diff --git a/.github/workflows/php-workflow.yml b/.github/workflows/php-workflow.yml
index b7be09a7..fe8a9d6b 100644
--- a/.github/workflows/php-workflow.yml
+++ b/.github/workflows/php-workflow.yml
@@ -65,7 +65,7 @@ jobs:
 
             - name: Composer Update
               run: |
-                composer require "phpunit/phpunit:$phpunit_version" --no-update --dev
+                COMPOSER require "phpunit/phpunit:${{env.PHPUNIT_VERSION}}" --no-update --dev
                 composer update --prefer-dist
 
             - name: Unit Testing