diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index bc5334b..6aad07c 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -23,6 +23,7 @@ jobs:
         php-version:
           - "7.4"
           - "8.0"
+          - "8.1"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/composer.json b/composer.json
index 3a95ccd..b12c05a 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
     "prefer-stable": true,
     "minimum-stability": "dev",
     "require": {
-        "php": ">=7.4.2",
+        "php": "^7.4.2 || ^8.0 || ^8.1",
         "aeon-php/calendar": ">=0.14.0",
         "aeon-php/sleep": ">=0.6.0"
     },