diff --git a/composer.json b/composer.json
index 67640de8..3cd30e51 100644
--- a/composer.json
+++ b/composer.json
@@ -79,6 +79,9 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "config": {
+        "platform": {
+            "php": "7.4.0"
+        },
         "sort-packages": true,
         "optimize-autoloader": true,
         "allow-plugins": {