diff --git a/.travis.yml b/.travis.yml
index 8855bac..e8e9767 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,8 +2,9 @@ language: php
 dist: trusty
 
 php:
-  - '7.2'
-  - '7.3'
+  - '7.4'
+  - '8.0'
+  - '8.1'
 
 before_script:
   - travis_retry composer self-update
diff --git a/composer.json b/composer.json
index ae10ee3..fcca784 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
   "minimum-stability": "dev",
   "prefer-stable": true,
   "require": {
-    "php": "7.4 - 8.0",
+    "php": "^7.4 || ^8.0",
     "ext-mbstring": "*"
   },
   "require-dev": {