diff --git a/composer.json b/composer.json
index 8ff15c07..c57ff4d3 100644
--- a/composer.json
+++ b/composer.json
@@ -29,10 +29,10 @@
     }
   },
   "require": {
-    "php": ">=5.5.0"
+    "php": "5.5 - 8.0"
   },
   "require-dev": {
-    "php": ">=5.5.0",
+    "php": "5.5 - 8.0",
     "phpunit/phpunit": "5.* || 8.*",
     "php-coveralls/php-coveralls": "2.*",
     "squizlabs/php_codesniffer": "3.*",