diff --git a/composer.json b/composer.json
index eb823ed..0dfba83 100644
--- a/composer.json
+++ b/composer.json
@@ -12,12 +12,12 @@
   "minimum-stability": "dev",
   "prefer-stable": true,
   "require": {
-    "php": "^7.1",
-    "psr/http-message": "^1.0@dev"
+    "php": "^7.1|^8.0",
+    "psr/http-message": "^1.0"
   },
   "require-dev": {
     "phpunit/phpunit": "^7.2",
-    "nyholm/psr7": "^1.0@dev",
+    "nyholm/psr7": "^1.3",
     "phan/phan": "^2.2"
   },
   "autoload": {