diff --git a/composer.json b/composer.json
index e941d1e..a976a7e 100755
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         }
     ],
     "require": {
-        "php": "^7.2",
+        "php": "^7.4|^8.0",
         "bitwasp/bitcoin": "^1.0",
         "kodekeep/binary": "^1.0",
         "kodekeep/bytebuffer": "^1.0",