diff --git a/composer.json b/composer.json
index 7294446..fd528a7 100644
--- a/composer.json
+++ b/composer.json
@@ -11,14 +11,15 @@
         }
     ],
     "config": {
-        "platform": {"php": "5.6"}
+        "platform": {"php": "7.4"}
     },
     "minimum-stability": "alpha",
     "require": {
-        "php": ">=5.5"
+        "php": ">=5.5",
+        "ext-awscrt": "*"
     },
     "require-dev": {
-        "phpunit/phpunit":"^4.8.35|^5.6.3"
+        "phpunit/phpunit":"^5.6.3"
     },
     "autoload": {
         "classmap": [