diff --git a/composer.json b/composer.json
index 4d79401c8..e3671ca53 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         "drush/drush": "^10|^11|^12",
         "symfony/yaml": "^3|^4|^5|^6",
         "twig/twig": "^2|^3",
-        "vlucas/phpdotenv": "^4|^5",
+        "vlucas/phpdotenv": "5.6.0",
         "ext-json": "*"
     },
     "require-dev": {