diff --git a/.travis.yml b/.travis.yml
index 5d7f047..4f60f2b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,13 +7,14 @@ php:
     - '7.2'
     - '7.3'
     - '7.4'
+    - '8.0'
 
 before_install:
     - mkdir -p build/logs
 
 install:
     - composer self-update --ansi --no-interaction
-    - composer install --ansi --no-interaction --no-suggest
+    - composer install --ansi --no-interaction
 
 before_script:
     - vendor/bin/phpstan analyse --ansi --no-progress
diff --git a/composer.json b/composer.json
index d612491..b9312f4 100644
--- a/composer.json
+++ b/composer.json
@@ -26,12 +26,12 @@
         "sort-packages": true
     },
     "require": {
-        "php": "^7.1"
+        "php": "^7.1|^8.0"
     },
     "require-dev": {
         "phpstan/phpstan": "^0.12.37",
         "phpunit/phpunit": "^7.3 || ^8.0 || ^9.0",
-        "vimeo/psalm": "^3.13"
+        "vimeo/psalm": "^3.13|^4.3"
     },
     "autoload": {
         "psr-4": {