
-
-            -   name: Require phpunit 9 for php >= 7.3
-                if: matrix.php >= 7.3
-                run: COMPOSER_MEMORY_LIMIT=-1 composer require "phpunit/phpunit:9.*" --no-interaction --no-update
-
             -   name: Install dependencies
                 run: COMPOSER_MEMORY_LIMIT=-1 composer update --${{ matrix.dependency-version }} --prefer-dist --no-interaction --no-suggest