diff --git a/composer.json b/composer.json
index ba2cc55..aabf72c 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         }
     ],
     "require": {
-        "php": "^7.1 || ^8.0"
+        "php": "~7.1.0 || ~7.2.0 || ~7.3.0 || ~7.4.0 || ~8.0.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^7.5 || ^8.0",