diff --git a/composer.json b/composer.json
index 48a5632..eec84b0 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,10 @@
     "prefer-stable": true,
     "config": {
         "preferred-install": "dist",
-        "autoloader-suffix": "Drupal8"
+        "autoloader-suffix": "Drupal8",
+        "platform": {
+            "php": "5.5.9"
+        }
     },
     "extra": {
         "_readme": [
diff --git a/composer.lock b/composer.lock
index da9771e..9ce9659 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "ccaaa31c7fb3423dca36316975b292cb",
+    "content-hash": "ace1adb9ae37e0033395e4414fc7f938",
     "packages": [
         {
             "name": "asm89/stack-cors",
@@ -4318,5 +4318,8 @@
     "platform": {
         "php": ">=5.5.9"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "platform-overrides": {
+        "php": "5.5.9"
+    }
 }