diff --git a/.travis.yml b/.travis.yml
index 3c00cb0..9cb0069 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ php:
   - 7.2
   - 7.3
   - 7.4
+  - nightly
 
 before_install:
   - mv ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini{,.disabled} || echo "xdebug not available"
diff --git a/composer.json b/composer.json
index 9937200..3f23857 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-        "php": "^7.1"
+        "php": "^7.1 || ^8.0"
     },
     "require-dev": {
         "ext-phar":                  "*",