diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 0d8803c2f..7bfbec5f2 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -91,9 +91,9 @@ jobs:
           # PrestaShop 9.0.x supports PHP 8.1 up to 8.4 (8.5 is not supported)
           - { presta_version: '9.0.3', php_version: '8.1' }
           - { presta_version: '9.0.3', php_version: '8.4' }
-          # PrestaShop 9.1.x and develop support PHP 8.1 up to 8.5
-          - { presta_version: '9.1.x', php_version: '8.1' }
-          - { presta_version: '9.1.x', php_version: '8.5' }
+          # PrestaShop 9.1.x (pinned to the 9.1.4 tag) and develop support PHP 8.1 up to 8.5
+          - { presta_version: '9.1.4', php_version: '8.1' }
+          - { presta_version: '9.1.4', php_version: '8.5' }
           - { presta_version: 'develop', php_version: '8.1' }
           - { presta_version: 'develop', php_version: '8.5' }
       fail-fast: false
diff --git a/tests/php/phpstan/phpstan-9.1.x.neon b/tests/php/phpstan/phpstan-9.1.4.neon
similarity index 100%
rename from tests/php/phpstan/phpstan-9.1.x.neon
rename to tests/php/phpstan/phpstan-9.1.4.neon