diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 35f4bfe..fc560c7 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -14,5 +14,6 @@ jobs:
     - uses: php-actions/phpunit@v3
       with:
         version: 7.5.20
+        php_version: 7.1
         bootstrap: tests/bootstrap.php
         configuration: phpunit.xml
\ No newline at end of file