diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 45772f3..5045007 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -41,7 +41,6 @@ jobs:
       - name: Composer install --no-progress --prefer-dist --optimize-autoloader
         run: |
           composer --version
-          composer require --dev phpunit/phpunit:"^9.5"
           if ${{ matrix.prefer-lowest == 'prefer-lowest' }}
           then
             composer update --prefer-lowest --prefer-stable