diff --git a/composer.json b/composer.json
index 8f86b81..9ddce56 100644
--- a/composer.json
+++ b/composer.json
@@ -53,7 +53,7 @@
     ],
     "minimum-stability": "stable",
     "require": {
-        "php": ">=7.1",
+        "php": "^7.1 || ^7.2",
         "guzzlehttp/guzzle": "^6.3",
         "psr/simple-cache": "^1.0"
     },