diff --git a/.travis.yml b/.travis.yml
index f11c45e26..14682ae24 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,6 +12,9 @@ env:
 matrix:
   include:
     - php: 7.4
+    - php: nightly
+  allow_failures:
+    - php: nightly
 
 before_install:
   - pecl channel-update pecl.php.net
diff --git a/composer.json b/composer.json
index 6fe644fb1..c7f140ef9 100644
--- a/composer.json
+++ b/composer.json
@@ -24,13 +24,13 @@
 		}
 	],
 	"require": {
-		"php": "^7.4",
+		"php": "^7.4 || ^8.0",
 		"ext-mbstring": "*",
-		"chillerlan/php-settings-container": "^2.0"
+		"chillerlan/php-settings-container": "^2.1"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "^9.2",
-		"phan/phan": "^3.0",
+		"phpunit/phpunit": "^9.4",
+		"phan/phan": "^3.2.2",
 		"setasign/fpdf": "^1.8.2"
 	},
 	"suggest": {