diff --git a/build/composer.json b/build/composer.json
index 1463f06d5..4273a3036 100644
--- a/build/composer.json
+++ b/build/composer.json
@@ -13,6 +13,9 @@
         "leafo/scssphp": "dev-master"
     },
     "config": {
-        "github-protocols": ["https"]
+        "github-protocols": ["https"],
+        "platform": {
+            "php": "7.4"
+        }
     }
 }